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Should I Fix My Octopus Energy Tariff Because of the War in Iran, or should I stay on the Energy Price Cap?

When the Iran war kicked off on the 1st March 2026, I, like many households, started thinking about energy bills and what might be coming.

I am just a geeky mum trying to keep my bills down, and I overthink these things. Events like this can ripple through oil, gas, and electricity prices and even affect food, transport, and interest rates, making household budgets feel tighter.

I hope this post helps you make sense of your Octopus Energy options, shows what protections are in place, and guides you through the choices so you can feel more in control. Always check the Octopus Energy website for the most up-to-date information before making a decision.

By Sarah Chambers

This website is run independently by an Octopus customer and is not part of Octopus Energy. This article reflects my own views and experience. I may receive a reward if you switch using my referral link. For the latest official information on tariffs, eligibility and terms, please visit the Octopus Energy website.

Updated: 23rd March 2026

Existing customer? Find out how you can benefit too. T&Cs apply (only one switching offer per household)

Why Some Households Are Fixing Tariffs Early

Many households are reviewing their tariffs right now. Some are on flexible plans, others on fixed tariffs, and some have smart tariffs for electric vehicles or heat pumps.

The main concern is winter. Even if your tariff does not expire until the colder months, global events can affect energy prices before renewal. Fixing a tariff now can give certainty for winter, while staying flexible lets you benefit if rates drop. At the moment, though, that feels like a distant dream. The Octopus Flexible tariff does offer the option to swap tariffs if prices fall, with no exit fees, which is a useful safety net.

In my household, I decided to refix my gas tariff early as an example. Many families I know are reviewing their energy options, too. The principle is the same for any household—taking action early can help manage winter bills and give peace of mind.

Why the Iran Conflict Matters for Energy Prices

The Strait of Hormuz is a key route for oil tankers. If tankers are delayed or blocked, global supply tightens, and prices rise. At the moment, it is a real mess, and this is exactly why oil and gas prices are climbing. However, there might be a glimmer of hope on the horizon if President Trump’s recent posts on the social media platform X are to be believed.

If a resolution is agreed as suggested by President Trump, then maybe oil will start to flow more freely again, and there will be less stress on global demand, but I fear that even if there is resultion so much damage has been done that it may take months for prices to go back down. It isn’t as easy as flicking on a switch to restart oil production.

Why does the war matter to energy bills in the UK?

Sadly, electricity is linked to gas, so rising gas prices also affect all households, even those that use only electricity. It also affects food production and transport, to name just a few.

Energy bills may not jump overnight, but it is the kind of global event that households need to keep an eye on. Watching the news can feel stressful, and I shudder at the thought of this going on further. With the world already in such a delicate state, another conflict does nothing for stability.

Ofgem is continuously monitoring wholesale energy prices to set the next Energy Price Cap. We already know the rates for April to 30th June 2026, but they are now working on prices for 1st July to 30th September 2026, and the outlook is not the easiest to read.

Analysts also track prices so they can predict what Ofgem might do. Since the start of the war in Iran, predictions for the Energy Price Cap in both July and October 2026 have risen. I am less concerned about July, but unless the situation changes, we may not see the downward movement in prices that households need as we head into October 2026.

These figures are taken from the average predictions from EDF, British Gas and E.on Next’s Price Cap Forecasting Services on the 16th March 2026.

If You Haven’t Fixed Yet, What Should You Do?

For now, there is some protection. Households on the Octopus Flexible tariff benefit from the Energy Price Cap, which keeps rates calculated before the Iran conflict in place until the end of June.

You might be wondering if you should wait to fix your tariff until after 1st April, since prices are dropping. The answer is no. While rates on all tariffs will show a reduction, this is not because energy is suddenly cheaper. The government is removing some costs from energy bills and shifting them into taxation instead. That means your actual energy use is still exposed to global price changes. Fixing now can still give certainty for the colder months.

The next price cap period will run from 1st July to 30th September, and Ofgem will announce the new rates by the end of May. Predictions are showing an 16% increase by the time we get to October.  If the war ends, then this will change. It is the uncertainty that is worrying, not for the summer but for the start of winter.

Because energy prices change frequently, this is time-sensitive. Today is the 18th March, and I have not quoted prices. Always refer to the Octopus Energy website before making a decision about fixing or switching tariffs.

The Octopus Fixed is now for 10 months with a £50 exit fee per fuel type instead of £75 exit fee per fuel type. (Quoted in the TikTok below)

@sarah_go_green What should you do? @Octopus Energy fixed v flexible. #energypricesuk #energybills ♬ original sound – sarah_go_green

Why Summer Gives Some Temporary Relief

Even if energy prices rise from 1st July, summer usage patterns make it easier to manage bills.

Longer days mean less need for lighting. Heating is largely off. Cooler showers and warmer temperatures reduce electricity use.

This does not remove the risk. It simply gives households a little breathing room before winter arrives.

Why Winter Is the Real Concern

The bigger challenge is from 1st October onwards, when energy use increases.

Even if the conflict ends quickly, oil and gas prices may not fall immediately. Energy markets tend to rise quickly but fall slowly. Electricity prices are linked to gas, so rising gas costs can affect most households.

This is when bills can really feel the impact, and being prepared is important.

Should You Fix or Stay on the Flexible Tariff?

There is no single right answer. Households can choose based on their own energy use, finances, and what makes sense to them right now.

Stay on the Flexible Tariff

You benefit from the current Energy Price Cap, which protects your rates until the end of June. This allows you to monitor what happens in global energy markets before making a longer-term decision.

Fix Your Tariff Now

You can lock in rates today.

Standard fixed tariffs are usually 12 months, and some smart tariffs for EVs or heat pumps offer the same.

The catch is exit fees. If prices drop later, you may have to pay to leave the tariff. If prices rise, you will be glad you secured a fixed rate.

Even if your home does not have solar panels or an EV, the principle is the same. Review your usage, check available tariffs, and decide whether fixing or staying flexible works best for your household.

Options for Electric Vehicle and Smart Tariffs

For households with an EV or heat pump, smart tariffs can help take advantage of off-peak electricity rates.

Rates and durations vary, so it is important to check the Octopus Energy website for the latest information. This ensures you are making a decision based on current prices and availability.

Why Octopus Energy Makes a Difference

Not all suppliers continue offering fixed tariffs during uncertain times. Octopus still gives households a choice, which is valuable.

You can decide what works best for your home and your finances. Having the option to fix a tariff now or stay flexible matters, especially with winter approaching.

Frequently Asked Questions

Will the Iran war immediately increase UK energy bills?
No. Current prices are protected by the Energy Price Cap until the end of June. Any changes would most likely appear in future price cap calculations.

When will we know if bills will increase?
Ofgem will announce the next price cap in late May, which applies from 1st July to 30th September.

Should I fix my energy tariff now?
It depends on your household, finances, and appetite for risk. Fixing provides certainty, staying flexible allows you to benefit if prices fall.

Is electricity affected by gas prices?
Yes. Electricity in the UK is linked to gas generation, so rising gas costs affect most households.

Are fixed tariffs risky?
They can be. Exit fees apply, so if prices drop, you may be locked in unless you pay to leave.

Is Octopus still offering fixed tariffs?
Yes. They continue to offer fixed options, giving customers the choice to protect their bills if they wish.

Tesla UK Referral Link 2025

Tesla is currently offering UK buyers either 650 free Supercharging miles (for Model 3/Y) or £500 off your new Model S/X, and it all starts with a Tesla referral link. In this guide, I’ll walk you through exactly how the Tesla UK referral programme works, which models qualify, and why clicking my Tesla referral link lets you claim the deal instantly.

How the Tesla Referral Scheme works in the UK.

If you are lucky enough to be an existing Tesla owner in the UK, you can share your Tesla Referral Link or code and earn Tesla credits. The person you refer will get a £500 discount on a new Tesla Model X or S or 650 free Tesla Supercharging miles today on either the Tesla Model Y or Model 3.

The details will pop up on their order screen as soon as they have clicked your Tesla referral link. It is important to note that the discount can change at any time. This current Tesla UK referral offer was updated on the 5th June 2025 to include the new Tesla Model Y and still active.

Tesla Referral Discount 2025 – October 2025 Update

Here’s what you can get right now when you use a Tesla referral link to order your new Tesla in the UK:

✅ £500 off a new Tesla Model X or Tesla Model S
✅ 650 free Supercharging miles with a new Model 3 or Model Y
🌟 New from June 2025 (and still the most up-to-date Tesla offer): The new refreshed Model Y, previously excluded, now qualifies for the 650 free miles!

Tesla referral rewards change throughout the year based on sales targets. Since the start of the year, they’ve ranged from £250 to £750 as a referral credit. Here I have listed the latest offers, which include both free miles and credits depending on the model of Tesla being purchased.

Charge into Rewards with a Tesla discount code in 2025.

Word travels fast when you’re passionate about something because nothing speaks louder than a personal recommendation. That’s why Tesla doesn’t pay for advertising. Instead, they incentivise customers to share their experiences and Tesla referral codes.

The Tesla referral scheme was updated in June 2025, and now it includes a Tesla Referral Reward in the UK for the new Tesla Model Y.

Buying a new Tesla Model Y or Model 3 in the UK.

• If you buy a new Tesla Model Y  or any Model 3 using a Tesla referral, you will get 650 free Supercharging miles.
• If you buy a new Tesla Model S or Model X using a Tesla referral, you will get a £500 discount.

Tesla Referral Rewards.

• If you refer someone who buys a Tesla Model Y or Model 3 you will get 650 free Tesla Supercharging miles.
• If you refer someone who buys a Tesla Model S or Model X you will get £250 in Tesla credits. (This can be exchanged for Supercharging miles. software upgrades, merchandise, service payments or discounts off a new Tesla. )

If you buy any Tesla vehicle or solar PV outside of the UK.

If you are outside of the UK you can also use my Tesla Referral Code to purchase your new Tesla or a Solar Roof in a country where Tesla accepts orders. The Tesla referral rewards credits may vary from country to country. You need to change your location on the Tesla website when you click through, as you will land on the UK version of the Tesla website using my Tesla Referral Link. 🇬🇧

How to use my Tesla Referral Link?

When you buy a new Tesla Model 3, Model Y, Model S or Model X using my referral link, we will either get a discount on your new Tesla or free supercharging miles, and I will earn Tesla Referral credits. 💚

To purchase with my referral link:

1. Click on my Tesla referral link.
2. Purchase your new Tesla via the referral link.
3. Tesla will discount your new Tesla.

• Claim 65o free Tesla Supercharging miles when you order a Tesla Model 3 – Referral Link (650 free Tesla supercharging miles.)
• Claim 650 free supercharging miles when ordering a Tesla Model Y (including the refresh) – Referral Link (650 free Tesla Supercharging miles.)
• Claim your Tesla Model S discount. – Referral Link (£500 discount.)
• Claim your Tesla Model X discount. – Referral Link. (£500 discount.)

If you buy a new Tesla you will receive a £500 discount or get 650 free supercharging, depending on the model you buy. If you refer someone and they buy or lease a new Tesla £250 credit (previously known as loot point credit) will be allocated to your Tesla account. Once you have your own account, you can start referring people too so you can build up your credit.

Check out the Tesla Inventory because there may be vehicles ready to be collected now. Just enter your postcode.

If you are outside the UK you can simply switch to an alternative country on the Tesla website and still claim a discount on a new Tesla or you can just use my Tesla referral code Sarah583995 anywhere in the world.

Can I use a Tesla referral code at a Tesla showroom?

Yes, you can use a Tesla Referral discount code at a Tesla showroom. If you buy a new Tesla in-store just give the Sales advisor my Tesla discount code, Sarah583995.

Can you add a Tesla referral code after placing an order?

Tesla doesn’t allow you to add the referral code after you have placed the order. You can read the full terms of the Tesla referral scheme on their website.

How easy is it to buy a Tesla online?

I bought my Tesla Model Y online and both the ordering and collection were amazing. It was so straightforward and required almost no human contact. I can highly recommend a Tesla, it just keeps getting better with over-the-air updates.

🔥 Click here to apply my Tesla referral link and get up to 650 in free Tesla Supercharging miles when ordering any Tesla Model Y – updated June 2025!

How do I get a Tesla Referral Link?

If you own a Tesla, to find your Tesla referral link, just go into your Tesla app.

• Click on the icon that looks like a cube next to your profile picture in the top right-hand corner. The Tesla Referral Rewards will then appear on the screen.
• Tap the blue button at the bottom of the screen to share your Tesla Referral link. You can share your Tesla Referral link directly in a text message or email from this screen.
• The Tesla Referral Rewards section of the Tesla app will also show you the number of will credits you have and allow you to exchange your look credits for Tesla goodies.

How do I check how many Tesla Referral Credits I have?

When someone has bought a new Tesla using your Tesla discount code you can access and redeem the credits in your Tesla app.

• In the top right-hand corner click on the Tesla the three lines in the top right of the screen.
• Click on your profile image and then click “wallet”.
• From here you can view your Tesla referral credits.

• The Tesla Referral credits will show as pending in your referral history on the app until the new Tesla is delivered.
• On collection/delivery day the referring Tesla owner will have an update in their Tesla app and the credits will show are available to redeem.
• Tesla credits are valid for 12 months. (Once redeemed, Tesla Supercharging miles are usually valid for 6 months.)

What can I exchange my Tesla Referral Reward Credits for?

Tesla Supercharging miles are the obvious way to spend your Tesla referral credits. There’s something quite exciting about fueling your Tesla for free!

You can also exchange your Tesla credits for a variety of lifestyle products, Tesla accessories, software updates and servicing.

How to use Tesla Referral Credits.

Ensure your Tesla app is always updated to the latest version to access all features related to managing and using your credits. New updates might introduce better ways to use your credits or improve the user interface.

This is how to spend Tesla Referral Credits 2025.

You can spend your Tesla referral credits in 5 ways:

1. Tesla Shop: When you’re ready to check out in the Tesla Shop, you’ll see a drop-down box on the final checkout page. Here, you can select “Tesla credits” as your main payment card to pay for items.
2. Supercharging: To use credits for Supercharging, open your Tesla app and click the three lines (menu) in the top right-hand corner. Navigate to “Charging”. On the next page, you’ll have the option to select Tesla credits as your main payment card for charging sessions.
3. Software Upgrades: In your Tesla app, go to “Upgrades” and then select “Software”. Choose the software upgrade you want, add it to your cart, and proceed to checkout. You’ll need to confirm your billing address. At the payment step, you’ll be prompted to choose a payment method; here, you can select Tesla credits.
4. New Vehicle Purchase: You cannot use Tesla credits immediately when ordering a new vehicle. You must wait until you receive the final payment invoice. Only at this stage will you have the option to apply your Tesla credits towards the deposit.
5. Vehicle Servicing: For servicing, Tesla credits can only be used after the service is completed. Once your vehicle is ready for collection, you’ll be asked to confirm the cost. At this point, you can choose Tesla credits as your payment method. Note that you cannot select this option on the estimate page before the service is done.

Important Note: You cannot set Tesla credits as the default payment method in your Tesla wallet. Each of these services requires you to select Tesla credits manually during the specific transaction process.

@sarah_go_green How to use referral credits to pay for items in the Tesla app. These include; Tesla Products Tesla software. Tesla New vehicle Tesla supercharging Tesla shop. #teslahowto #teslatok ♬ original sound – sarah_go_green

This is what Tesla UK have to say about their new Tesla Referral Credits.

Our goal is to help Tesla owners share their passion for Tesla’s products and our mission — to accelerate the world’s transition to sustainable energy. As an owner, every time you bring a new friend or family member into the Tesla community, you and your friend both earn credits — you earn Referral Credits and your friend gets a discount on a new Tesla.

Is the Tesla Referral Scheme still active in the UK?

Yes, the Tesla referral scheme is still available in the UK in 2025.

This is how the Tesla referral scheme has changed over the last year;

• April 2024: Tesla suspended its Referral Scheme.
• 5th September 2024: The scheme was relaunched in the UK.
• 27th November 2024: Terms updated; new customers get either a £500 discount on a new Tesla or £500 credit for supercharging or accessories on lease deals when using a referral link.
• 1st January 2025: Rewards for referrers reduced to £250, but the £500 discount for new buyers remains.
• 5th June 2025: Rewards for referrers rain at £25o, but the new Tesla Model Y is now included in the UK Tesla Referral Scheme with 650 free supercharging miles being offered for a Tesla Model Y or Model 3. The £500 discount now only applies to the Model X and S.

Finding your Tesla VIN number early.

At the moment this isn’t so much of an issue as there is stock available but if you order a new Tesla and want to find out when it is on its way from the factory you can check for a VIN number. Once this is allocated to your Tesla account it means it’s on the ship heading to the UK.

I highly recommend this Tesla VIN Code Extension which can be used on a Chrome browser because it worked for me. It searches your Tesla account and finds the VIN in the source code even before it is openly displayed.

Tesla Optional Extras are they worth it?

There are some things you cannot retrospectively add after your Tesla purchase. These are obvious extras like the paint colour, although you can change it in your order before your delivery date. I changed my colour choice from red, to white and back to red again after I had placed my order.

You can, however, add the tow bar and the software upgrades anytime after your purchase.  The software updates are very easy to do.

Remember your vehicle will keep getting better as software changes are made. Over the last 3 years, the visualisation of the Tesla screen has changed so much. It is the reason why I chose a Tesla.

Is it worth buying Enhanced Autopilot when I order my Tesla?

In my view, unless you have read about the extra features of Enhanced Autopilot and want it straight out of the box on collection day, I would wait before ordering It in the UK.

I picked up my Tesla Model Y on the first day it was available in the UK and have driven it thousands of miles on the free autopilot, and it works a treat. I drove my Tesla from Berlin to Dunkirk in one day, and it helped reduce the fatigue whilst driving, as some of the pressures of driving are taken away by the vehicle’s software.

@sarah_go_green Replying to @Matt Lots of questions answered about #tesla Ehanced Autopilot. #teslatok ♬ original sound – sarah_go_green

If you try out the Tesla free autopilot, want the additional benefits, like lane changing, and find self-parking attractive, you can add the enhanced autopilot at any time for £3,400. The vehicle automatically updates the software.

You can also use Tesla referral credits to pay for software updates if you get enough. Look out for promotions where the referring fee increases meaning you need fewer Tesla referrals to reach that goal.

Ready, Set, Tesla – Collection Day.

There was a storm the day I picked up my Tesla Model Y and I was extremely nervous. I used this app to run through everything I needed to check but due to the rain, I skimmed through the list. It is important to remember that you have 72 hours to report any issues to Tesla and even return the vehicle if you feel it is necessary.

Handover of your new Tesla involves minimal human contact (which I like) so it is helpful if you do some prep if you have never driven an EV or test-driven a Tesla.

I found watching walk-through videos on the Tesla website before collection helpful and after I attended a free Zoom online orientation which is still being offered by volunteers at Tesla Owners UK.

Tesla Owners UK don’t put any pressure on you to sign up and you don’t need to be a member to attend the online event. I had my camera off, listened, and asked a few questions in the chat box. The session was very useful. Keep an eye on the Tesla Owners UK website for future dates.

If you would like any further hints or tips, just take a look at my TikTok Channel. You can also message me via DM on Twitter or TokTok plus you’ll find me at SarahGoGreen.com.

The first 3 things to do as soon as you have collected your new Tesla.

I have been playing TikTok mainly to annoy my daughters. What could Mummy possibly have to say?  Well, here are my tips on what to do as soon as you get your new Tesla. (I am sure that will make them cringe 🤣)

@sarah_go_green If you are buying a new #Tesla these are the 3 things i would update urgently. I own a #modely. They add security and personalisation. #teslahacks ♬ Pieces (Solo Piano Version) – Danilo Stankovic

Is there a Tesla Discount Code for buying a new Tesla?

Yes, you can get 3 months of Tesla Full Self Driving in the USA, but £250 discount or 650 free Tesla Supercharging miles in the UK. The offer can also be used throughout the world. Tesla incentivises existing Tesla owners to spread the word about Tesla, and in turn, you can get a discount on a new Tesla.

My Tesla discount code is Sarah583995.

Get charged up and Refer a friend to Tesla. 

Get the ultimate reward for driving a Tesla! Share the Tesla love and invite your friends to join the family. With the Tesla Discount code, you’ll get exclusive Tesla credits when you refer someone and they buy their very own Tesla. Plus they will now get a discount on a Tesla, which they will be very happy with!

Start saving up your credits now, and cash out for merchandise or supercharging miles – free Tesla Supercharging miles and rewards for driving the best car around.

Tesla doesn’t pay to advertise instead, they prefer word of mouth. A recommendation to buy a Tesla from a current owner is far more powerful in their view.

The Tesla Referral Awards scheme provides current Tesla owners with a unique referral code which they can pass on when recommending a new Tesla. Both the current and new Tesla owners benefit by sharing and receiving a Tesla referral code or link. I love that they have now changed the scheme to offer a discount on a Tesla rather than allocating referral credits to new owners. The Tesla credits are great but when you are spending money on a large item you really want a monetary discount.

There’s no better time to join the #teslaclub than now! Use my Tesla referral code for a discount on a Tesla and be part of the innovation and luxury that comes with owning a Tesla. Get ahead of the curb and join today. #tesla #referralcode  #JoinNow

I highly recommend buying a Tesla Model Y.

I have owned my Tesla Model Y since February 2022 before I drove a diesel family car. The charging is a doddle thanks to the Tesla Supercharging network and it is a joy to drive. Any questions just send me a message and I will be happy to help. 💚

Just for a bit of fun here I am trying to talk to my  Tesla with a Welsh accent. Tesla has introduced British English as an option in the menu settings and I was trying to see if it would understand me now..the jury is still out. 😀

This is what I love about Tesla it is forever changing and updating. Unlike any vehicle I have driven before it just gets better and better with time!

@sarah_go_green #teslatok #teslabritishaccent #teslavoicecommands #teslawelshvoice #tesla ♬ original sound – sarah_go_green

The Tesla website provides more information about the Tesla Discount Code and how it works in the UK and Europe.

My other blog posts may be interesting because you are buying a Tesla.

• Tesla Model Y Refresh Review – Family EV.
• EV charging – Intelligent Octopus Go.

Don’t Accept the 2% October Price Cap Rise – Save 4.4% with Octopus 12 Months Fixed.

Written by: Sarah Chambers (Updated 24th October 2025)

Existing Octopus Customer – Find out how you can benefit too. T&Cs apply (only one switching offer per household)

Why Fixing Now Makes Sense

The Energy Price Cap went up by 2% on 1st October, but you don’t have to pay more. By choosing Octopus Energy’s 12-month fixed tariff, you can secure a rate around 4.4% below the flexible rates. As a result, a typical household could save roughly £100 a year. I know it doesn’t sound huge, but £100 is £100 I’d rather keep in my pocket for the kids’ lunches, or just not stressing about bills. Moreover, with predictions pointing to a 6% rise in April 2026, fixing now gives immediate savings and protection against future increases. In other words, acting quickly could prevent your energy bills from spiralling later.

The Octopus October v2 12-month fixed tariff is simple and flexible. In addition, it offers cheaper gas and electricity rates, and you can leave at any time with no penalty. This means you don’t have to worry about being locked in overpaying, giving you confidence and control. Equally important, it lets you respond to future changes in energy prices without being tied down.

Choosing the Right Tariff

I know it can feel stressful to pick the right tariff. Energy bills are such a large part of household costs, and nobody wants to get it wrong. That’s exactly why I follow Octopus tariffs closely and share what I learn. For example, I always check my own bills and meter readings before October—it saves me hassle and sometimes a few extra pounds. If you are already with Octopus or planning to switch, the 12-month fixed tariff will cost less than the Octopus Flexible rate and less than the October Energy Price Cap. Plus, you won’t be charged for switching if a better deal comes along later. Therefore, locking in a fixed rate now is a clear and easy choice. Ultimately, it gives you control and reassurance during uncertain times.

Meter Readings: A Crucial Step

If you have a standard meter, submitting an accurate reading before 1st October is essential. Otherwise, you could end up paying estimated charges that may be higher than your actual usage. In particular, households without smart meters should take this step to ensure accurate billing. Additionally, keeping your meter readings up to date makes switching between tariffs faster and simpler. Meanwhile, it helps you track your energy usage more closely, which can uncover extra savings.

Understanding the Energy Price Cap

The Energy Price Cap sets the maximum that suppliers can charge per unit of gas and electricity. From 1st October to 31st December 2025, the cap is:

• Electricity: 26.35p per kWh

• Gas: 6.29p per kWh

• Daily standing charges: 53.68p for electricity and 34.03p for gas, Ofgem.

These rates apply to standard variable tariffs and will change on 1st January 2026. For most households, this means a bill of around £1,755 if you stay on a standard flexible tariff. For example, here is an estimate of what I would pay in South Wales, comparing the Octopus 12-month fixed, Octopus Flexible, and Octopus Tracker tariffs.

Exploring Alternative Tariffs

If you have an electric vehicle (EV) or a heat pump, Octopus Energy offers dedicated tariffs that can be more cost-effective than standard flexible rates. Furthermore, time-of-use tariffs like Agile or Octopus Tracker may suit households with variable energy consumption patterns. However, with the anticipated 7% increase in April 2026, it’s worth monitoring these options closely. Meanwhile, if prices rise faster than expected, you can always switch back to a fixed or flexible tariff to protect your bills. In other words, you have options to adapt to changing energy costs without losing out.

Why Energy Prices Could Rise This Winter

Even though fixing your tariff now gives you savings, it’s worth knowing why energy prices could go up this winter. First, wholesale energy costs can change quickly. These are the prices suppliers pay for gas and electricity, and if they increase, it can push up your bills. Second, global events can make prices unpredictable. Conflicts or tensions in energy-producing countries can disrupt supply, which may mean higher costs here in the UK. Finally, cold weather, policy changes, or unexpected demand can also affect prices.

The good news is you don’t have to guess what will happen. By locking in a fixed tariff now, you protect yourself from surprises and know exactly what you’ll be paying this winter. At the same time, if prices drop later, you still have the flexibility to switch to a better deal.

Conclusion – Take Action Now

With the energy price cap set to rise and winter approaching, now is the ideal time to fix your energy tariff. By acting swiftly, you can lock in savings, gain peace of mind, and take control of your energy bills. Ultimately, choosing the Octopus 12-month fixed tariff offers flexibility, security, and real savings before the October increase. At the same time, it gives you the freedom to adapt if prices change later.

Don’t wait—switch to Octopus Energy’s 12-month fixed tariff today and take control of your bills before the October rise hits.

• Octopus Energy Complete Tariff Guide.
• Why Switch to Octopus Energy?
• Ofgem Survey 2025 – Why you should have your say.

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Looking Ahead: Why I Fixed My Energy Prices with Octopus Before the October Price Cap

It’s still summer, but I’m already thinking about the October Energy Price Cap, and as always, I am giving my take on the current Octopus 12-month fixed tariff, which is August 2025 v2.

This time of year always feels like a turning point. We’re clinging to the last of the warm evenings and outdoor dinners, but deep down, we know what’s coming. Colder mornings. Lights on earlier. Heating back on, if we are lucky, in our daily routines.

For the last few years, this moment has brought a familiar worry: how much will the bills be this winter?

Currently, analysts expect the October 2025 energy price cap to increase by approximately 1.5%. That might not sound huge, but when prices are already high, it matters.

Like last year, I am going to start shouting about reviewing your Octopus Energy tariff now before winter. Their August 2025 V2 fixed tariff is roughly 4.5% lower than the current cap and, more importantly, there’s no exit fee. That means you can lock in a lower rate before winter, and you can still switch if something better comes along.

But the real reason to act now is what’s happening across the world and the ease at which you can switch from one tariff to another with no regrets.

Written by Sarah Chambers.

Existing Octopus Customer – Find out how you can benefit too. T&Cs apply (only one switching offer per household)

Why Energy Prices Keep Changing – It’s Bigger Than Us

Energy prices in the UK aren’t just about how much gas or electricity we use. They’re affected by what’s happening across the globe.

Conflicts in Ukraine. Tensions in the Middle East. Disruption in shipping routes like the Red Sea. These global issues push up the cost of energy — even here at home.

The UK might not rely on Russian gas anymore, but Europe still does. And because we’re all connected to the same international gas market, problems abroad still hit our bills. If demand jumps or a pipeline shuts down, wholesale prices shoot up. And since much of our electricity still comes from gas, we feel the impact quickly.

One flare-up can send prices soaring overnight. By the time it reaches the news, the best tariffs have often vanished.

That’s why you could fix it now, while you still had the choice.

Fixing Isn’t About Fear – It’s About Control

I’m not trying to predict the future. But I do know that heading into winter with a steady rate helps you plan. It’s one less thing to stress about when everything else feels up in the air.

If global prices fall, you can switch. Octopus still doesn’t charge exit fees. That’s rare. Other suppliers are adding pen

alties to lock people in. Octopus keeps it flexible.

And if prices rise? You’ll be glad you did, even though you weren’t quite sure at the time if it was for the best.

If You’re Not Sure What to Do – Try This

I know this stuff is complicated. If you’re unsure, just remember this:

The Octopus August V2 fixed tariff is already cheaper than the Flexible rate most people are on. And if predictions are right, it’ll still be cheaper than the October price cap when that kicks in.

You can’t get it wrong. There’s no commitment, only potential savings. Why pay more?

It’s like choosing a phone contract. One charges 5p per text, another charges 4p. You’d pick the cheaper one, right? And if next week someone offers 3p, you switch again. But you won’t be stuck paying 6p if prices shoot up.

That’s what a no-exit-fee fix gives you. Flexibility, security, and savings. No risk.

Stormy Nights and Free Electricity

Last night, the wind howled across the UK. Rain lashed the windows. But the grid was full of clean wind energy, and thanks to Octopus, I got an hour of free electricity.

@sarah_go_green Get free electricty today between 2pm and 3pm. Sign up to Octoplus. @Octopus Energy #moneytips #moneysavingtips ♬ delulu – NESYA

These little moments remind me why I stay. Fair pricing. Innovative ideas. And the freedom to move when I want.

Final Thoughts

If you’re searching “should I fix my energy prices now” or wondering how the October price cap 2025 will affect your bills, I hope this helps.

For me, the choice was simple. Fixing now gives me peace of mind. And with Octopus, I’m not stuck. If a better deal appears, I’ll take it.

In a world that feels unpredictable, that kind of control is worth a lot.

Other posts by Sarah;

• Octopus Energy Complete Tariff Guide.
• Why Switch to Octopus Energy?
• Ofgem Survey 2025 – Why you should have your say.

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Octopus Cosy 6 and 9 Heat Pump Review: Cost, Savings & Is It Worth It?

Thinking About a Heat Pump? Discover the Octopus Cosy 6 and Its Big Sister, the Cosy 9

If you’re considering switching to a heat pump, the Octopus Cosy Heat Pump series is a game-changer. Designed and manufactured in the UK, it promises affordable, efficient and seamless integration with Octopus Energy smart tariffs.

As a long-time Octopus Energy customer, I’ve followed their journey closely. I was at the Energy Tech Summit in London in 2023 when CEO Greg Jackson unveiled the flagship Cosy 6 and announced ambitious plans to slash installation costs. His vision for innovation and affordability earned a standing ovation and for good reason.

With Octopus Energy making heat pumps more accessible than ever, they even offer a dedicated Octopus Cosy Tariff to keep running costs low.  I’ve been an Octopus Energy customer for years, and when I saw the new heat pump, I knew I had to see if it lived up to the hype.   This Octopus Cosy Heat Pump review will guide you through everything you need to know, helping you decide if it’s right for your home.

Updated 2nd July 2025 – Get an extra 15% any Octopus Cosy Pump installation if you apply before the 3oth August 2025.

Written by Sarah Chambers.

• Also see: Octopus Cosy Controls Guide
• Octopus Cosy Survey Results 

Octopus Energy’s Cosy 6 and Cosy 9: A UK-Made Heat Pump Revolution

I take my hat off to Octopus Energy. When they launched this in April 2022, they had the vision to slash the prices of heat pumps, making them more affordable and attractive for UK consumers. They’ve not only achieved that, but they’ve also secured jobs for many families while proving that the UK can lead the way in the green technology industry.

I grew up in the South Wales Valleys, a mining community where livelihoods depended on the coal industry. We relied on dirty jobs for our communities to survive, even though they brought illness and environmental destruction to our doorstep. That’s why I believe we need companies like Octopus Energy to be bold and innovate, not just to create local jobs but to provide a genuinely affordable alternative for those who want to ditch fossil fuels and electrify their homes.

Greg Jackson the CEO of Octopus Energy is described as a disrupter in the energy market and he is showing his colours when it comes to heat pumps! They are now the largest heat pump installer in the UK.

If you want to take a look at the Octopus Cosy 6 a little more closely this video gives an overview of its capability and shows it being assembled on the production line in Northern Ireland. (It’s a very easy-to-understand video and made me want to clap at the end, but I am a geek!)

How much does an Octopus Energy heat pump cost?

An Octopus Energy heat pump costs as little as £500 for a standard installation, thanks to the £7,500 Boiler Upgrade Scheme (BUS) grant. The total cost of installation is £8,000, with the grant covering 93.75% of the price. This grant is available until 2028. (It’s not based on your income.)

✅ Grant Applied: £7,500 from Boiler Upgrade Scheme (BUS)
✅ Extra Discount: £100 cashback on a gift card using my Octopus Cosy Referral link. (Can be used against any Octopus Heat Pump.)

I have regularly seen quotes of well below £1000 on X. It’s well worth getting a quote from Octopus but just take into account it uses your home’s energy efficiency rating to give a quick quote. It may go up or even down after the survey.

For larger or more complex homes, costs may be higher, but 91% of Octopus Energy heat pump quotes are below the UK national average of £5,565 but I have regularly seen lots of people delighted with the Cosy 6 installed for around the £1000 mark. So it is well worth getting a quote.

Additional costs may apply for extra work such as scaffolding, planning permission, or system upgrades. However, if you need to add some floor boarding, say to your loft or a light for a hot water tank, that is something you could do as a DIY project to keep costs down. Octopus will explain step-by-step what you’d need to do before the Cosy 6 is installed.

How Many Octopus Cosy Heat Pumps Are Available?

As of February 2025, there are currently two Octopus Cosy heat pump models available for installation in the UK:

• Octopus Cosy 6
• Octopus Cosy 9

Octopus has just launched the Cosy 9 in January 2025 and already rumblings are on forums reporting installations in February which is amazing. Not many people have seen the Cosy 9 so this is hot off the press! If you’re looking for an alternative to a gas boiler, this could be a game-changer for bigger households.

Octopus is expected to expand the Cosy Heat Pump series further and I will update this post when information is available.

What’s the Difference Between the Cosy 6 and Cosy 9?

The Octopus Cosy 9 is a slightly bigger model, first installed in January 2025. It shares the same base dimensions as the Cosy 6 but stands slightly taller.

Here’s a quick comparison:

Can I switch Cosy Heat Pump models after getting a quote?

Yes, after the home survey, your Octopus Heat Pump adviser can talk you through all your options and give an exact quote for your heat pump installation.

Are all the Cosy Heat Pumps Eligible for Government Grants?

Yes! Both the Cosy 6 and Cosy 9 qualify for the government heat pump grant, making them more affordable for homeowners switching to low-carbon heating.

Plus, you can get £100 off using my Octopus heat pump referral link ( referral code: 95460 and just to be transparent, I also get £100, thank you if you use it!). Better yet, this discount can be combined with other promotions offered by Octopus!

A First-Hand Look at Octopus Energy’s Heat Pump Vision

I had the chance to visit Octopus Energy’s Slough warehouse back in 2022. At the time, their heat pump operation was still in its early stages. Octopus had just acquired the manufacturing company that would go on to produce the Cosy Heat Pump series, and I met some of the engineers from Northern Ireland who were at the site.

Speaking to them, their excitement was clear. They told me that as a small company, they were excited about the future for both job security and innovation. With Octopus stepping in and investing, they saw a huge opportunity to scale up and bring affordable, high-quality heat pumps to UK homes.

Fast forward three years and the Cosy heat pumps have now been designed, built, and are being installed across the UK showing Octopus Energy’s vision was spot on. This is a massive win for homeowners looking for efficient and affordable low-carbon heating solutions.

Octopus Cosy Heat Pumps – UK Made for Lower Costs and Future Proof Pricing

Unlike other providers, Octopus Energy designs and builds the Cosy 6 in Northern Ireland. This is great for UK jobs and reduces CO₂ emissions from imports. But it also helps Octopus future-proof pricing.

With the government’s Heat Pump Grant ending in 2028, Octopus is focused on scaling up production to drive costs even lower. Owning their supply chain means they are not just taking advantage of grants today but making heat pumps more affordable in the long run.

What Makes Cosy Heat Pump Different?

By manufacturing the Cosy heat pumps, Octopus cuts out the middleman, which means lower costs and better quality control.

The Pac-Man shape Cosy Heat Pump is compact and rounded, unlike the long, boxy units most people picture. The smaller size makes installation easier and helps keep costs down.

Octopus isn’t just chasing lab efficiency numbers. They focus on real-world savings for customers. Older homes don’t operate under perfect test conditions, so what matters is actual performance, not just theoretical figures.

That’s why Octopus created the Cosy Tariff a special electricity tariff designed to keep running costs low for heat pump users. They don’t just sell you a heat pump they make sure it works affordably in the long run too.

Octopus Cosy Heat Pump Installation Process – What to Expect

Hassle-Free Installation Octopus Cosy 6 and Cosy 9.

Octopus has made the process as easy as possible:

1. Instant Online Quote — Answer a few simple questions and get a personalised estimate on the spot. Octopus automatically applies the government grant to all their Heat Pump quotes.
2. Home Survey — An expert visits your home to do a heat loss calculation, ensuring your heat pump is the perfect size.
3. Fixed-Price Contract — No hidden fees. If you need new radiators or prep work, it’s all included in the price.
4. Bonus – If you quote my code 95460 to your Octopus heat pump advisor, you’ll get an extra £100 off. The discount can be used with any other offer Octopus may be running.  (I get £100 credit too)
5. 15% off if you apply before 30th August 2025.

How to Get £100 Credit on a Heat Pump Installation

Getting your £100 discount is simple:

🔗 Step-by-Step: How the Octopus Referral Link Works

1. Click my referral link
   This is your key to unlocking the £100 referral reward.

2. Enter your name and email
   This registers you for the £100 Visa card reward from Octopus.

3. Get your personalised quote
   You’ll be taken to the Octopus Cosy Heat Pump quote tool. It takes just a few minutes, and the £7,500 government grant is automatically applied.

4. Receive an email with the next steps
   Octopus will send you an email explaining how to get your heat pump quote and what to expect next.

5. Install your heat pump and claim your reward
   If you go ahead with the installation, you’ll receive a £100 Visa card, and so will I as a thank-you. If you use my link, it will be very much appreciated!

🔸 Additional Tip:
✅ Once you have registered your name and email the Octopus heat pump reward is instantly registered. You have to use the same email on your online heat pump quote for the £100 reward to be counted!

Important: My previous Octopus heat pump referral code below no longer counts for new quotes. However if you use my Octopus Cosy Referral Link you will still get the £100 deducted from your final heat pump installation invoice. Plus if you get a quote before the 30th August 2025 you’ll get an extra 15% off.

Referral Code	Discount	Referred By	Additional Benefits
95460 (Mine!)	✅ £100 Off	✅ Sarah Chambers ( Sarah Go Green)	✅ Can be used in conjunction with any other Octopus offer in 2025

 

✅ Octopus Handles the Paperwork for Your Heat Pump Application

One of the best things about getting a heat pump with Octopus? They take care of all the paperwork for you in typical Octopus style. It is all easy to understand and follow along with.

Once you’ve signed the final sales agreement, Octopus will send you an email confirming they’ve completed the ENA application and submitted it to your DNO. They’ll also handle the Government BUS grant application and the HEIS warranty application on your behalf.

After everything is processed on their end, they’ll advise you to keep an eye out for an email from Ofgem regarding your grant application. All you need to do is click the link and confirm your eligibility. It’s also worth checking for any messages from your DNO in case they need any further details. You just forward these to Octopus.

Should you need planning permission for your heat pump installation Octopus can help you with this they cannot submit the form on your behalf but your Octopus adviser will talk you through this early on.

Octopus say that; Most heat pumps can be fitted under something called “permitted development” which means that planning permission is not required.

At this point all you have paid is a £200 deposit, the rest is payable upon completion of your Cosy 6 installation. It’s that easy Octopus makes the whole process hassle-free! 💡

Q: Why do I need to pay a deposit before the survey?

• Octopus Energy requires a deposit as a commitment to show you’re serious about proceeding with the installation.
• This helps them allocate resources and plan your heat pump installation efficiently.
• The deposit is fully refundable, so if you decide not to go ahead, you’ll get your money back.

How Much Can You Save with a Heat Pump?

Savings vary, and Octopus is refreshingly honest about that. TJ Root, Director of Flexibility at Octopus, compares it to a car’s MPG rating. Your actual efficiency depends on how you use it, your home setup, and the weather. That’s why having Octopus Energy on hand with advice and a dedicated heat pump tariff makes sense.  They can even remotely monitor your Cosy heat pump and diagnose any issues.

I delve further into the cost saving of the Cosy Heat Pumps towards the end of this blog post.

This is a great overview of the Octopus Cosy Heat Pumps.

Getting the Right Fit Matters with any Heat Pump, including the Cosy 6 and Cosy 9.

If your heat pump is too small, it won’t keep you warm. If it’s too big, you’ll waste energy and money. Think of it like picking the right sized speaker for a room too small and it struggles, too big and it’s overkill.

Heat pumps run at lower temperatures than gas boilers, so some homes need bigger radiators. Octopus takes care of this as part of the installation, making sure your system works efficiently from day one.

Octopus will help you decide which of the Octopus Cosy series best meets your home’s needs.

Carbon Footprint – The Eco-Friendly Choice

A heat pump is 3-4 times more efficient than a gas boiler. For every unit of electricity used, you get three to four units of heat. While electricity costs more per unit than gas, this high efficiency cancels that out, making it cheaper overall.

As more green energy sources enter the grid, running a heat pump gets even cheaper and greener. Unlike many imported models, the Cosy 6 is built in the UK, meaning lower transport emissions and a smaller carbon footprint right from the start.

How Long Does a Heat Pump Last?

With regular maintenance, a heat pump lasts 15 to 25 years which is longer than a gas boiler.

Octopus Cosy 6 and Cosy 9  –  8 Year Warranty & Aftercare.

• 8-year warranty included  for your heat pump – £0
• Optional monthly maintenance plan with annual servicing – First-year service is free and then it’s £9 a month directly with Octopus. (Same-day call-out when you contact them by midday.)
• Dedicated support team for quick issue resolution – open 8 am to 8 pm on weekdays and 10 am to 6 pm on weekends.

If something goes wrong, you’re not dealing with a third-party company everything is handled by Octopus directly.

You can read more about Octopus warranty and aftercare here.

Octopus Cosy 6 and Cosy 9 Smart Features & Future-Proof Design

The Cosy 6 is built to last and designed for modern homes:

• Uses eco-friendly R290 refrigerant
• Works in temperatures as low as -25°C
• Includes smart controls for easy remote management

This is what excites me the over-the-air software updates which means your heat pump improves over time, just like a smartphone.

🚀♻️🚨 Potential Downsides of the Octopus Cosy 6 and Cosy 9 🚨

❌ Learning Curve – Some users find heat pumps different from gas boilers.
❌ Space for the Hot Water Tank – If upgrading from a combi boiler, you’ll need a storage tank which will require more upheaval to install.
❌ Electricity Prices Can Vary – Tariffs change, so it’s worth reviewing your energy deal yearly.

How does the Octopus Cosy 6  and Cosy 9 Heat Pump work?

Octopus Cosy: The All-in-One Energy-Efficient Heating Solution – What do you get?

Octopus Cosy is a complete home heating package;

• Cosy 6 heat pump. (6 kW) or Cosy 9 heat pump (9 kW)
• Hot water cylinder.
• Cosy Hub.
• Up to four Cosy Pods.

Powered by Octopus Energy’s cutting-edge technology, Cosy efficiently heats your home and water using up to 4x less energy than a traditional gas boiler. You can enjoy smarter, greener, and more cost-effective heating with the Octopus Cosy heat pump.

Octopus has looked at how a customer can be the most comfortable in their home in the most energy-efficient way and it is reflected in the package the Cosy Heat Pump series offers.

I have also written an overview of the Octopus Cosy 6 and 9 controls which you may find helpful.

Octopus Cosy 6 and Cosy 9 Heat Pump: A Bold, Unique Design That Delivers Efficiency.

The Cosy 6 and Cosy heat pumps are high-efficiency air-to-water heat pumps designed by Octopus Energy to provide homes with low-carbon heating and hot water. The unit works by extracting heat from the outside air even in cold temperatures and using it to warm up water for central heating and hot taps.

Key features of the Cosy Heat Pump units:

• Air-to-water heat pump: Transfers heat from the air into your home’s heating system.
• Efficient in low temperatures: Works even in freezing conditions.
• Variable speed inverter technology: Adjusts power output to match heating demand, improving efficiency.
• Quiet operation: Engineered to minimize noise.
• Compact design: Aimed at being space efficient while delivering high performance. I believe both the Cosy 6 and the Cosy 10 have the same footprint at the base. The Cosy 10 is just taller.
• Weather compensation sensor: This is located on the back of the Cosy 6 heat pump.

It’s designed to be an easy-to-use, cost-effective replacement for traditional gas boilers while reducing carbon emissions.

You can find a detailed list of the Cosy 6 specifications here.

Easily Control Your Octopus Cosy Heat Pump with the Octopus App

The Octopus Cosy 6 and 9 heat pumps are fully controlled through the Octopus App, making them simple to use. Once installed by an Octopus engineer, your system runs automatically but you can customise settings anytime to suit your needs.

With the app, you can:
✅ Turn your heat pump on or off
✅ Set schedules for efficiency
✅ Use boost mode for extra warmth
✅ Monitor energy usage in real-time

Enjoy effortless heating with the Octopus Cosy heat pump, designed for convenience, efficiency, and control at your fingertips.

You can take a look at how to get to grips with the Cosy 6 and 9 controls here.

Octopus Cosy Heat Pump Hub and Pods: The Smartest Way to Control Your Heat Pump.

The Octopus Cosy 6 and Cosy 9 Hub and Pods are a next-gen smart heating control system, designed to work seamlessly with Octopus Energy’s smart tariffs and energy-saving features.

If you’ve used Hive, Tado, or Nest for central heating, you know how convenient smart thermostats are. Until recently, heat pumps lacked a similar option until the Octopus Cosy 6 changed that.

I genuinely think the Cosy 6 Hub and Pods are miles ahead of the competition for heat pump controls. I’ve even met Derya, one of the Octopus engineers behind it, at an Octopus event. She’s an absolute genius in smart home tech (and also the brains behind the Octopus Home Mini!).

How does the Octopus Cosy Heat Pump Hub work?

The Cosy 6 and Cosy 9 Hub is the brain of your Octopus Cosy 6 heating system, designed to optimise and automate your heat pump for maximum efficiency. By intelligently adjusting your heating, it helps lower your energy bills while keeping your home warm and comfortable.

This smart control unit is wired into your power supply and connects to your home WiFi, allowing seamless communication between your Cosy 6 heat pump, heating pods, and the Octopus Energy app. With real-time data and automation, the Cosy 6 Hub ensures your heating runs at its best so you can enjoy a cosy, energy-efficient home without the hassle.

You can adjust your heating and hot water remotely via the app or manually using the buttons on the unit.

• The Boost button lets you temporarily override schedules to heat your home.
• The Hot Water Boost heats your water up to 50°C for 2 hours—it’s more efficient than using your immersion heater.
• You can use both Cosy 6 and the immersion at the same time if you need hot water quickly, but I recommend keeping the immersion off unless necessary as it’s around double the price to run!

Cosy 6 Review – Eleri: It’s very straightforward to use. Adjusting the temperature is simple, and it doesn’t require much effort. It’s great knowing that it’s just doing its job without constant attention.

Cosy Heat Pump Pods: What Do They Do?

The Cosy 6 and Cosy 9 Pods replace your old thermostat and feed temperature and humidity data back to the Hub. Octopus usually installs four pods around your home, and you can choose where they go.

Each pod can be set to do one of two manual functions:

1. Boost heating in that zone
2. Boost hot water

Your Octopus installer sets this up, so make sure you tell them which function you’d prefer for each pod! For example, having a hot water boost button in the kitchen could be handy.

Right now, there’s no digital display on the Hub or Pods so you’ll need to check the app to see the temperature. Personally, I’d love to see Alexa integration in future (like Tado has), so you could ask it for room temperatures or use voice commands to boost heating.

Why I Like the Cosy Heat Pump Hub and Pods.

✔ Set schedules for heat and hot water – all controlled through the app.
✔ Monitor room temperatures remotely – handy when you’re out.
✔ Boost heating in specific areas – great for quick adjustments without opening the app.
✔ Energy-efficient hot water boosts – uses around half the electricity of an immersion heater.
✔ Future-proof tech – I expect Octopus will add more integrations over time.

If my mum was visiting and wanted the lounge warmer while I was out, she could just tap the pod in that room. My kids? They’d have to wait for me to come home! 😂

For the real tech geeks, Cosy Heat Pump doesn’t yet integrate with Home Assistant, but I suspect Octopus has the data to enable this in the future.

Overall, the Octopus Cosy 6 is a game-changer for heat pump owners. It’s not just a smart thermostat it’s a fully integrated system designed to cut costs. It also saves energy, and gives you more control over your heating making it better for your pocket and the planet too!

Octopus Cosy Hot Water Tank: Hot Water, Less Waste, No Drama

The Octopus Cosy hot water tank is built to keep your home supplied with reliable, energy-efficient hot water, working seamlessly with the Cosy 6 heat pump. Unlike a traditional boiler-fed system, this tank is designed to store and maintain hot water at the perfect temperature, ensuring you always have a steady supply when you need it. It’s well-insulated to minimise heat loss, meaning less wasted energy and lower bills. This might mean it takes up slightly more room than your current hot water tank (if you already have one) but Octopus will run through all of the options in your home survey. 

Whether you’re running a morning shower rush or filling up a deep bath after a long day, the Cosy Tank should deliver without the wait or waste. However, if you need to get that hot water topped up in a hurry you can always hit the boost button on your Cosy Pod or in the Octopus app. (Make sure you ask the engineer doing your install to make one of the pods a hot water boost button.)

Just remember you can always use the boost button too if Octopus has a free electricty session! Get that hot water all topped up on super green electrons.

How fast does the Cosy Heat Pump heat hot water?

I have three teenage daughters so the issue of hot water was quite high in my research. The Cosy 6 high-temperature heat pump heats water surprisingly fast usually within an hour avoiding drama. You can schedule overnight ready for the morning as an example, but I would suggest allowing a two-hour window just in case. Once the water reaches the set temperature, the system automatically switches back to heating, so you can run both at the same time.

Just so you are aware the hot water takes priority, but as soon as that is up to temperature, control is handed back to heating, ensuring your home stays warm without interruption.

Heat Pump vs. Gas Boiler: Like Sailing vs. Rowing (with a Motor as a Bonus!)

Think of heating your home like moving a boat across a lake:

🚣 A Gas Boiler is Like Rowing – You’re generating all the power yourself, using fuel (gas) and effort (burning energy) to move forward. It works, but it uses a lot of energy.

⛵ A Heat Pump is Like Sailing – Instead of creating all the power yourself, you harness energy from the wind (the outside air) and let nature do most of the work. You still need some input (electricity), but it’s far more efficient than rowing.

⚡ A Heat Pump on an Off-Peak Tariff? That’s Like Adding a Motor to Your Sailboat – You still use the wind (air-source heat), but when conditions are right (off-peak electricity), you can boost efficiency even more and get where you’re going comfortably with minimal effort and cost.

A gas boiler burns fuel to create heat, so for every 1 unit of gas, you get 0.9 units of heat.

A heat pump moves heat from the air into your home instead, giving you 3 to 4 units of heat per 1 unit of electricity just like a sailboat harnessing wind to move with way less energy than rowing! 🌬️⛵🔥

What is COP? Understanding Heat Pump Efficiency

COP (Coefficient of Performance) is just a technical way of saying how efficiently your heat pump turns electricity into heat. It’s a snapshot, not a fixed number and it changes daily depending on things like outside temperature and how hot you set your water or heating. Your COP is a combination of your heating and your hot water temperature.

Why Does COP Matter? 

Like our sailing vs. rowing example, COP shows how many units of heat you are getting for a unit of electricity. The more units of heat you get, the cheaper your bills.

COP in Everyday Terms – Should You Worry About It?

You’ll find lots of YouTubers talking about their COP rate. If that interests you, great! But most people just need to know that:

✔ Your Octopus app tracks your COP for you.
✔ It’s not something you need to constantly check
✔ Lowering your hot water temp (e.g., 40°C instead of 55°C) improves efficiency (Not always the best idea though)

But let’s keep it real,  you still need water hot enough for a decent shower, so you can save money lowering the temperature but will you enjoy the experience?  I have three daughters and sometimes I need to escape for a hot bath too from time to time!!

If you want to save money I would spend time researching the right Octopus tariff to go with your new heat pump! You could look at the Octopus Cosy or Agile tariffs. If you also have an EV look at Octopus Go and Intelligent Octopus Go.

The Cosy 6 and Cosy 9, COP & Cost – A Quick Example

Let’s talk numbers and tariff prices very quickly I’ll keep it simple.

How Much Does a Heat Pump Cost to Run? 

If you use 1 kWh of electricity at 25p and your heat pump has a COP of 3, that means it produces 3 units of heat.

• That works out to 8.3p per unit of heat.

Now compare that to gas:

• 1 kWh of gas costs around 6.5p, but gas boilers are only 90% efficient.
• That means you get less than 1 unit of heat per kWh, making the actual cost 7.2p per unit of heat.

At first glance, gas looks cheaper. But here’s the game-changer, Octopus offers off-peak electricity tariffs for heat pumps and a variety of other smart tariffs that might suit your needs. Gas users are limited to the traditional gas tariff or Octopus Tracker, which changes daily. Right now the Octopus Tracker tariff is often higher than the standard Octopus flexible rate so it’s not much of an option to lower your costs greatly.

Why Heat Pumps on an Octopus Smart Tariff Can Beat Gas 

With the Cosy Octopus Off-Peak tariff, you can get electricity for around 12.5p per kWh for 8 hours a day.

• That drops your heating cost to 4.2p per unit of heat—cheaper than gas.
• Plus, with a COP of 3 – 4, you could get even better savings!

So What Does This Mean for You?

Honestly? Don’t overthink it. I didn’t want to add this section in just in case it sounded complicated but your Octopus app tracks everything for you. Over time, you might tweak your settings to find the perfect balance of efficiency and comfort, but you don’t need to be a heating expert! I most definitely am not. I hope I have made it less scary to understand.

Octopus monitors your system remotely, so if anything goes wrong they can help. Your Octopus installer will also set everything up and show you how the app works too. Plus if you get stuck they have support too.

If you’re the kind of person who loves digging into data, you can get nerdy about your COP and try different settings. But if you’re like me with three daughters who love long, hot showers your COP might take a hit from time to time! 😆

Luckily, heat pumps automatically handle things like legionella cycles, so there’s nothing to stress about. I hope this information is useful to know if you ever see COP mentioned!

Final Thought on Cosy Heat Pumps and COP:

With the right tariff, a heat pump can be cheaper than gas. On the standard variable tariff personally from what I have read because the standing charge is so high for electricty there won’t be a lot of savings. From talking to people on X and from the example below given by Octopus it works out about the same as gas BUT you can and should opt for an Octopus smart tariff with a good off-peak rate which will slash those bills. You can’t get that with gas and that’s where you can not only be greener but reduce your bill too!!

The SCOP on the Octopus Cosy 6 is 3.4 at 50C. If you want to look into the Cosy 6 performance I would search for SCOP rates.

SCOP is a more realistic picture of a heat pump’s performance compared to COP. It stands for Seasonal Coefficient of Performance and as the name suggests gives you the COP rate average for a season eg winter.  Weather conditions throughout the season and usage at home so looking at SCOP makes more sense if you are delivering a little deeper doing more research. If you are not at least you’ll know what it means and will sound zippy lol.

I am super geeky about Octopus tariffs so don’t be scared to reach out for help on social media. There are lots of heat geeks on X too who are always happy to give a second opinion on other Octopus customers’ tariffs and bills.

Octopus Cosy Tariff – How It Saves You Money

The Octopus Cosy Tariff is designed specifically for heat pump users, helping you maximize savings by shifting your energy use to off-peak times. Here’s how it works:

• ✅ Up to 20% cheaper electricity vs standard tariffs
• ✅ Three off-peak price windows for better savings
• ✅ Even bigger savings for homes with battery storage

Just remember you are not locked into using Octopus Energy for your energy supply. Octopus has some great tariffs but you don’t need to be an Octopus Energy customer to get an Octopus Cosy heat pump installed, and even if you are you can switch providers at any time. You are not locked into Octopus tariff and you still get access to the Octopus app regardless if they supply your electricty or not.

Real-World Cost Comparison – Is the Octopus Cosy Heat Pump Cheaper?

When it comes to gas, you pay the same unit price 24/7 and even if you opt for the only smart tariff for gas, the tracker tariff it’s very high at the moment! But with electricity, Octopus Energy offers a variety of smart tariffs that reward you for using energy when demand is low. These tariffs are ideal for various smart devices like heat pumps, EVs, and battery storage, or just helping you cut costs and go greener by using cheaper greener energy when it’s available on the grid

The Octopus Cosy heat pumps are easy to control and can be cheaper to run than gas, but your savings depend on your home, energy habits, and chosen tariff. Octopus Energy’s analysis shows:

✅ Average savings of 20% on electricity bills compared to the Flexible Octopus tariff.
✅ Most customers save between 7% and 27%, with battery users seeing the highest savings.
✅ New three off-peak windows on Cosy Octopus make it even more attractive – especially for those with battery storage.

Which Tariff is Right for You?

• Cosy Octopus: Ideal for those with a heat pump. If you have battery storage you have the advantage that you can store energy in the off-peak window and continue to run your home off the reduced rate even outside the Cosy price dips. The more battery storage the better!
• Intelligent Octopus Go: Best for EV owners like Richard, who have an EV and a heat pump. He shared his experience on X:

“We’ve had our Octopus-installed heat pump for a year. We still use Intelligent Octopus Go because of our EV. Our heating is always on for efficiency, and we still saved £200!” – Richard Lewis, X, 7th Feb 2025.

A heat pump is cleaner and more efficient than a gas boiler. Yes, you’ll pay more per kWh for electricity than gas, but your heat pump produces way more heat per unit of energy and just like an air fryer uses less energy than a traditional oven but still cooks your food perfectly.

That’s why heating your hot water with the Cosy Heat Pump is about half the price of flicking on an immersion switch. Heat pumps are just that efficient, using a mix of air and electricity to keep your home warm for less. Plus now you can use smart tariffs to access cheaper electricty too!

Remember you can switch tariffs at any time so you could choose a tariff like Cosy for the winter and then change in the summer if that suits you better, for example, if you have solar panels you may choose Octopus Flux.  If you want to chat about your setup or ask questions join the conversation with me on X. I also have lots of information through this website which I update rather too frequently for my husband’s linking!!!

Octopus Cosy Heat Pumps and the Octopus Flexible Tariff.

Charles who follows me on the social media platform X said he isn’t on the Octopus Cosy tariff but he’s still paying about the same as he did by using a gas boiler to heat his home so the Octopus results above ring true. A large chunk of the difference is in the standing charge between gas and electricty.

I have just had a heat pump installed, I am not on Cosy tariff. I am finding that the extra electricity I am using is about the same as the cost of the gas I used to use. However, the entire house is sitting at 20C and there are no hot and cold spots like before. Win for me – Charles on X, 8th February 2025.

Finding the right tariff for you may take some research even if it just takes a little time it’s worth it. The Cosy 6 is super efficient but in my view, you have to make sure you match it with the best Octopus tariff. It’s why I write this blog and chat so much on social media. I love the fact there are so many ways to save money with Octopus. You might find this blog post by Octopus Energy about savings you can make of interest. It’s a great post if you want to learn more about savings you could make with an Octopus Cosy 6 heat pump.

Return on Investment: Is a Heat Pump Worth It?

I get it that when spending money on new tech, we naturally ask about the payback period. However, funnily enough, we rarely do this for gas boilers, petrol cars, or even kitchen renovations!

The reality? If you’re replacing a working gas boiler, it may take years to see savings. But if you need a new heating system anyway, a heat pump is a no-brainer it’s more efficient, lower running costs, and is future-proofed for the next 15-25 years.

✅ Government Grant – The £7,500 BUS grant brings the upfront cost as low as £500, making heat pumps as cheap (or cheaper) than a gas boiler.
✅ Smart Tariffs Slash Running Costs – Pairing the Cosy 6 or Cosy 9 with an Octopus smart tariff can make it cheaper to run than gas.
✅ Future-Proofing – Gas prices are unpredictable, while heat pumps are designed to work with an increasingly green energy grid, which is getting greener every year.

Honestly? Instead of asking about payback periods, I’d ask how much longer we’ll keep throwing money at gas boilers that will always cost to run. If you get the right tariff, you can make savings, especially with off-peak rates. Plus, there’s an extra £100 cashback with my referral link if you decide to go for it.

How the Cosy Heap Pump Optimizes Your Energy Use

Any Cosy heat pump integrates directly with your Octopus Energy app, automatically optimising itself for maximum efficiency. With Octopus Energy’s smart technology, it’s likely we’ll soon see new smart tariffs that automate heat pump usage just like Octopus already does with EV charging.

Cheaper Electricity Could Make Green Tech Even More Attractive

If Greg Jackson, CEO of Octopus Energy, succeeds in introducing regional pricing, electricity costs could drop significantly in some areas. Lower prices would make heat pumps, electric vehicles, and other green technologies even more cost-effective, accelerating the transition to cleaner energy.

Octopus is Revolutionising the Heat Pump Industry with their Cosy Heat Pumps.

Octopus is not just installing heat pumps they are transforming the industry. Their Cosy Heat Pump series and streamlined installation process make switching easier and more cost-effective than ever.

It is a breath of fresh air. By creating more UK jobs in the green sector and providing an affordable, planet-friendly heating option, Octopus Energy is leading the way in the future of home heating.

Get £100 off your Octopus Cosy 6 and Cosy 9 Heat Pump – Use Referral Code 95460.

If you decide to get a heat pump installation with Octopus Energy, you get £100 cashback on a gift card.

Just for transparency, I will also receive £100 as a bill credit—win-win! Thank you if you decide to use my code.

✅ No need to be an Octopus Energy customer—you can still get an installation.
✅ Thinking of switching your energy supply? We can split another £100, giving us £50 credit each when you switch.

If you are requesting a Cosy Heat Pump quote before 3oth Augsut 2025, you’ll get an extra 15% off. You’ll also get a £100 Visa gift card when you use my link.

The Verdict: Are the Cosy Heat Pumps worth it?