Snow Problem for Heat Pumps: Octopus Cosy 6 & Cosy 9 Keep Homes Warm During UK Cold Snap
Your Guide to Smarter Home Heating
The UK’s recent cold snap has put the Octopus Cosy 6 and its fellow Octopus heat pumps to the ultimate test, and the results are in: 9 out of 10 customers reported their homes stayed warm and cosy, even in freezing conditions which is music to my ears.
A new Octopus Energy survey found that 86% of Octopus heat pump users felt satisfied with their system’s performance when temperatures dropped. This proves once again that Octopus Cosy 6 and Cosy 9 heat pumps offer a solid alternative to gas boilers during UK winters.
Nothing speaks louder than real-world examples of ordinary customers using green tech successfully.
Written by Sarah Chambers
Octopus Cosy 6 & Cosy 9 vs. Gas Boilers: Real Customers, Real Savings
One of the biggest concerns for homeowners considering a heat pump is cost and performance. However, Octopus Energy’s latest survey of over 1,700 households found that:
✅ 63% of former gas boiler users said their Octopus heat pump made their home more comfortable
✅ 69% reported that their Octopus heat pump was cheaper or as cost-effective to run as a gas boiler
✅ 83% of respondents would recommend switching to an Octopus heat pump like the Cosy 6 or Cosy 9 heat pump
This survey confirms what many Octopus customers have already discovered the Octopus heat pumps don’t just match the performance of traditional boilers they often outperform them while reducing energy bills if you pick the right tariff.
Staying Cosy with Octopus Free Boosts
This winter has been particularly brutal, but Octopus Energy is proving once again why they’re leading the way in using green tech to replace fossil fuels and slash heating costs. Their latest innovation, Cosy Boost credits, is yet another example of how they’re helping customers stay warm without breaking the bank.
From 1st February until the end of 2025, Cosy Octopus customers will receive a £1 Cosy Boost credit on any evening when temperatures in their area drop below zero degrees (based on the average temperature between 12 pm and 6 pm). That credit is enough to cover the cost of running your heat pump for around 30 minutes—perfect for getting your home cosy just before your super-cheap off-peak period kicks in.
This is where the Boost function in the Octopus Energy app comes in handy. Instead of waiting for your off-peak tariff to kick in, you can use the Boost feature to take advantage of the free 30 minutes of electricity and warm up sooner, without extra cost. It’s a smart way to maximise savings and comfort during the coldest nights and it’s typical of Octopus to come up with a plan like this on Valentine’s Day.
It’s not just Cosy Boost credits that help customers save. Octopus Energy often runs free energy sessions for Octoplus customers, offering them the chance to use electricity at no cost during specific periods. If you time it right, you can use one of these sessions to heat your home for free fantastic way Octopus is helping customers cut bills while using greener energy.
If you are thinking of having an Octopus Cosy heat pump this video gives a great overview of the product and its functions as well announcing the Cosy Boost offer.
How Much Can You Save with an Octopus Cosy 6 or Cosy 9 Heat Pump?
With the £7,500 Boiler Upgrade Scheme (BUS) grant, you can install an Octopus Cosy 6 or Cosy 9 heat pump for a price comparable to a new gas boiler. But the real savings start after installation:
🔹 The Cosy Octopus tariff can cut running costs by up to £315 a year compared to a standard gas boiler tariff.
🔹 Smart heat pump tariffs let you use cheaper electricity during off-peak hours, slashing costs even further.
🔹 Removing your gas meter eliminates gas standing charges, providing an extra hidden saving that many people overlook!
I recommend exploring all of Octopus’ smart tariffs. The Cosy Octopus tariff was designed specifically for heat pumps, but every home is different. You might find that Octopus Agile, Tracker, or other smart tariffs work out cheaper, especially if you have additional green tech like an EV, battery storage, or solar panels.
📌 Tip: If your boiler has failed and you need a replacement urgently, let Octopus Energy know they may be able to prioritise your survey date.
Octopus Cosy 6 and 9: Made in the UK for a Greener Future
The Octopus Cosy 6 and Cosy 9 heat pumps are built in the UK, reducing carbon emissions and creating local jobs. By manufacturing domestically, Octopus Energy supports the UK economy and cuts the environmental impact of overseas production. These heat pumps help drive the transition to cleaner, more sustainable heating solutions.
Octopus Energy’s Commitment to Innovation & Customer Support
This latest survey reinforces how Octopus Energy continuously refines its products and services to meet customer needs. For instance, the Octopus Cosy 6 and Cosy 9 heat pumps feature advanced monitoring technology. This ensures optimal performance and reliability in all weather conditions. Moreover, these smart systems provide real-time data to maximise efficiency and prevent issues before they arise.
Beyond technology, Octopus also stands out with its in-house call centre and dedicated servicing team, providing fast responses to maintenance issues. Unlike many other energy providers, Octopus prioritises customer satisfaction with expert support, ensuring that Cosy 6 and Cosy 9 owners receive the best experience possible.
Octopus Cosy 6 & Cosy 9 Heat Pumps Work in Freezing Weather – Here’s the Proof
A common myth about heat pumps is that they struggle in extreme cold. But during the UK’s January cold snap, temperatures dropped well below freezing, and heat pumps still delivered consistent, reliable warmth.
As Alex Schoch, Global Director of Clean Tech at Octopus Energy, explains:
“As temperatures plummeted, heat pump performance soared. This survey confirms what customers tell us every day: heat pumps are just as good, if not better, at keeping houses cosy. And our innovative tariffs mean they’re better for wallets too.”
Octopus Cosy 6 Heat Pump: Winter FAQs – Everything You Need to Know
General Questions
What is the Octopus Cosy 6 Heat Pump, and how does it work?
The Octopus Cosy 6 is a highly efficient air-source heat pump designed to heat your home using renewable energy. It works by extracting heat from the outside air, even in freezing temperatures, and transferring it inside. Unlike gas boilers, heat pumps operate at lower temperatures but provide consistent, energy-efficient heating all year round.
What grants or funding are available for the Cosy 6 heat pump?
The UK government offers the Boiler Upgrade Scheme (BUS), providing £7,500 off the cost of installing a heat pump. This makes switching to a heat pump much more affordable. Octopus Energy also handles the grant application process for you and it is not means-tested! You can use my referral code 95460 to get an extra £100 off too. (Just to be transparent I get £100 credit if you use it, thank you if you do!)
How does the Cosy 6 perform in winter?
The Cosy 6 heat pump is built for UK winters, operating efficiently even in sub-zero temperatures. It uses advanced defrost cycles and weather compensation to adjust performance based on outdoor conditions. Heat pumps work best when left running continuously, keeping your home warm without big energy spikes.
Is the Cosy 6 heat pump suitable for cold UK winters?
Yes, the Octopus Cosy 6 is designed to handle cold, damp UK winters. It can maintain indoor temperatures even when the outside temperature drops as low as -15°C. With proper insulation and radiator upgrades, it provides reliable, energy-efficient heating throughout the colder months.
The front facings fan is angled to prevent snow build-up. Snow shouldn’t reduce its performance.
Will my house stay warm enough with a heat pump in freezing temperatures?
Yes! While heat pumps don’t blast out instant heat like a gas boiler, they provide steady warmth. The key is leaving it on longer and ensuring your home is well insulated. Many users on X have commented that their home is just as warm (if not warmer) than with a traditional boiler.
Performance & Running Costs
Does a heat pump use more electricity in winter?
Yes, but the Cosy 6 remains highly efficient, even in colder months. Since air temperatures drop, the pump needs to work harder to extract heat. However, it still delivers three to four times more heat energy than the electricity it consumes, making it much cheaper to run than a standard electric heater.
How much does it cost to run the Cosy 6 heat pump in winter?
Running costs depend on your tariff, home insulation, and heating settings. On average, a well-insulated home using the Cosy 6 could cost around £500-£900 per year to heat, compared to over £1,200 for a gas boiler. Choosing an Octopus Energy heat pump tariff, like Cosy Octopus, can significantly reduce electricity costs. However, everyone’s home needs are different and you may save even more on another Octopus smart tariff.
Does Octopus Energy have a cheaper tariff for heat pumps in winter?
Yes! Cosy Octopus is a special tariff designed to lower heat pump running costs, offering cheaper electricity rates when used efficiently. Octopus also provides smart home integrations that help optimise performance and reduce costs further.
How does the Cosy 6 heat pump adjust to extreme cold, snow, or frost?
The Cosy 6 features an intelligent defrost cycle, which prevents ice buildup on the outdoor unit. It also has a weather compensation system, adjusting its output based on external temperatures, ensuring consistent warmth even in freezing conditions.
Installation & Setup
Can Octopus fit the Cosy 6 heat pump in older homes?
Yes, but older homes may need upgrades like better insulation and larger radiators to get the best efficiency. Octopus Energy provides a home survey to ensure your property is heat pump-ready and decide what heat pump you will need. At the moment in the Cosy series that is a Cosy 6 and Cosy 9.
♨️ Why Aren’t My Radiators as Hot as Before?
- The original heat pump design likely specified a 50°C flow temperature.
- Radiators are designed to release heat efficiently at lower flow temperatures, meaning they will feel warm, but not scorching hot.
- In warmer months, the system can modulate down to 40°C, further improving efficiency.
Do I need bigger radiators for the Cosy 6 to work effectively?
In some cases, yes. Heat pumps work best at lower temperatures, so they may require larger or more efficient radiators to spread heat effectively. Octopus assesses this as part of the installation process.
Why Your Cosy Heat Pump Needs Proper Drainage and Elevation?
When installing an Octopus Cosy heat pump, it’s crucial to ensure proper drainage and elevation to maintain efficiency and longevity.
Understanding the Defrost Cycle
In heating mode, your Cosy heat pump extracts warmth from the outside air, which can cause moisture to condense and freeze on the unit’s coils. To combat this, the heat pump periodically enters a defrost mode, melting the accumulated ice. The resulting water then drains away from the unit.
Without adequate drainage, this defrost water can pool beneath the heat pump, leading to potential issues like ice formation on the ground or even refreezing within the unit, which can hinder performance.
The Importance of a Soakaway
A soakaway provides a solution by allowing defrosted water to disperse safely into the ground. This can be achieved by:
- Gravel Bed: Surrounding the base of the heat pump with loose, coarse gravel facilitates efficient water absorption.
- Existing Drains: Directing the condensate into an existing external drain ensures water is channelled away effectively.
Elevating the Heat Pump
Positioning your heat pump on a raised platform, such as a concrete or composite base, offers several benefits:
- Prevents Water Accumulation: Elevation keeps the unit above potential standing water, reducing the risk of damage.
- Enhances Airflow: Adequate clearance beneath the unit promotes better air circulation, aiding in efficient operation.
Octopus installs your Cosy heat pump in this way so that it operates efficiently, remains free from ice-related issues, and enjoys a longer lifespan.
How long does it take for a house to warm up with a heat pump in winter?
A heat pump gradually warms a home over a few hours, unlike a gas boiler that heats quickly. To maintain comfort, it’s best to leave it running rather than expecting instant heat.
How often should I service my Cosy 6 heat pump?
It’s recommended to have a yearly service to ensure optimal performance. Octopus Energy offers maintenance plans to keep your system in top condition. The paid plan is £9 a month and includes an annual service by Octopus.
Can I use my heat pump if there’s a power cut?
No, heat pumps rely on electricity. If you live in an area prone to outages, consider a battery storage system with whole-house backup. A gas boiler won’t work either without electricty!
Why Now is the Best Time to Switch to an Octopus Cosy 6 or Cosy 9 Heat Pump
🔸 The government is considering removing environmental levies from electricity, which could further reduce heat pump running costs.
🔸 Octopus Energy’s award-winning heat pumps offer top efficiency and are built for UK homes.
🔸 Switching to an Octopus Cosy heat pump is now simpler and more cost-effective with expert installation and smart tariffs.
Final Thoughts
The Octopus Cosy 6 and Cosy 9 Heat Pumps are cost-effective heating solutions for UK winters. While it requires a different approach to heating compared to a gas boiler, it can deliver consistent warmth, lower energy bills, and a smaller carbon footprint.
Want to install an Octopus Cosy 6 Heat Pump? Use my referral code (95460) for priority installation!
Other posts you may find of interest by Sarah;
- Octopus Energy rocketing to the number one energy supplier in the UK.
- Operation Mercury – Smart homes of the future.
- Octopus Cosy 6 and Cosy 9 review.
- Compare Octopus Energy Tariffs.
Quick Links