Cosy Heating
We’ve got three lovely Cosy heat pumps ready to keep you snug: Cosy 6, Cosy 9 Cosy 12.
Our latest arrival, the Cosy 12, extends our award-winning Cosy heat pump line to cover even more homes, delivering comfort and efficiency for larger heating needs.
Curious if Cosy’s right for you? During your free home survey, we’ll measure your heat loss to see which model fits best. If it's not the right fit, we'll match you with the perfect alternative heat pump from Daikin for the same price.
Built to perform. Designed to improve.
Designed and tested by experts to go beyond MCS standards - even in real-world conditions
Cosy keeps getting better, with automatic updates that improve performance, refine how it runs, and add new features over time like Hush Mode
Want to see what others think? Have a peak at our customers' reviews
Tailored installation options
Following an in-home survey, we'll assess your home and recommend the right heat pump setup for you
This includes things like system size, placement, flow temperature, and tariff options
Find out more about what to expect from a heat pump installation
Easy to control, cheaper to run
Following an in-home survey, we'll assess your home and recommend the right heat pump setup for you
This includes things like system size, placement, flow temperature, and tariff options
Find out more about what to expect from a heat pump installation
Support that stays with you
We can remotely monitor, diagnose and update your Cosy system, giving us direct insight into performance
If there's ever an issue, our in-house team can often fix it remotely - and they're always on hand to help
Visit the Cosy heat pump support hub for guides, tips, and help whenever you need it
The Cosy heating system
Cosy is the complete package: a heat pump, hot water cylinder, straightforward controls and up to four Cosy Pods to monitor the temperature and humidity of your home.
Together with our clever Octopus tech, it works effortlessly to warm up your home and hot water up to 4x more efficiently than a gas boiler.
The outdoor unit
The Cosy heat pump is designed to be installed and run incredibly efficiently. Unlike many heat pumps, Cosy uses the new natural refrigerant R290, which is better for the environment.
Hot water cylinder
Sized to suit your home, our hot water cylinders are highly insulated to keep heat loss to a minimum whilst storing your hot water. Made from durable duplex stainless steel.
Cosy Hub
This smart device sends information back and forth from your heat pump to your app. Built with handy light indicators to show connection, heat status and more.
The Octopus Energy App
Control heating and hot water from anywhere. Set schedules, check temperatures, track performance - and switch on Hush Mode if you want things a bit quieter.
Our Cosy heat pumps
Built to last and always improving
An 8 year warranty, plus smart software updates that add new features and improvements over time.
Save with smart tariffs and government grants
You may be eligible for a £7,500 grant, and our smart tariff is designed to help lower your running costs.
Simple control, wherever you are
Easily manage your heating from the Octopus app at home or on the go.
We take care of everything
Designed, installed and supported by Octopus experts in the UK, with 5 star rated customer service when you need us.
Heat pump comparison
| Cosy 6 | Cosy 9 | Cosy 12 | |
|---|---|---|---|
| Heat capacity (-5ºC ambient / 65ºC flow) | 5.2 kW | 8.1 kW | 10kW |
| Heat capacity (-5ºC ambient / 50ºC flow) | 5.6 kW | 8.7 kW | 11.2 kW |
| Minimum power draw | 0.35 kW | 0.50 kW | 0.50 kW |
| Sound power level (operating at 55°C) | 58 dB(A) | 56 dB(A) | 61 dB(A) |
| Sound power level (operating at 65°C) | 59 dB(A) | 57 dB(A) | 61 dB(A) |
| SCOP (designed at 50°C) | 3.4 | 3.6 | 3.9 |
| SCOP (designed at 65°C) | 2.8 | 3.0 | 3.3 |
| Max flow temperature | 70℃ | 70℃ | 70℃ |
| Dimensions (W x H x D) | 855mm x 1125mm x 595mm | 855mm x 1375mm x 595mm | 855mm x 1375mm x 595mm |
| Reheat time for 180L water cylinder (from 10ºC to 48ºC) | ~70 mins | ~45 mins | ~40 mins |
| Reheat time for 300L water cylinder (from 10ºC to 48ºC) | ~125 mins | ~80 mins | ~70 mins |
Frequently asked questions
Cosy 6 is generally suitable for homes with 1-4 bedrooms and heat loss of less than 5.6 kW, while Cosy 9 is generally suitable for homes with 3-5 bedrooms and a heat loss of up to 8.7 kW. Our newest arrival, the Cosy 12 is built for larger or older homes with a heat loss of up to 11.2 kW.
We will check this when taking our usual measurements during your survey. For more information on costs and installation requirements, check out our heat pump FAQs page.
Other considerations:
Do I need a hot water tank?
You'll still need a tank to store the hot water your heat pump makes. The good news is that our installations include a new high-efficiency tank if you don’t have one.
Does the existing system have to be pressurised?
We'd recommend a pressurised system rather than open vented in some cases (the same applies to a boiler though!)
Does it work with microbore pipes?
Cosy heat pumps work with copper or plastic microbore piping 10mm or larger. And our high temperature option opens them up to a broader range of properties. Our Cosy heat pumps can create the same water temps as a gas boiler, so if gas heats your home today it’s very likely that a Cosy heat pump can do it too.
Will the fan get blocked with snow?
We’ve worked closely with the fan manufacturer to ensure the mounting position isn’t affected by snow. In fact, the same designers worked on a RED heat pump model with a fan that sits and works directly upwards, installed across Scotland and Germany without any fan blockage issues.
The Cosy 6 was originally unveiled in a super slick purple, but we're now installing the Cosy models in a dark grey (with it's signature hard-wearing mottled texture).
Heat pumps can save you money:
Cosy heat pump customers on the Cosy Octopus tariff saved an average of £219 last year compared to using a gas boiler running at 85% efficiency on our standard variable tariff.
This figure is based on the actual energy consumption of all Cosy heat pump customers on a Cosy Octopus tariff between 19 March 2025 and 18 March 2026, using tariff rates at the time.
We compared this to the cost of producing the same amount of heat with a gas boiler operating at 85% efficiency, priced using our Flexible Octopus (standard variable) tariff at the same time.
Savings from gas standing charges were included only for customers who had fully removed their gas supply (less than 3% of customers).
Actual savings vary depending on system design, tariff choice, home insulation and energy use.
Built by the UK's most trusted energy supplier
We've won more awards for customer service than anyone else**
Supplied with 5 star customer support**
Octopus Energy has a 5 star rating on Trustpilot**
Heat pump heating makes the air healthier in your home** Homes with a heat pump emit far less harmful nitrous oxide (NOx) emissions from gas boilers and cookers, significantly reducing asthma and other respiratory illnesses. According to the Sustainable Markets Initiative Cleantech homes report.
The Cosy heat pump is quiet
Heat pump sound power levels are verified by an independent, third-party laboratory as part of the testing process for inclusion on the MCS product database. The laboratory verifies the sound power on the A-weighted decibel curve, as A-weighting closely aligns to how humans perceive "loudness". All heat pumps are measured using EN14511 standards to ensure uniformity across manufacturers and models. Our Cosy 6 heat pump has a verified sound power level lower than many other heat pumps of the same capacity.
Ready for your personalised quote?
Whether you’re just curious or have done your homework, getting a quote is a simple, stress-free next step.
Explore before you decide
Are heat pumps worth it?
We’ll show you why they’re clean, efficient, and cheaper to run than old boilers.
Smarten up your energy
Learn about our smart tariffs and how they can help you save while staying cosy.
Crunch your potential savings
Use our savings calculator to see how much you could save by switching to a heat pump.
Cosy heat pump customers on the Cosy Octopus tariff saved an average of £200 last year compared to using a gas boiler running at 85% efficiency on our standard variable tariff
This figure is based on the actual energy consumption of all Cosy heat pump customers on a Cosy Octopus tariff between 1 July 2025 and 1 July 2026, using tariff rates at the time.
We compared this to the cost of producing the same amount of heat with a gas boiler operating at 85% efficiency, priced using our Flexible Octopus (standard variable) tariff at the same time.
Savings from gas standing charges were included only for customers who had fully removed their gas supply (less than 3% of customers). Actual savings vary depending on system design, tariff choice, home insulation, and energy use.
Our typical heat pump price is £4,459, which is lower than the national average of £5,600
This is the median post-survey price from all of our heat pump quotes after the £7,500 Boiler Upgrade Scheme has been applied, between 01/09/2025 and 28/02/2026. The national average is taken from the Boiler Upgrade Scheme statistics: April 2026 – median cost of installation Q4 2025.
Cut carbon emissions by 82% with a heat pump
This is the typical reduction in heating carbon emissions using an electric powered heat pump compared to a gas boiler.
The carbon breakdown
Gas CO2 (tonnes per year) - 2.42
Electricity CO2 (tonnes per year) - 0.43
Carbon saving (tonnes per year) - 1.99
Data sources and assumptions
Gas Energy Usage (kWh) 11500 (Ofgem medium use gas usage (Jun 2026))
Heat Pump Efficiency 312% (typical seasonal coefficient of performance from a fleet of Octopus high temperature heat pumps)
Gas Boiler Efficiency 85% (The typical gas boiler efficiency from a BEIS study)
Gas fuel emissions of (gCO2/kWh) 210 (SAP 10.2)
Electricity fuel emissions of (gCO2/kWh) 136 (SAP 10.2)
Based on these sources, heat pumps typically produce lower operational emissions when heating the home than gas boilers.
For more information, explore our Octopus Cosy heat pump fleet performance dashboard.
We're the largest heat pump installer on the Boiler Upgrade Scheme
Based on Octopus benchmarking against Ofgem reports from 2024, and we've continued to grow since.
Our customers love their heat pumps!
- 93% of people say it's the same or more comfortable than their previous boiler
- 87% say it costs the same to run or less
- 83% say it's the same noise or less than the previous boiler
- 90% say it's just as easy or easier to maintain
We survey all our heat pump customers 3 months post-installation to see how they find their heat pump compared to their previous gas boiler. Survey results are taken from a sample of 2,837 customers:
Comfort: 93% of people say it is the same or more comfortable than their previous boiler.
Running Costs: 87% say it costs the same to run or less.
Noise: 83% say it is the same noise or less than the previous boiler.
Maintenance: 90% say it is just as easy or easier to maintain.
A heat pump is around 4x more efficient than a gas boiler
Heat pumps don't generate heat by burning fuel. Instead, they transfer existing heat into your home. This means they can deliver multiple units of heat for each unit of electricity used.
Based on performance data from a fleet of installed Octopus Cosy heat pumps, typical real-world seasonal performance (SPF or SCOP) is around 3.6. This means around 3–4 kWh of heat is delivered for every 1 kWh of electricity used (an effective efficiency of 300–400%). By comparison, typical UK domestic gas boilers operate at around 85% efficiency, delivering approximately 0.85 kWh of heat per 1 kWh of gas used. On this basis, a heat pump can be around 4× more efficient than a typical gas boiler.
All our heat pumps are independently tested by the Building Research Establishment (BRE), with SCOP values published on the Microgeneration Certification Scheme (MCS) product database. Actual efficiency will vary depending on the property, system design, and usage. For more information, explore our Octopus Cosy heat pump fleet performance dashboard.
The UK's most awarded energy supplier
We've won more awards for customer service than anyone else.
Heat pumps give reliable, consistent heating and hot water
The heat pump user survey report by Nesta from May 2023 summarises that "users are highly satisfied with their heat pumps". It states: "People living in England, Scotland and Wales who own their home and use a heat pump to heat it are satisfied that heat pumps are safe, reliable, quiet heat sources that are effective for space heating and producing hot water." Find the full report here.
The Cosy heat pump is quiet
Heat pump sound power levels are verified by an independent, third-party laboratory as part of the testing process for inclusion on the MCS product database. The laboratory verifies the sound power on the A-weighted decibel curve, as A-weighting closely aligns to how humans perceive "loudness".
All heat pumps are measured using EN14511 standards to ensure uniformity across manufacturers and models. Our Cosy 6 heat pump has a verified sound power level lower than many other heat pumps of the same capacity.
Heat pump heating makes the air healthier in your home
Homes with a heat pump emit far less harmful nitrous oxide (NOx) emissions than those with gas boilers and cookers, significantly reducing asthma and other respiratory illnesses. According to the Sustainable Markets Initiative Cleantech Homes report.
A heat pump can add thousands to your property value
Analysis by the Department of Land Economy at the University of Cambridge suggests a 16% value uplift for new-build homes with enough solar and battery storage to eliminate energy bills. A further study of over five million existing properties indicates a 2-3% value increase for existing homes with solar panels or heat pumps (versus like-for-like gas-heated homes), according to the Sustainable Markets Initiative: Cleantech Homes report, 2024.
As of April 2025, the average house price in the UK is £265,497 according to the Land Registry. Therefore, a 2-3% value increase for an average house priced at £265,497 would be between £5,310 and £7,965.
Heat pumps typically last longer than gas boilers
The expected lifespan of a typical gas boiler is 10–15 years. A heat pump typically has a lifespan of 15–20 years, with UK government research indicating an average of around 20 years. Manufacturer Daikin reports similar ranges. Actual lifespan depends on factors such as installation quality, maintenance, usage patterns, and operating conditions.