Cosy, green & cost effective heat pumps
Upgrade to the Cosy heat pump - the smart choice for greener, cheaper heating. Save £7,500 with a government grant (check eligibility), and get a free 8-year warranty.
Upgrade to the Cosy heat pump - the smart choice for greener, cheaper heating. Save £7,500 with a government grant (check eligibility), and get a free 8-year warranty.
Introducing the Cosy heat pump
Easy to control, cheaper to run.
Manage your home heating from anywhere with the Octopus app. Customers on our 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. See how we calculate savings.
Top-tier tech.
Highly-insulated hot water cylinders, eco-friendly refrigerant, and Cosy Pods that fine tune temperature and humidity.
A heat pump that gets smarter.
Cosy isn't like most heat pumps: it's unique. Just like your smart phone, Cosy gets regular software updates and exciting new features - no matter how long you've had it. Find out more about what makes Cosy great.
The heat pump is a game changer.
With gas, we had to switch the heating on and off frequently to save energy. The Cosy keeps the house consistently warm without needing constant adjustments.
Luis, Cosy Heat Pump owner
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Next steps to cosy living
With £7,500 off the installation cost for eligible homes with the Boiler Upgrade Scheme and flexible ways to pay, there's never been a better time to switch.
1. Explore costs
Pop in your postcode and give us a few details about your home.
2. In-home survey
One of our heat pump specialists will take some measurements and design your new heating system.
3. Design and install
We'll send a detailed plan for design and install - then get ready for greener, cheaper energy!
Why choose Octopus?
We manage it all,
from design to install
Radiator upgrades, pipes, electric work: all sorted with no third parties involved.
Expert tech for
hassle-free heating
Control heating in the Octopus app, and get new features with Cosy software upgrades.
All your support and
aftercare covered
8 year guarantee for ultimate peace of mind, plus support 7 days a week.
Explore more on heat pumps
How much does a heat pump cost to run?
Discover more Octopus smart home tech
One stop shop for all things heat pump
Frequently asked questions
Ready to learn more? See our full list of FAQs here
To claim the grant, you'll need to:
- Own your home. The grant is only available to homeowners.
- Have an Energy Performance Certificate from the past ten years. Don't have one? No worries - we can arrange that for you.
- Make sure there's enough space for your new system. Our sizing guide can help you check.
- Complete any renovations first. If your home is being renovated, you'll need to wait until it's finished. In the meantime, we have some tips to help you get ready.
For the full details, visit our Boiler Upgrade Scheme page.
Together with your new air source heat pump, your quote will include:
- Installation & configuration by our expert team.
- Any necessary radiators.
- Plumbing & electrical bits needed to fit your new heating system.
- All delivery and labour required to complete the install.
- 8-year product warranty with a Cosy or Grant Aerona heat pump, or 5-years with a Daikin heat pump.
- £7,500 Boiler Upgrade Scheme grant for eligible homes (we apply on your behalf).
- Free asbestos testing and Energy Performance Certificate (EPC) application if required.
- 2-year warranty on all other parts.
- 5-year warranty on labour & workmanship.
- A dedicated team to support with everything, from quote to installation and beyond.
- All work is completed to our design standard. If your home requires any extra work, this may come at an additional cost.
Our quote includes everything you need for an efficient, MCS-quality heat pump install. If you want extra bits (for example, extra radiators, a water cylinder upgrade, or solar diverter), it will cost more. We'll discuss all of the potential options after the survey.
During your survey, we will check whether any other work is required to get your home heat-pump-ready. The cost of these works is not included in your quote, but we'll provide support to ensure everything gets sorted. We've included some further information on what may incur additional costs below:
- Groundworks or site preparation. Any work required to prepare the areas where the heat pump and/or cylinder will go.
- Asbestos removal.If necessary, asbestos testing is included in your quote. But if we find asbestos, we are unable to remove it for you, instead we will put you in touch with someone who can. Then a clean air test will be required before we proceed.
- Planning permission.Around 40% of customers need planning permission. These costs can vary depending on where you live, but the application fee is typically £250 - £330.
- Scaffolding.About 30% of homes require scaffolding in order to do the installation safely. This can cost between £800 - £1,000, depending on your home.
- Structural surveys or loft upgrades. If the cylinder is to be installed in a loft, we will require a structural survey before we proceed.
- Fuse or service upgrades. Your local Distribution Network Operator may recommend that upgrades are completed before installation.
- Installation upgrades. If you would like extra bits beyond our standard design, like a water cylinder upgrade, or a solar diverter, this will cost more. Extra radiators will also cost more and we only install Octopus-supplied hardware.
We're not able to install in properties without existing plumbing, or if the plumbing needs to be fully replaced or re-piped to be heat pump ready. If this sounds like you, please email us at heat@octopus.energy and we can refer you to one of our Octopus Trusted Partners.
Making home improvements is really exciting, and a heat pump could be the icing on the cake! If you're planning to make structural changes (like knocking down a wall or adding an extension), you will need to wait for the renovation to be complete before we can begin designing your heat pump.
This is because big changes will alter the overall heat loss and thermal performance of your property. We tailor your heat pump design specifically to your home, so if the layout changes, the needs of your heat pump will too. This means your heat pump may end up being too small or less efficient, and cost you more money in the long run. Your heat pump may also no longer meet MCS requirements, which is needed for the government grant.
However, there are some things you can factor into your renovation plans now to get your home heat pump ready:
- Underfloor heating/ radiators - underfloor heating is the perfect partner for heat pumps or larger, higher output radiators to accommodate the lower flow temp. Just let your contractor know you're planning to match it with a heat pump and they'll find the right emitters for you.
- Pipework - you'll need a minimum pipe size of 15mm for a conventional heat pump. If you have smaller pipes, they can still work well but you may need a more bespoke system.
- Space - think about where you'll be placing your heat pump (outside) and water cylinder (inside) - the closer together, the better!
- Insulation - renovation can be a prime time to add more insulation to your property, which will make your heating more efficient (whatever system you have)
Please get back in touch once your renovation is structurally complete and we'll be happy to give you a heat pump quote.
Our typical heat pump price is £4,459 which is lower than the national average of £5,931. 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 the 1 September 2025 and 28 February 2026 compared to the national average shown in Boiler Upgrade Statistics: January 2026 - median cost of installation Q4 2025.
The quickest way to find out how much a heat pump will cost for you is to get a quote. We ask for a few quick details, and use this together with other clever data sources, such as your home's Energy Performance Certificate (EPC) and energy usage, to calculate your estimated cost.
We'll be able to let you know exactly what you need and how much it costs, including necessary additional works after your no obligation home survey. Find out more about potential additional costs in the Cost, grants and savings section.
Can I pay for my heat pump on finance?
You can pay in one go or spread the cost with monthly payments. If you'd like to pay on finance, we can connect you with Novuna who can arrange loans between 5 and 10 years, subject to status and affordability. Explore finance options.
Heat pumps vs Gas boilers
Cost to run: 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 typical UK 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.
Efficiency: 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 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.
This comparison is based on typical real-world performance of Octopus Cosy heat pumps and typical UK domestic gas boilers. Actual efficiency will vary depending on the property, system design, and usage.
For more information, explore our Octopus Cosy heat pump fleet performance dashboard.
Lifespan: 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.
Emissions: Cut carbon emissions by around 80% with a heat pump
A typical medium-use home could reduce operational heating carbon emissions by around 85% using an electric powered Octopus Cosy heat pump compared to a typical UK domestic gas boiler, depending on factors like home efficiency, system design and usage, based on the following calculation:
Gas CO2 = (A*D) = 2.42 tonnes per year
Electricity CO2 = (A/B*C*E) = 0.37 tonnes per year
Carbon saving = 2.05 tonnes or 85%
Where A - E are:
A - 11,500 Ofgem gas consumption values for a typical medium-use home
B - 360% typical seasonal coefficient of performance from our fleet of Octopus Cosy heat pumps
C - 85% typical gas boiler efficiency from a BEIS study
D - Gas fuel emissions of 210 gCO2/kWh (SAP 10.2)
E - Electricity fuel emissions of 136 gCO2/kWh (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.
General heat pump claims
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.
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.
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 Land Registry. Therefore, a 2-3% value increase for an average house priced at £265,497 would be between £5,310 and £7,965.
UK's most awarded energy supplier
Octopus Energy are proud to have won over 100 awards - recognising our green innovation, fast growth, amazing customer service, affordability and more. Building our own technology from the ground up has revolutionised the way we are able to operate as an energy provider. It's energy but simpler, greener and more transparent, and it's officially earned us the title of the UK's most awarded energy supplier.
We're here to help
Interested in heat pump installation?
Call us: 0808 196 6842
Email: heat@octopus.energy
(Our phone lines are open 9am - 5pm Monday to Thursday, and 9am - 4pm Friday)
Need support after installation?
Call us: 0808 196 6842
Email: heat@octopus.energy
(Our aftercare phone line is open 8am – 8pm Monday to Saturday, 10am - 6pm Sunday, and we answer emails 7 days a week)
Have a complaint?
For the fastest response, fill out this form to raise any issues. Alternatively, you can email us on heat@octopus.energy or call 0808 196 6842.
Check out our full complaints procedure.
Heat pump installation terms and conditions
Public liability insurance provider: QBE UK Limited.
Indemnity Limit: £10 million
Octopus Energy Services Ltd VAT number: 358672751