Cut carbon emissions by around 80% with a heat pump:

This is the typical reduction in heating carbon emissions using an electric powered heat pump compared to a gas boiler, based on the following calculation:
Gas CO2 = (A*D) = 2.42 tonnes per year
Electricity CO2 = (A/B*C*E) = 0.40 tonnes per year
Carbon saving = 2.01 tonnes or 83%

Where A - E are:
A - 11,500 Ofgem medium gas usage
B - 330% typical seasonal coefficient of performance from a fleet of Octopus low temperature 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)

These are typical install efficiencies for gas boilers and low temperature heat pumps installed in real homes (like Cosy Eco). See our heat pump savings blog for the full set of calculations and assumptions.

Efficiency / A heat pump is up to 4x more efficient than a gas boiler:

Octopus Cosy heat pumps can deliver several units of heat for each unit of electricity. For every 1 kWh of electricity you put in, you could get an average of 3.3kWh heat out, which is an efficiency of 330%! All our heat pumps are tested independently by the Building Research Establishment (BRE) and their energy efficiency ratings, called Seasonal Coefficient of Performance (SCOP), are publicly available on the Microgeneration Certification Scheme (MCS) product database. When we design a system, we design to a 3.4 SCOP in-situ standard.

Heat pumps don't create heat, but move existing heat from nature into your home (like an air conditioner or refrigerator, but in reverse). When you burn stuff to generate heat (like gas, oil, or wood), you are instead creating heat by converting matter to energy - so you can never get more than one unit of heat for each unit of energy you burn. Gas boilers in UK homes are only around 85% efficient, so for every 1 kWh of gas you put in, you get around 0.85kWh of heat out, which is nearly 4x less efficient than a heat pump.

These are typical install efficiencies for gas boilers and low temperature heat pumps installed in real homes (like Cosy Eco). See our heat pump saving blog for the full set of calculations and assumptions.

Heat pumps vs gas boilers

Lifespan: the expected lifespan of a gas boiler is 10-15 years. A heat pump lifetime is typically 20 years based on a UK government study. Various research from brands such as Carrier and Daikin have also found that a heat pump lifespan is typically between 15 to 20 years.
Heating costs: Based on a high temperature air source Octopus heat pump. Check out our blog on heat pump running costs for a full breakdown of our running cost calculations.
Efficiency & emissions: See above

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.

Homes with a heat pump have cleaner air

Research shows that using a heat pump to power heating and cooking emits less harmful nitrous oxide (which has been identified in the report as a contributor to asthma and other respiratory illnesses) when compared to using a gas boiler for this. For more info see Sustainable Markets Initiative Cleantech homes report.

Our customer testimonials:

Customer testimonials are from Octopus Energy's survey of heat pump customers, conducted in January 2025

Save around £370 a year with a heat pump compared to a gas boiler

We expect a medium use home to save around £368 a year, running a Cosy Eco heat pump on our Cosy Octopus 12 month fixed tariff with no gas supply, compared to a gas boiler on a standard tariff. See the our heat pump savings blog for full details and calculations.

The UK's most awarded energy supplier

We've won more awards for customer service than anyone else.

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.

We're the largest installer (No.1) on the Boiler Upgrade Scheme, in England and Wales

*Based on Octopus benchmarking volume of installs against Ofgem reports from 2024, and we continue to grow.

To claim the BUS grant, you'll need to check off the following:

• You'll need to own your home.
• You'll need to have an EPC from the past 10 years. If you don't, no worries, we can arrange that for you.
• You'll need to check you have enough space for your new system. Check out our sizing guide here.
• If your home is undergoing renovation you'll need to wait until it's complete. In the meantime, here are some tips to help you on your way.

To find out more about the Boiler Upgrade Scheme check out this 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 heat pump, or 5-years for other brands.
• £7,500 Boiler Upgrade Scheme grant (we apply for this grant 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.

Get the full low-down on what's included.

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 £3,818 which is lower than the national average of £5,295. This is the median post-survey price from all of our heat pump quotes, between June and September 2025 compared to the national average shown in Boiler Upgrade Statistics: July 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.

Call us: 0808 196 6842

Email: heat@octopus.energy

(Our phone lines are open 9am - 5pm Monday to Thursday, and 9am - 4pm Friday)

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)

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 here.