Air source heat pumps. Start saving with a low carbon heat pump

Go greener with an air source heat pump, the low-carbon future of home heating. And thanks to a government grant of £7,500 and our exclusive energy offer they’re now more affordable than ever. And with our Warm Home Promise, you can be sure they’ll heat your home as brilliantly as a gas boiler.

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Save up to £368 with a heat pump and exclusive energy offer5

Switching to a heat pump can help cut your annual energy bills – and choosing British Gas for installation could save even more. You’ll qualify for our heat pump energy offer, which gives you a discounted rate of just 14p per kWh on electricity your heat pump uses in the next 12 months6.

Why replace your boiler with a heat pump?

Greener, cleaner heat

Air source heat pumps only use electricity, so they’re a low-carbon way of keeping your home warm.

Built to last

You can expect a heat pump to last for 20+ years – longer than the average lifespan of a gas boiler.

Government grant

Homeowners in England, Wales and Scotland can claim a £7,500 grant.1

Warm Home Promise

Heating you'll love - guaranteed

We know changing to a new kind of heating might seem like a big move, so our Warm Home Promise is there to give you total peace of mind.

Our engineers will only install a heat pump if we’re confident it’ll heat your home as well as a traditional boiler.

We’ll design your new heating system to reach the right temperature for your home. And if it doesn’t, we’ll come to put things right – or give you your money back. 2

How much does a heat pump cost?

From £499 with a £7,500 government grant​.

Personalised fixed-price quote

The exact cost of an air source heat pump will depend on whether any extra work is needed to upgrade your home’s insulation, pipework and radiators. Once we know that, we’ll give you a personalised fixed-price quote that covers everything.

Spread the cost

If you don’t want to pay everything immediately, we offer a range of payment options – including 0% interest over 2 years.3

Our price match guarantee

We’re confident you won’t find a better price for your heat pump. But if you do, let us know – we’ll match the quote for any like-for-like installation.4

Calculate your running costs

Answer a few questions in our handy tool to see what a heat pump will mean for your energy bills.

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How an air source heat pump works

Air source heat pumps are the amazing low-carbon alternative to gas boilers.

They work a bit like a fridge-freezer, but in reverse. The clever technology uses electricity to take warmth from the air outside – even when temperatures get as low as -15C!

Heat pumps are the greener way to supply your home’s heating and hot water. They give you all the comfort and convenience of a boiler, but with fewer CO2 emissions.

Three steps to installing a heat pump in your home

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Tell us about your home

Answer a few questions and one of our experts will call you to talk through whether your home is suitable.

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Your home survey

One of our highly trained surveyors will visit your home and – if a heat pump is right for you – give you a fixed-price quote.

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Heat pump installation

It usually takes about a week for our engineers to install your heat pump, including any changes to pipework and radiators.

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Air source heat pumps explained

FAQs answered by a British Gas Surveyor

Why buy a heat pump from British Gas?

Free home survey

One of our experts will make sure your home is 100% suitable for an air source heat pump – and  answer any questions.

Industry-leading aftercare

We offer a free check-up visit to make sure everything’s working perfectly after installation. Plus a year’s free service cover in case you ever need us.

5-year warranty

If you have any problems, we’ll be there to help. Just make sure to get an annual service to keep your heat pump in tip-top condition.

Free first service

For extra peace of mind in your first winter, we’ll check your heat pump is working as it should before the cold weather hits.

MCS accredited supplier

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What our customers think of us on Trustpilot

Recently got a heat pump installed by British Gas. They were great at communicating – and I had a chance to inspect and request finishing touches. All in all, 10 out of 10!


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The engineer did a complete survey to see if a heat pump would suit our property. And rather than mis-selling, he offered an alternative option better suited to us. Thank you.


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Air source heat pump guides

How are heat pumps installed?

Learn more about how heat pumps are installed and factors to consider when looking to get a heat pump for your home.

Learn more

Air source heat pump costs

Find out more on the costs involved in getting a heat pump installed in your home.

Find out more

What size heat pump do I need?

Discover what impacts the size of a heat pump and how to calculate what size heat pump is right for your home.

Discover more

Heat Pump Grants

Lean more about the different types of Heat Pump grants, eligibility, and application process. Get started on energy-efficiency heating today.

More information

Differences between heat pumps and boilers

Explore the differences between heat pumps vs boilers to find your best heating solution.

Explore more

Pros and cons of an air source heat pump

Air source heat pumps can be a green and cost-effective way of heating your home – but they’re not right for everybody and every building.

They work best when your home is energy efficient, which means you might need to make some improvements to your insulation.

You might need some changes to your pipework and radiators too. But don’t worry – we’ll tell you what’s needed before starting work and your price will include any extra work

And if you’re not quite ready to make the switch to an air source heat pump just yet, why not check out our range of A-rated boilers instead?

Find out more

Frequently Asked Questions

What government grants are available for air source heat pumps?

From October 2023, the government’s Boiler Upgrade Scheme gives homeowners in England and Wales a £7,500 grant towards the cost of a heat pump.​

For homeowners in Scotland, The Home Energy Scotland grant gives £7,500 towards the cost of an air source heat pump – plus a potential £1,500 extra if you live in a rural area.​

Applying for the grant couldn’t be simpler. British Gas will do all the paperwork for you and include the grant as a discount on the price you pay.

How long do air source heat pumps last?

You can expect an air source heat pump to last for 20 years or more. Because they’re based on a relatively simple and reliable technology, heat pumps don’t need a lot of maintenance – although an annual service is recommended.

Do air source heat pumps work in very cold weather?

Yes. Air source heat pumps work effectively even when outside temperatures are -15°C, although they are a bit more energy efficient at warmer temperatures.

Are air source heat pumps expensive to run?

The only fuel needed to run ASHP heating is electricity. The amount of electricity required depends on the size of your home and also the quality of your insulation. The better the insulation, the less heat your home will lose – and the less energy will be needed to operate the heat pump. A heat pump in a well-insulated home should be cheaper to run than a traditional gas boiler.

What are the different types of heat pump?

There are two types of heat pump: air source heat pumps (which we install) and ground source heat pumps (which we don’t). As the names suggest, ground source heat pumps get heat from the ground, while air source heat pumps get it from the outside air. Ground source heat pumps are generally trickier to install and require much more outside space, while air source heat pumps are suitable for a larger range of properties. You can get more detail on the differences between the two types of heat pumps in this article by the Energy Saving Trust.

How much space do I need for an air source heat pump?

An air source heat pump looks a bit like an external aircon unit. It’s installed outside your property and needs a solid base to sit on. It needs about 3m x 2m for the unit itself, plus enough space around it to achieve good airflow.

What are the disadvantages of air source heat pumps?

If your home is well insulated, an air source heat pump is an energy-efficient, economical, and low-carbon way of heating your home. However, not all homes are suitable for heat pumps. If a lot of heat escapes through your walls, roof, doors and windows, the heat pump will need a lot of electricity to generate enough heat – which could mean you end up spending more on heating than you would with a traditional gas boiler.

Why do I need to change pipework and radiators for an air source heat pump?

Air source heat pumps keep your home warm by producing steady amounts of lower heat, rather than quick bursts of high heat. Heat pumps generate heat between 35°C and 55°C, whereas for a gas boiler this is between 70°C and 80°C. Your installation team will look at your current central heating system and let you know if you need to make any upgrades to get the best performance from your heat pump. For example, one common change is to install bigger radiators so that there’s more surface area for the lower heat output.

Is ASHP heating noisy?

No, a heat pump only generates around 50 decibels, which is about the same as a gas boiler or a fridge freezer. And because they’re outside, you probably won’t notice anything inside your home. If your heat pump does start making loud noises, it’s probably a sign that something needs fixing!

What is the heat pump energy offer?

It’s exclusive to customers that purchase a heat pump with British Gas, discounting heat pump electricity consumption to 14p per kWh for 12 months6

How do I get the heat pump energy offer?

We will email qualifying customers once your installation is complete with a link to sign up for the heat pump energy offer.

Important documents

Terms and conditions for Heat Pumps Warm Home Promise

Additional information

  1. To be eligible for the grant, a valid, non-expired Energy Performance Certificate (EPC) with no recommendations for cavity wall or loft insulation is required. In March 2022, the government announced a removal of VAT on domestic energy-saving measures, including heat pumps. This will last for five years from 1st April 2022. In September 2023, the government increased the grant available to homeowners in England and Wales installing an air source heat pump from 31/10/2023 to £7,500.

  2. Terms and Conditions apply (PDF 43kB)

  3. British Gas acts as a credit broker, not the lender and offers products from a panel of lenders. Payment options are subject to change without notice. British Gas is a trading name of British Gas New Heating Limited (No. 06723244), an appointed representative of British Gas Services Limited (No. 03141243) which is authorised and regulated by the Financial Conduct Authority (Financial Services Register No. 490568). Both companies registered in England and Wales. Registered office: Millstream, Maidenhead Road, Windsor, Berkshire SL4 5GD. Availability of credit depends on status and credit checks. Terms and Exclusions apply.

  4. Price is dependent on a full quote from another MCS-accredited heat pump installer for a like-for-like installation. We reserve the right to refuse a price match if we think the quote and design specification isn’t suitable for your home.

  5. Up to £196 energy saving: Based on medium household consumption (11,500 kwh annual usage) and no gas used for cooking vs SVT price cap (July 2024).

    Up to £57 saving vs D-rated boiler: Based on medium household consumption vs. British Gas heat pump installation with 350% efficiency.

    Up to £115 Standard charge saving: 95% of our installations make the property gas free. On average, a £115 annual saving is possible by capping a gas meter, removing the standing charge.

  6. Heat Pump energy offer only available on installations purchased before 30th September 2024. Discounted rate of 14p per kWh for heat pump consumption applies for 12 months. Discount excludes standing charge. For time of use tariffs discount applies to peak rate consumption only. Discount applied to next bill as a credit. Must be new energy platform, direct debit, customer. Electricity account must be registered at the same address as your heat pump installation. Smart meter required.