Action Surrey: Surrey's Low Carbon Community

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Renewables: Air Source Heat Pump

Before you read on: Replacing mains-gas heating with an Air Source Heat Pump is highly likely to increase your energy bills. Replacing other fuel types can reduce energy bills, however a home must be well-insulated, and consideration should be given to the cost of radiator replacement.

Air source heat pumps take heat from the outside air and use it to heat radiators or underfloor systems. They can function even when external temperatures are as low as -15C and provide both heat and hot water in the home.

Having a heat pump could eliminate the need for a traditional boiler because they run on electricity. However, bills may increase, so it's important to check expected savings. If run on renewable energy, they can be very environmentally friendly.

Is your home suitable?

  • Check whether you need planning permission for ground source heat pumps, to check contact your local council's planning department.
  • Ensure that the walls and roof are well insulated before installing your air source heat pump to work efficiently.
  • You will need somewhere to put the unit outside the property, preferably against an open, south-facing wall.
  • Although they can work with radiators, the technology usually works best when using underfloor heating. Radiators will need to be upgraded to larger ones.
  • Consider the fuel you are replacing and the costs vs savings.

Financial help

The RHI scheme has now closed. The Boiler Upgrade Scheme (BUS) can provide up to £5,000 towards the cost of installation.

For more information contact Action Surrey on 0800 783 2503 or email

Alternatively, fill out our enquiry form online and one of our advisors will get in touch.

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*All figures are taken from the Energy Saving Trust April 2019 figures