What do I need to consider when changing a Boiler to an Air Source Heat Pump?

You can’t just replace a boiler with an air source heat pump and expect it to work properly.


You need to start by carrying out a heat loss calculation for the property and advise the homeowner of any improvements that need to be made to insulation, windows and doors. This would improve the heat loss calculations and make it more efficient to heat the home with an air source heat pump.


If there isn’t already a hot water storage cylinder, you will need to install one, and if there is a cylinder in place, it may need changing, as an air source heat pump cylinder has a much larger coil inside to allow for better heat transfer and better reheat times.

Our Air Source Heat Pump Solutions

Baxi HP40 Monobloc Air Source Heat Pump

Baxi HP40 Monobloc Air Source Heat Pump

Our range of Baxi Air Source Heat Pumps are available individually or with our Baxi Air Source Heat Pump Cylinders to provide a complete solution that delivers reliability and energy-efficient performance.

Baxi Air Source Heat Pump Cylinder

Baxi ASHP Cylinder

The Baxi Air Source Heat Pump Cylinder has been specially designed and manufactured in the UK by Baxi and Heatrae Sadia experts.

Baxi £500 Heat Pump cashback promotion

You can earn £500 per installation for qualifying Baxi HP40 Air Source Heat Pumps when they are installed, commissioned, and registered on Baxi Works with a valid MCS Installation Certificate by 30th April 2026.*

Success Stories

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Self-build homeowners enjoy winter of comfort with Baxi Air Source Heat Pump

Having moved into their self-build Suffolk home in December, Emma and Jonathan Hayes have spent five months living with a Baxi air source heat pump (ASHP). The couple have given their account of what life has been like with a heat pump and the benefits of the solution for their home.

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16 Passivhaus Social Homes benefit from Baxi Heat Pump Service

A development of 16 social homes designed and built to achieve Passivhaus standard has been constructed in Dalbeattie, Dumfries & Galloway, with the support of Baxi and our air source heat pump solutions and services.

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Baxi Air Source Heat Pumps chosen for Cambridgeshire new build development

Baxi Assure Air Source Heat Pumps (ASHPs) and Baxi Assure ASHP cylinders have been installed in six new build, off-gas grid houses in Wilburton, Cambridgeshire to provide reliable, future-proof, lowcarbon heating and hot water.

Related FAQs

What is the Boiler Upgrade Scheme (BUS)?

Find out what Boiler Upgrade Scheme (BUS) is and how it works at Baxi FAQs section...

Do I have to be F-Gas certified to fit an Air Source Heat Pump?

Monobloc style air source heat pumps contain a hermetically sealed refrigeration circuit and do not require F-Gas certification to install.

Do I have to be Gas Safe registered to install an Air Source Heat Pump?

A competent knowledge in plumbing and heating is all that is needed as a prerequisite for the NVQ Level 3 Heat Pump Installation qualification. Read more...

What is the Boiler Upgrade Scheme (BUS)?

Find out what Boiler Upgrade Scheme (BUS) is and how it works at Baxi FAQs section...

Why such a big push to install Air Source Heat Pumps now?

Find out why there is such a big push to install Air Source Heat Pumps now...

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