FAQ
What is an air source heat pump?
An air source heat pump (ASHP) is a low-carbon heating system that extracts heat from the outside air and uses it to heat your home and hot water. It works efficiently even in cold UK weather and is a key part of the UK’s move away from gas boilers.
How does an air source heat pump work?
The system absorbs heat from the outside air, compresses it to raise the temperature, and then transfers that heat into your home via radiators, underfloor heating, or a hot water cylinder. It uses electricity but produces far more heat energy than it consumes.
Are air source heat pumps efficient in the UK climate?
Yes. Modern air source heat pumps are designed to work efficiently in UK conditions, including winter temperatures. They can deliver 3–4 units of heat for every unit of electricity used.
Will an air source heat pump work in my home?
Most UK homes are suitable, particularly if they are well insulated. Heat pumps perform best in properties with:
- Good loft and wall insulation
- Larger radiators or underfloor heating
- A hot water cylinder
- A home survey is required to confirm suitability and system size.
Can an air source heat pump replace my gas boiler?
Yes. An air source heat pump can fully replace a gas, oil, or LPG boiler and provide heating and hot water for your home.
How much does an air source heat pump cost in the UK?
Typical installation costs range from £7,000 to £14,000, depending on the size of your home and any heating system upgrades required.
Is there a government grant available in the UK?
Yes. Homeowners in England and Wales can apply for the Boiler Upgrade Scheme (BUS), which provides a £7,500 grant towards the cost of installing an air source heat pump. Scotland and Northern Ireland have their own support schemes.
Are air source heat pumps expensive to run?
Running costs depend on electricity prices, insulation, and how the system is used. In well-insulated homes, heat pumps can be cheaper to run than oil, LPG, or direct electric heating, and comparable to gas.
Do air source heat pumps work in cold weather?
Yes. Air source heat pumps continue to work efficiently even in sub-zero temperatures and are widely used across Europe and Scandinavia.
Do I need planning permission in the UK?
In most cases, air source heat pumps fall under permitted development and do not require planning permission. Exceptions may apply for listed buildings or properties in conservation areas.
How long does installation take?
Most installations take 2–5 days, depending on your existing heating system and whether radiator or pipework upgrades are required.
Are air source heat pumps noisy?
No. The outdoor unit is quiet — typically around 40–60 decibels, similar to a fridge or gentle conversation. Installers follow UK noise regulations when positioning units.
Can I keep my existing radiators?
Sometimes. Many UK homes need larger radiators to operate efficiently at lower temperatures. This will be assessed during your home survey.
Do air source heat pumps provide hot water?
Yes. Heat pumps work with a hot water cylinder to provide reliable hot water for baths, showers, and taps throughout your home.
What maintenance is required?
Maintenance is minimal. An annual service is recommended to keep the system running efficiently and to maintain manufacturer warranties.
How long do air source heat pumps last?
With regular servicing, an air source heat pump typically lasts 15–20 years.
Are air source heat pumps environmentally friendly?
Yes. Air source heat pumps produce far fewer carbon emissions than gas or oil boilers, especially as the UK electricity grid continues to decarbonise.
Is an air source heat pump right for me?
If you’re looking to reduce carbon emissions, future-proof your home, and potentially lower running costs, an air source heat pump is an excellent option. A professional assessment will confirm whether it’s right for your property.
How much will a new boiler save me?
Old boiler rating | Semi-detached house | Detached house | Detached bungalow | Mid terrace house | Mid floor flat |
G ( < 70%) | £540 | £840 | £445 | £420 | £100 |
F (70–74%) | £380 | £590 | £310 | £290 | £70 |
E (74–78%) | £335 | £460 | £275 | £260 | £60 |
D (78–82%) | £305 | £375 | £250 | £235 | £55 |
These are estimated figures based on installing a new A-rated condensing boiler with a programmer, room thermostat and thermostatic radiator controls (TRVs) in a gas-heated home from an older boiler with a programmer and room thermostat. Savings will vary depending on the size and thermal performance of your home. Figures are based on fuel prices as of March 2019.