Are heat pumps worth it?
Short answer
Heat pumps can be worth it when the system is sized and set up properly. The biggest variables are your home’s heat loss, radiator sizing, flow temperature, electricity tariff and installer quality. A poor design can cost as much as gas, or more. A good design can cut energy use and improve comfort.
Last checked 24 September 2026 · 3 sources
What decides whether a heat pump is worth it?
The heat pump itself is only part of the system. The design around it matters just as much.
A proper survey should calculate how quickly each room loses heat on a cold day. That figure is then used to size the heat pump and the radiators.
Oversizing is not a harmless safety margin. A unit that is too large can cycle on and off more often, which can reduce efficiency. It also costs more and takes up more space.
Radiator sizing matters because heat pumps work best at lower water temperatures than traditional boilers. If the radiators cannot deliver enough heat at those lower temperatures, the system may need to run hotter and use more electricity.
One experienced installer in our source interview put it simply: the relationship between heat demand and radiator size can determine whether a heat pump saves money, breaks even with a boiler, or costs more to run.
Will a heat pump automatically cut my bills?
No. A heat pump is very efficient at moving heat, but electricity usually costs more per unit than gas.
That means the real result depends on system efficiency and your tariff. A well-designed heat pump running at a low flow temperature can perform very differently from one that is oversized, badly controlled or left using an immersion heater unnecessarily.
Flexible or heat-pump tariffs can improve the economics further, especially if you can shift some electricity use into cheaper periods.
Does an older home make a heat pump poor value?
Not automatically. Older homes can use heat pumps successfully when the system is designed around the building.
Insulation can reduce the heat demand and make any heating system cheaper to run. However, Boiler Upgrade Scheme eligibility in England and Wales does not require you to install insulation first.
What about the upfront cost?
Energy Saving Trust currently puts a typical air-source heat pump installation at around £11,000 to £12,000 before grants, depending on the property and the work required.
In England and Wales, the Boiler Upgrade Scheme currently offers £7,500 towards an eligible air-to-water or ground-source heat pump. Some off-gas-grid homes replacing oil or LPG can receive £9,000 until 31 March 2027.
What should I do next?
- Get at least three quotes from MCS-certified installers.
- Ask for a room-by-room heat-loss calculation.
- Ask what flow temperature the system is being designed around.
- Check which radiators need changing and why.
- Compare running-cost estimates using your actual electricity tariff.
Sources
- Energy Saving Trust, Air source heat pumps: costs, savings and benefits, last updated 16 July 2026.
- Ofgem, Boiler Upgrade Scheme — Property owners, checked 24 September 2026.
- Source interview with Heat Geek installer, especially the sections on heat-loss calculations, radiator sizing and controls.
Last checked: 24 September 2026