Heat Pump Cost Calculator for UK Homes
Find out if a heat pump is right for your home and how much you could save
How Our Heat Pump Calculator Works
Our free heat pump cost calculator estimates the right system size, installation cost, running costs, and annual savings for your UK home. Enter your property details, current heating system, and preferences to receive a personalised estimate in under two minutes.
The calculator uses your property size, insulation level, and heating fuel to estimate heat loss and recommend an appropriately sized air source heat pump. Results include estimated installation cost, annual running costs compared to your current system, potential savings, BUS grant eligibility, and carbon reduction figures.
Sizing & Capacity
Get a recommended heat pump size (kW) based on your home's heat loss. Undersized systems struggle in winter; oversized systems waste money. Correct sizing is essential.
Cost & Grant Info
See estimated installation costs and check your eligibility for the £7,500 Boiler Upgrade Scheme (BUS) grant. Costs range from £8,000 to £18,000 before the grant.
Savings Comparison
Compare running costs against your current gas, oil, or LPG system to see how much you could save each year on heating and hot water bills.
Want to learn more about heat pumps before calculating? Read our air source heat pump reviews and buying guide. Ready to find an installer? Browse trusted heat pump installers near you. Considering solar too? Try our solar panel calculator.
Frequently Asked Questions
How much does an air source heat pump cost in 2026?
An air source heat pump costs between £8,000 and £18,000 fully installed in the UK in 2026. This includes the heat pump unit, hot water cylinder, controls, and installation labour. The Boiler Upgrade Scheme (BUS) provides a £7,500 grant, reducing the net cost to £2,500-£10,500 for most homes.
What size heat pump do I need?
The right size depends on your home's heat loss, which is determined by property size, insulation, and window quality. A well-insulated 3-bed semi typically needs a 5-8kW unit, while a larger detached house may need 10-16kW. Our calculator above estimates the correct capacity based on your property details.
How much can I save with a heat pump?
Savings depend on your current heating fuel. Replacing an old gas boiler, you can save £200-£600 per year. Switching from oil saves £500-£1,200 per year, and from LPG £800-£1,500 per year. These systems are 300-500% efficient, producing 3-5 units of heat for every unit of electricity consumed.
Am I eligible for the Boiler Upgrade Scheme grant?
You may be eligible for the £7,500 BUS grant if you own the property (or are a landlord), live in England or Wales, have a valid EPC, and are replacing a fossil fuel heating system (gas, oil, or LPG). New builds and social housing are not eligible. The scheme runs until March 2028.
How long does a heat pump take to pay back?
With the £7,500 BUS grant, most systems pay back within 5-10 years. Without the grant, payback is 10-15 years. The period is shorter if you are replacing oil or LPG heating, or if your home is well-insulated. A well-maintained unit lasts 20-25 years.