Independent. Not affiliated with GOV.UK, Ofgem, MCS or any installer.
Independent. Not affiliated with GOV.UK, Ofgem, MCS or any installer.
A typical air-to-water range, the grant for the fuel you choose, and the balance. Ground source and air-to-air stay blank on price until there is a checked source.
Send the country, the fuel and the heat pump type. The form emails this site. It does not name an installer.
Before grant
£10,000 to £16,000
Grant used here
£7,500
After grant
£2,500 to £8,500
The air-to-water band sits around Energy Saving Trust’s typical figure of about £12,000 and the average Boiler Upgrade Scheme air source cost of £13,431 for October to December 2025, as reported by Which?. It is not split by bedroom count.
Energy Saving Trust · Which? · Grant values. This is a guide, not a decision. Your installer applies and Ofgem decides.
How we calculateEnergy Saving Trust’s typical air source figure is about £12,000. The standard grant is £7,500. Subtracting one from the other is an illustration of the published numbers, not a price for a particular house.
Typical before grant
£12,000
Energy Saving Trust air source figure
Standard grant
£7,500
Mains gas, coal or electric, air-to-water
Balance on that figure
£4,500
Before any extra work the survey finds
The wider band used by the estimator is £10,000 to £16,000 before the grant, so the balance after £7,500 sits around £2,500 to £8,500. Which? reports an average scheme air source cost of £13,431 for October to December 2025, which would leave £5,931 after the same grant.
The grant is a fixed amount for a category of heat pump and fuel. The balance is whatever the installer quotes, minus that grant if Ofgem pays it. This page only does that subtraction for air-to-water, because that is the type with a checked cost band.
The method is set out on the how we calculate page. The grant rows themselves are on the Boiler Upgrade Scheme guide.
The same £10,000 to £16,000 band is used for every fuel. Only the grant changes.
| Before grant | £10,000 to £16,000 |
| Grant | £7,500 |
| After grant | £2,500 to £8,500 |
Mains gas, electric, and coal air-to-water or ground source.
| Before grant | £10,000 to £16,000 |
| Grant until 31 March 2027 | £9,000 |
| After grant | £1,000 to £7,000 |
Oil or LPG replaced by air-to-water or ground source. Air-to-air does not use this row.
Each row starts from the £12,000 Energy Saving Trust figure. Air-to-air has a grant and no install price on this site.
| Replacement | Grant | Balance on £12,000 |
|---|---|---|
| Gas, electric or coal to air-to-water | £7,500 | £4,500 |
| Oil or LPG to air-to-water | £9,000 until 31 March 2027 | £3,000 |
| Any listed fuel to air-to-air | £2,500 | No checked price |
No. The estimator subtracts the published grant from a published air-to-water cost band. Your installer prices the survey, the radiators, the cylinder and the electrical work for that house.
This site only publishes a before-grant range where two checked sources overlap. That range is for air-to-water. Ground source and air-to-air still show the grant, and leave the install price blank.
On this band, yes, while the oil and LPG grant is £9,000. Coal stays on the £7,500 grant, so a coal home uses the same balance as gas on the same install price.
This is a guide, not a decision. Your installer applies and Ofgem decides.
Reviewed by
UK Heat Pump & Funding Specialist
MCIBSE and MCS certified retrofit specialist. Director of Thomson and Sons Low Carbon Consulting Firm Ltd, specialising in heat pump retrofits since 2005.