Home Sources
Where every figure comes from.
We take every amount, date and rule on this site from the body that publishes it: Ofgem, gov.uk, legislation.gov.uk, government statistics or the Welsh Government. Each one is listed below with a link.
How we keep it right
- Every figure on the site is read from the source linked here. None is typed into a page by hand.
- We re-read the sources when Ofgem publishes new guidance or the government publishes new statistics, and show the date we last checked on every page.
- Heat Pump Grant Check is independent. It is not a government service and is not connected to Ofgem or gov.uk.
Sources
We checked every figure on this page against these sources on 26 October 2026.
- Where the grant applies — Ofgem: Boiler Upgrade Scheme.
- Grant amounts — Ofgem: Boiler Upgrade Scheme for property owners.
- Off-gas-grid uplift — Ofgem: Boiler Upgrade Scheme for property owners.
- Eligibility — Ofgem: Boiler Upgrade Scheme for installers.
- Passing on the grant — Ofgem: Boiler Upgrade Scheme installer guidance v5.1, para 2.04.
- VAT on installation — Ofgem: Boiler Upgrade Scheme for property owners.
- Scheme end, by law — The Boiler Upgrade Scheme Regulations 2022, regulation 15, reg. 15(7)(c) and reg. 15(2)(b)(ii).
- Voucher validity — Ofgem: Boiler Upgrade Scheme installer guidance v5.1, para 1.06.
- Typical installed cost before grant (air source) — DESNZ: Boiler Upgrade Scheme statistics, August 2026, table Q1.1A and Energy Saving Trust: air source heat pumps.
- Ground source typical cost (financial year 2025/26) — DESNZ: Boiler Upgrade Scheme statistics, August 2026, table A1.3A.
- Wales: same rules, different alternatives — Welsh Government: Warm Homes Nest eligibility, Welsh Government: planning permission for heat pumps and Welsh Government: First 100 Days — warmer, more energy efficient homes, section 3.5.
- Scotland and Northern Ireland — Ofgem: Boiler Upgrade Scheme installer guidance v5.1, para 3.28 and Home Energy Scotland: grants and loans.