Planning and grants
Boiler Upgrade Scheme grant and customer contribution (England and Wales, from 21 July 2026)
- where
- customer contribution (£)
- installation cost before grant (£)
- grant value for the technology (£)
Explain this equation
Works out the Boiler Upgrade Scheme grant for a job and what the customer pays. Use it when quoting heat pump or biomass work in England and Wales.
G is the fixed grant for the technology and situation, looked up from the scheme rules rather than calculated: the calculator uses £7,500 for air-to-water and ground source heat pumps (£9,000 where an off-grid home replaces oil or LPG), £2,500 for air-to-air, and £5,000 for biomass in off-grid homes only. The customer pays the cost less the grant, and never less than zero.
A simple subtraction; the eligibility rules do the real work.
Sense check: a £12,000 air-to-water install with a £7,500 grant leaves £4,500 for the customer.
Watch out: the grant is paid to the installer and has conditions, such as capacity limits and a minimum SCOP of 2.8 for air-to-water and ground source. Check the current scheme rules before quoting, as amounts change.
Looks up the Boiler Upgrade Scheme grant for the technology and situation, and shows what the customer pays after it is deducted from the quote.
Enter your values to see the result.
Good to know
Values from 21 July 2026: air-to-water and ground source heat pumps £7,500, or £9,000 in off-gas-grid homes replacing oil or LPG; air-to-air heat pumps £2,500; biomass boilers £5,000 (off-gas-grid only). The installer must be MCS certified and applies for the voucher; the property needs a valid EPC. Check the current Ofgem notice before quoting, because values and eligibility change.
Common mistake
Quoting the £9,000 rate to an off-grid home with electric storage heaters or coal. The higher rate is only for replacing oil or LPG; other off-grid replacements get £7,500.
Limits
England and Wales only (Scotland has Home Energy Scotland grants). Does not check every eligibility rule (EPC, insulation recommendations, previous funding, new-build exclusions).
Sources
Results are calculations from the published methods and figures shown, and depend on the data you enter. Follow MCS standards, manufacturer data, BS 7671, the ENA connection rules and Building Regulations. System design and DNO applications need a competent, certified installer.