The Boiler Upgrade Scheme (BUS) supports the decarbonisation of heat in buildings. It provides upfront capital grants to support the installation of heat pumps and biomass boilers in homes and non-domestic buildings in England and Wales. Grants of £5,000 are available for air source heat pumps (ASHPs) and biomass boilers, and grants of £6,000 are available for ground source heat pumps (GSHPs). Grants are offered at a flat rate and do not vary by capacity of the installation, which must not exceed 45 kWth. The scheme opened for applications on 23 May 2022.
From Monday 23 October 2023, installers will be able to apply for the newly increased grant amounts, the grants available are based on technology types as shown below:
air source heat pumps: £7,500
ground source heat pumps: £7,500
biomass boilers: £5,000
Voucher applications made for heat pumps which are submitted on or after Monday 23 October 2023 will receive the increased grant amount, subject to meeting BUS eligibility criteria and successfully redeeming the voucher within the validity period.
This guidance outlines Ofgem’s administration of the BUS. It is for property owners wishing to install a BUS funded heat pump or biomass boiler. This document was first published on 6 May 2022 as draft guidance for comment. We published an updated version on 21 July 2022 following feedback.
The latest version of the guidance was published on 07 December 2023.
We have also published guidance for installers. Information on the BUS is also available on the GOV.UK website.