DESNZ confirms reforms to Boiler Upgrade Scheme and certification framework
The Department for Energy Security and Net Zero (DESNZ) has published government responses to its April 2025 consultation on the Boiler Upgrade Scheme (BUS) and certification requirements for clean heat schemes. The measures, finalised in November 2025, expand BUS eligibility to include air-to-air heat pumps and heat batteries (each supported by £2,500 grants), relax the Energy Performance Certificate requirement from 2026/27, and mandate that installers deduct grants upfront. The department has also confirmed that the Microgeneration Certification Scheme (MCS) will become the sole certification body for clean heat measures under BUS, ECO4, and Warm Homes schemes, with a memorandum of understanding between DESNZ and MCS to ensure oversight.