The Boiler Upgrade Scheme (BUS) is a government initiative that provides grants to support the installation of more energy-efficient heating systems in homes and small non-domestic buildings. It is a new program that replaced the Domestic Renewable Heating Incentive (DRHI), which ended in March 2022.

Under the BUS, consumers can receive a one-time grant towards the installation of specific heating technologies. Currently, you can receive £7,500 towards the installation of an air source heat pump (ASHP), ground source heat pump (GSHP) or biomass boiler.

To apply for the BUS, Carbon Legacy will initiate the voucher application on your behalf. It’s important to note that the installer needs to apply for the voucher on the customer’s behalf.

The scheme is open to homes and small non-domestic buildings, both on and off the gas grid, including owner-occupiers, private landlords, and self-builders. However, new buildings for sale and social housing are not eligible. To qualify, consumers need to have an Energy Performance Certificate (EPC) issued in the last 10 years.


  • Who Can Apply: Homeowners and owners of small business properties in England and Wales.
  • Requirements: You must own the property (home or small business property), have a valid Energy Performance Certificate (EPC) without outstanding recommendations for loft or cavity wall insulation (unless exempt), and the installation capacity must not exceed 45kWth, which covers most homes.

Funding Available

  • Air Source Heat Pump (ASHP): £7,500 towards the cost and installation.
  • Ground Source Heat Pump (GSHP): £7,500 towards the cost and installation.
  • Biomass Boiler: £5,000 off the cost and installation.

Application Process

  • Carbon Legacy will assess your property and carry out the work.
  • We will confirm your eligibility and include the grant in our quote.
  • We will apply for the grant on your behalf and then proceed with the installation.

Key Points

  • Grants offered do not vary by the capacity of the installation but are subject to the type of system installed.
  • For applications made before 23 October 2023 for heat pumps, the previous grant amount applies. However, you can discuss with your installer about reapplying under the new grant amounts if the installation hasn’t been completed yet.
  • The scheme aims to make the transition to low-carbon heating more affordable and is part of the UK’s effort to reduce carbon emissions and combat climate change.

For more detailed information, including how to apply:

Speak to us

Need help with the BUS

If you require more information, or need some advice on applying for the BUS grant, then pop in or give us a call. Our GEA’s are always available to answer any questions you may have and give free no obligation advice.