Your property must be a home or small non-domestic building in England or Wales. The maximum installation capacity of 45 kWth covers the vast majority of these properties. The overall system capacity for any shared ground loop system must not exceed 300 kWth. 

Your property must have a valid energy performance certificate.

Where a low carbon heating system has been commissioned prior to an installer submitting a voucher application, installers must ensure that the voucher application has been or will be, properly made within 120 days of the commissioning date stated on the MCS certificate.

Biomass boilers are only eligible in properties that are both in a rural location and not connected to the gas grid. Heat pumps do not have either of these restrictions.

You must be fully replacing an existing fossil fuel system such as an oil or gas boiler, or an electric heating system such as storage or panel heaters. Funding will not be available for the replacement of existing low carbon heat systems.

The installation cannot be funded by more than one source of public funds and you cannot apply if you have already been given government funding or support for a heat pump or biomass boiler.

You can still apply if you’ve received separate funding for energy efficiency upgrades such as insulation, doors or windows.

New-build homes and social housing are not eligible for the Boiler Upgrade Scheme, although self-build properties are eligible.