Boiler Upgrade Scheme (BUS)

Start date of installation of your new heat pump or biomass boiler: this must be no later than the eventual closing date of the scheme, currently 31 December 2027.

Energy Performance Certificate (EPC) status: you must be in possession of a valid EPC issued within the past two years in respect of the property on which the work will be carried out. Furthermore, you must have implemented any outstanding recommendations on the EPC document for completing the insulation of your property to the required standard. This may include loft insulation to the recommended 270mm thickness, and / or cavity wall insulation. There may be exceptional circumstances such as a recognised risk of damp ingress in older properties of particular types of construction and in particularly wet locations that allow for an exemption from the normal requirement for cavity wall insulation.

Classification of property: the property in respect of which you apply to the scheme must normally be either a home you already own and live in (known as an ‘owner-occupier’ home), or one of which you are the private landlord. Second homes are eligible, and some small commercial (‘non-domestic’) properties may also be eligible. Property owned by local councils and rented out as social housing is ineligible. New-build properties under construction by property development companies are also ineligible, whether or not they have already found buyers. Self-build properties whose construction is being overseen or carried out by a private owner intending to inhabit them without a property development company having owned them first may however be eligible for the scheme provided that the application is in respect of heat pump installations, and not biomass boilers.

Total heat energy requirement of property: the property must have an estimated total heat energy supply requirement of no more than 45 kWth (Kilowatts-thermal). This covers nearly all domestic properties but may exclude some exceptionally large mansions and converted former schools and churches.

Effectiveness of new installation at meeting total heat energy requirement of property: the heat pump or biomass boiler system being installed must be capable of fully meeting both the space heating requirements and the hot water requirements of the property in which it is being installed. This means that it is not permitted to install a cheaper heat pump system that only meets a fraction of the total energy needs of the property and then claim back its cost under the Boiler Upgrade Scheme.

Technical efficiency of new installation: the heat pump or biomass boiler system being installed must meet or exceed regulated efficiency standards for products of its class; in the case of biomass boilers, they must also meet standards for maximum levels of polluting emissions. Most new commercial products should meet the standards currently in force for efficiency and emissions, but if in doubt, please check with your supplier or installer that the products they are proposing to sell you or install at your property meet them.

Technology of the previous heating system at the property: the previous heating system at the property must be fossil fuel-based or based on mains electricity. It is not permitted to apply to the Boiler Upgrade Scheme to replace an existing low-carbon heating system (e.g. solar thermal panels) with a new one, even if the new one is better and more comprehensive in its meeting of your domestic heating needs.

You can read more on the UK government website here.