The RHI is the government financial incentive for renewable heat technologies, covering air and ground-source heat pumps, biomass boilers and solar thermal panels. Administrated by Ofgem, the scheme was set up to encourage the take-up of renewable heating installations to reduce carbon emissions and contribute to the UK’s renewable energy targets.

For domestic installations, the RHI is payable quarterly for seven years, and is subject to digression. This means that the tariff rates will decrease over time based on the amount of installations commissioned and registered on the RHI, to monitor the amount of funding allocated. Ofgem release new tariff tables at least once per year. Once you’ve applied and been accepted however, your rates are set at whatever they were at the time of your acceptance.

Domestic RHI tariff

As of July 2019, the domestic RHI tariffs are:

  • Biomass boilers: 6.88p/kWh
  • Air source heat pumps: 10.71p/kWh
  • Ground source heat pumps: 20.89p/kWh
  • Solar thermal panels: 21.09p/kWh

The way the RHI is calculated for your heat pumps and biomass is based on your Energy Performance Certificate (N.B. Some installations require the system to be metered if the installation is not supplying 100% of the heat demand). The EPC will give an annual heat demand in kWh for your property (i.e. how much energy your home requires) for both heating and hot water. Heat pump systems are also subject to the Seasonal Coefficient of Performance (SCOP), which takes into account the amount of electricity consumed by the heat pump and the amount of free renewable energy it has produced.

The RHI payments made on heat pumps and biomass will be limited to the renewable proportion of heat demand. If the figure on your Energy Performance Certificate is higher than this amount, you can still apply, but the contributions will be capped at these limits:

Capped annual energy demands (kWh)

  • Ground-source heat pumps: 30,000kWh
  • Air-source heat pumps: 20,000kWh
  • Biomass: 25,000kWh

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