Funding for Solar Thermal Systems

Solar Thermal is eligible for the Renewable Heat Incentive (RHI).

What is the Renewable Heat Incentive?

The RHI is very similar to the FIT (Feed in Tariff) scheme for renewable electricity; however the RHI only applies to technologies that generate renewable heating.

The purpose of the RHI is to encourage take-up of renewable heat technologies that are typically more expensive to install and run than traditional fossil-fuel heating systems.

The Government implemented the RHI cash incentive scheme means you will be paid quarterly on the total amount of renewable heat generated, which is expressed in kilo watt hours (kwh).


Definition of Commercial / Domestic sectors

“…where a renewable heating installation serves a single private residential dwelling only. This does not include multiple residential dwellings served by one renewable heating installation (e.g. district heating) nor residential dwellings which have been significantly adapted for non-residential use. For example, a house where someone works or runs a business from home would be considered domestic whereas a house converted to be a shop or bed & breakfast would be considered non-domestic. This means that if a company, private landlord or registered social landlord installs single renewable heating units, in one or multiple residential dwellings, this would constitute a domestic installation.”

Included Technologies

Only technologies that fall under the Microgeneration Certification Scheme (MCS) accredited, and installed by MCS accredited installers, will be eligible for the RHI payment.

  1. Ground Source Heat Pumps.
  2. Solar Thermal
  3. Biomass Boilers
  4. Air Source Heat Pumps are not included for commercial but are included for domestic.
  5. Biogas.
  6. Biomethane
  7. Bioliquids
  8. Combined Heat and Power (CHP

Wood burning stoves, air convection heaters and open fires are not included under the RHI scheme.

The MCS accreditation scheme was implemented to ensure that purchasers of energy systems are covered under OFGEM’s Code of Conduct and Consumer Protection policies.

Tariff Rates

Non Domestic Renewable Heat Incentive (ndRHI)

You receive a guaranteed 20 year, index linked payment.


Domestic RHI (dRHI)

You receive a guaranteed 7 year, index linked payment.

The annual dRHI payment is derived by an independent Domestic Energy Advisor (DEA) undertaking a Green Deal Assesment.

The assessment determines the kW hours a household will use in a year for hot water. The kW Hours figure produced is simply multiplied by the dRHI rate and that is the amount paid per annum.

Please see the Energy Savings Trust website for current information about tariff rates:

Energy Saving Trust