Renewable Heat Incentive (RHI)

The Renewable Heat Incentive (RHI) for solar thermal systems Phase I of the RHI has been up and running for a while now and the long awaited Phase II for domestic systems is now in place. - see our comment below!

Phase I of the RHI is for commercial systems and Phase II is for domestic installations.

The principal difference between the two is the way the payment due is assessed, in a commercial system the installation of a certified heat meter is required but for domestic systems it is based on the calculated SAP performance provided at the time of installation.

Any solar thermal system installed by an MCS registered installer after 15th July 2009 with equipment meeting the acceptable criteria at the time, is eligible to claim the RHI once the system is registered with Gemserv. 


Phase I - Commercial

The payment period is 20 years and based on measured performance using a certified heat meter. Further information about claiming this payment can be found on the OFGEM website.

Phase II - Domestic

The payment you receive will be spread over seven years but any grant or Renewable Heat Premium Payment already received will be deducted from it.

The payment is based on the forecast heat production of the system from the SAP calculation done at the time, this will be at 19.2p/kWhr This means a system estimated to provide 1200kWhr/a will earn £1612 over the seven year period.

In order to be eligible for the RHI you will require a Green Deal survey which will cost around £150. The survey will provide you with a report on the energy efficiency of your property. You will also need an Energy Performance Certificate (EPC). Cost of this survey is likely to be around £50, this link will take you to a list of assessors.