FAQs
What if you make changes to a registered installation?
These will have to be notified to Ofgem. You may even lose your tariffs.
Chapter 2 of the government's RHI announcement says
Changes to installations
Where changes are made to an accredited installation, for example, where a participant adds additional heating equipment, the participant will need to inform and provide information to Ofgem, who will then decide whether the installation still meets the eligibility criteria.