Resource hub Funding Watch Renewable Heat Incentive (RHI) Eligible technologies include solar collectors, ground-, water- and air-source heat pumps, combined heat and power (CHP), and solid biomass installations such as wood chip boilers. Once an installation is approved, RHI tariffs are paid. The tariff rate depends on the type of installation and installation date and are generally updated quarterly. Public and private sector organisations. Amount: Variable. Find out more.