‘Simple’ and ‘Complex’ Installations

The Renewable Heat Incentive (RHI) regulations classify systems as either 'simple' or 'complex' for RHI metering purposes. This determines the number of heat meters that will be required and their positions.

For simple systems the heat generating plant must be in the same building as the heat usage with all heat going to 'eligible loads'. In principle, for a simple system, only the output of the renewable heat generating plant needs to be measured and this can usually be achieved with a single heat meter.

RHI flow diagram - Source: Ofgem, RHI Guidance
RHI flow diagram - Source: Ofgem, RHI Guidance

For complex systems the output from both renewable heat sources and fossil fuelled plant will be need to be metered separately. Further meters will also be required to differentiate between eligible and 'ineligible loads'.

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