3. A plant which is a biomass plant, heat pump or solar thermal plant is eligible for accreditation where it meets the requirements (“the eligibility criteria”) set out in—
(a)regulation 4, 5, or 6 (whichever is applicable to the plant);
(c)if the plant is not the first and only plant to provide heat to a property, regulation 12; and
(d)if regulation 13 requires that the heat generated by the plant must be metered, regulation 14.