Regulation 21 Installations generating heat using heat pumps
This regulation applies if the plant is a heat pump and complies with the following requirements—
(a)
it generates heat using naturally occurring energy stored in the form of heat from one of the following sources of energy—
(i)
the ground (other than naturally occurring energy located and extracted from at least 500 metres below the surface of solid earth),
(ii)
surface liquid or ground liquid, and
(b)
it has a coefficient of performance of at least 2.9.