24.—(1) Subject to paragraph (2), regulation 23 applies in respect of each ground source heat pump which forms part of a shared ground loop system.
(2) But where a ground source heat pump which forms part of a shared ground loop system is installed in domestic premises, regulation 23 only applies if one or more of the following conditions is met—
(a)the ground source heat pump provides heat to the same property as another plant (“plant B”), unless plant B—
(i)is a solar thermal plant;
(ii)is designed and installed to heat only one room;
(iii)captures heat from air which is expelled from the property and transfers that heat into fresh air entering that property without generating additional heat;
(iv)is an immersion heater for a domestic hot water cylinder or is any other plant which solely generates heat for the purpose of heating domestic hot water; or
(v)is a supplementary electric heater which is controlled by the same control system as the control system governing the ground source heat pump;
(b)the property to which the ground source heat pump provides heat was occupied for less than 183 days in the 12 month period ending with the tariff start date for the shared ground loop system and is not a new-build property; or
(c)the ground source heat pump is capable of using a fuel when generating heat for an eligible purpose.
(3) Where a ground source heat pump which forms part of a shared ground loop system is installed in domestic premises and one or more of the conditions in paragraph (2) is met, a certified installer must have been responsible for the installation of any heat meter required by these Regulations.