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4. Where the agreement relates to an accredited domestic plant which is a heat pump (“the plant”), the applicable requirements referred to in paragraph 1(b) are that the agreement requires that—
(a)eligible heat meters are installed to record the heat generated by the plant or its components;
(b)eligible heat meters are installed to record the heat generated by any other plant which is connected to the same heat distribution system as the plant or, if it is not feasible to install eligible heat meters for this purpose, any other type of eligible meters which can be used to determine heat generated by the other plant are installed;
(c)temperature sensors are installed which enable the recording of—
(i)the temperature of the liquid leaving the plant to provide space heating; and
(ii)if the heat pump generates heat for the purpose of heating domestic hot water, the temperature of the liquid leaving the plant for the sole purpose of heating domestic hot water or entering the domestic hot water cylinder;
(d)eligible electricity meters are installed to record—
(i)any electricity supplied to any components of the plant included in the heat recorded under sub-paragraph (a);
(ii)if the plant is used for the purpose of heating domestic hot water, the total electricity supplied to the domestic hot water system including the electrical consumption by any immersion element in a domestic hot water cylinder;
(e)temperature sensors are installed to measure the indoor temperature in at least one room in the RHI property to which the plant provides heat;
(f)if the plant is a ground source heat pump, temperature sensors are installed to record the temperature of the liquid in the part of the plant that extracts heat from the ground or water as it enters, and returns from, the ground or water; and
(g)if the plant is an air source heat pump, temperature sensors are installed to measure the external air temperature.
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