The standards specified for that development are that the development must--
(a) not be a solar hot water system, and
(a1) if it uses a heat pump water heater, be designed so as not to operate--(i) during peak time--at a noise level that is more than 5 dB(A) above the ambient background noise level measured at any property boundary, or(ii) during off peak time--at a noise level that is audible in habitable rooms of adjoining residences, and
(b) if constructed or installed externally and on or in a heritage item or a draft heritage item or in a heritage conservation area or a draft heritage conservation area--(i) not be located on a roof, and(ii) be located in the rear yard.