5. It will be considered technically feasible to install meters in a building not consisting mainly of private dwellings unless—
(a)the heat distributed in the building from the district heat network or communal heating is by means of a system other than hot water;
(b)there is more than one entry point for the pipes of the district heat network heating or communal heating into each private dwelling or non-domestic premises in a building or the entry point of the pipes is unknown; or
(c)the district heat network or communal heating supplies cooling and the cooling distribution system uses a transfer fluid other than water.