scope:

Specifies requirements for 3 types of open (vented) combination hot water storage units having hot water storage capacities in a series of ranges between 65 l and 210 l inclusive, in which, when water is drawn off from the hot water storage vessel, there is automatically: a) replacement of water withdrawn by that from a cold water feed cistern incorperated in the unit and adjacent to the hot water vessel; and b) controlled replacement of the water in the cold water feed cistern from the water supply by means of a float operated valve. Electric immersion heaters are outside the scope of this standard.