Indirect Systems ~ Cold water is supplied to all outlets from a cold
water storage cistern except for the cold water supply to the
sink(s) where the drinking water tap is connected directly to
incoming supply from the main. This system requires more pipework
than the direct system but it reduces the risk of back syphonage
and provides a reserve of water should the mains supply fail or be
cut off. The local water authority will stipulate the system to be
used in their area.Cold Water Installations