Header Tank System

A header tank can be incorporated into a pumped rain harvesting system.
A variation on a conventional pumped system includes a header tank fitted with dual inlet valves. Rainwater normally fills the tank as long as it is available. When there is no supply from the pump the mains water inlet valve opens. This arrangement can be used to overcome the potential loss of supply to WCs during times of power failure. The washing machine and garden tap are fed directly from the pump as the header tank will give insufficient pressure for these purposes.