Supplying water to a reticulation system from different sources

摘要

A water supply system for supplying water to a building including a water tank ( 13 ) for collecting water from the roof ( 10 ) and gutters ( 12 ) of the building ( 11 ); a water level sensor means ( 21 ) for sensing the level of water in the water tank; a tank water system ( 22 ) for supplying water from the water tank ( 13 ); a water pump ( 23 ) for pumping water from the water tank ( 13 ) along the tank water system ( 22 ); a non-return valve ( 25 ) downstream of the pump in the tank water system; a pressure sensor means ( 26 ) for sensing water pressure of water within the tank water system, said pressure sensor means ( 26 ) is located downstream of the non-return valve ( 25 ); a mains water system for supplying mains water; a three port valve ( 35 ) having a first port ( 34 ) connected to the tank water system downstream from the pressure sensor means ( 26 ), a second port ( 37 ) connected to the mains water system and a third port ( 41 ) connected to the building's water reticulation system; wherein when the first ( 34 ) and third port ( 41 ) are open the second port ( 37 ) is closed and when the second ( 37 ) and third port ( 41 ) are open the first port ( 34 ) is closed; and a control means ( 27 ) for operatively receiving inputs from the water level sensor means ( 21 ), pressure sensor means ( 26 ) and mains electricity supply ( 45 ) and controlling the water pump ( 23 ) and the three port valve ( 35 ).