Patent ID: 8672233

Claim:
A water saving device for a hot water discharging means, said device comprising: a housing having a hot water inlet chamber having a hot water inlet connectable to a hot water supply, a temperature sensing chamber having a cold water outlet connectable to a water storage system, and a hot water outlet chamber having a hot water outlet connectable to said hot water discharging means; said hot water inlet chamber and said hot water outlet chamber being interconnected by a first port, said hot water inlet chamber and said temperature sensing chamber being interconnected by a second port, and said temperature sensing chamber and said hot water outlet chamber being interconnected by a third port; a water-pressure actuated piston being slideably mounted within the hot water inlet chamber to define two separate sub-chambers, the first sub-chamber being in fluid communication with the hot water inlet and the second sub-chamber being in fluid communication with the hot water outlet chamber via said first port, said piston being displaceable upon a predetermined drop in water pressure in the hot water outlet chamber, caused when the hot water discharging means is opened, from a first position, in which the second port is closed by the piston, to a second position, in which the second port is open; and said temperature sensing chamber having a temperature-sensitive valve assembly that closes the third port when the temperature of water flowing through the housing is below a predetermined level and being arranged to open the third port and close the cold water outlet when the temperature of water flowing through the chamber is above a predetermined temperature.