Patent ID: 8333169

Claim:
A water heater especially for bathroom, is characterized in that, it includes a hair filter ( 1 ), a water self pumping pump ( 2 ), a heat exchanger ( 3 ), a heater ( 4 ), a tap water inlet valve ( 5 ), a controller ( 6 ), an operator ( 7 ), three water flow resistance amplifiers ( 8 ), a waste water tank ( 9 ) and pipes used for connections, the hair filter ( 1 ) is installed at the water outlet of a base of a bathroom; the water self pumping pump ( 2 ), the heat exchanger ( 3 ), the heater ( 4 ) and the controller ( 6 ) are installed together or separately in an empty cavity located at the lower part of a base (end tube) of the bathroom, or at a position for installing which is on the side wall or on the upper part of the base behind the back wall of the bathroom; the operator ( 7 ) is arranged on a position on the inside wall or on a back wall which is convenient to operate; the waste water tank ( 9 ) is installed at the outside top of the bathroom or on the wall above a toilet in a washroom of users and can provide tile toilet with water automatically by taking advantage of the height difference, the water self pumping pump ( 2 ) has a water inlet pipe-jointed with the hair filter ( 1 ) and a water outlet pipe-jointed with the waste water inlet ( 11 ) of the heat exchanger ( 3 ); the waste water outlet ( 13 ) of the heat exchanger ( 3 ) pipe-joints with the waste water inlet ( 10 ) of the waste water tank ( 9 ); the waste water outlet ( 15 ) of the waste water tank ( 9 ) pipe-joints with the water inlet of the toilet of users, and the overflow port ( 16 ) of the waste water tank pipe-joints with the waste water tank or water pipeline; the tap water inlet ( 12 ) of the heat exchanger ( 3 ) pipe-joints with the water outlet port of the tap water inlet valve of the bathroom, the water inlet port of the tap water inlet valve of the bathroom pipe-joints with a tap water pipeline of users after serially pipe-jointing with a water flow resistance amplifier ( 8 ), the tap water outlet ( 14 ) of the heat exchanger pipe-joints with the water inlet of the heater ( 4 ) after serially pipe-jointing with another water flow resistance amplifier ( 8 ); the water outlet of the heater ( 4 ) pipe-joints with a shower head ( 18 ) in the bathroom after serially pipe-jointing with a water flow resistance amplifier ( 8 ); the tap water inlet valve ( 5 ) is serially pipe-jointed on the proper position of the tap water pipeline of the water heater through a tube, the controller ( 6 ) has a input port electrically connected to the power of users and a output port electrically connected to the water self pumping pump ( 2 ), the heater ( 4 ), the tap water inlet valve ( 5 ) and the operator ( 7 ).