VERTICAL ELECTRIC WATER HEATER WITH EXTERNAL HEAT EXCHANGER AND REHEATING METHOD USING EXTENSIBLE PIPE

PROBLEM TO BE SOLVED: To minimize degradation of hot water/water in a hot water storage tank, to supply hot water for a long time, and to minimize energy in the next boiling-up by returning the warm water which is utilized in heat exchanging treatment in a heat exchanger and of which a temperature is lowered, to a warm water layer zone of the same temperature in the vertical hot water storage tank. SOLUTION: This vertical electric water heater includes the hot water storage tank 2 vertically long, a pipe 8 branched from a hot water supply pipe 7 connected to a hot water supply port 4 of the hot water storage tank 2, the heat exchanger 6 connected to a recovery port 9 formed at a lower section of the hot water storage tank 2, and circulating the warm water in the hot water storage tank 2 by a pump 10 to reheat the warm water of the external such as a bathtub 61, and the extensible pipe 11 connected to the recovery port 9 formed at the lower section of the hot water storage tank 2, vertically elongated and contracted in the hot water storage tank 2, and including a discharge port 12. COPYRIGHT: (C)2011,JPO&INPIT