Patent ID: 7726263

Claim:
A thermosyphonic water heating and storage system, comprising: a heat-insulated main heated water storage tank for storing hot water, said storage tank having top, side and bottom walls; said storage tank having a hot water inlet close to the top wall of the tank for heated water entering the tank, a cold water inlet, and a consumer hot water outlet; an external water heater of a capacity up to several liters and having top and side walls and a base, a controlled electrical heating unit protruding into an interior of said water heater from the top wall thereof, an outlet port for heated water, said outlet port being connectable to the inlet of said tank and a water inlet port; a first valve connected between the a non-consumer outlet of the storage tank and the water inlet port of the external water heater for allowing prevention of water flow from the storage tank to the external water heater during maintenance; a second valve connected between the hot water inlet of the storage tank and the outlet of the external water heater for allowing prevention of hot water flow from the storage tank to the external water heater during maintenance; and said base being detachably affixed on to said side walls for easy maintenance of the external water heater including maintenance and replacement of the electrical heating unit.