Patent ID: 6674055
Filing Date: 2004-01-06
Classification: C02F,H05B

Abstract:
An electromagnetic water heater comprising:an outer cover, a water tank within the cover for receiving and storing a quantity of heated water, a heating element having an inlet and an outlet connected with the water tank, a first valve for allowing a flow of cold water to the inlet of the heating element, a water pump having an inlet connected with the water tank and an outlet, a second valve connected to the water pump outlet for allowing a flow of water from the water tank to the heating element inlet, and a controller for selectively opening the first or second valves to provide and maintain a quantity of heated water in the water tank, wherein the heating element further comprises: an electric coil, an outer tube disposed within the coil, a metal core rod disposed within the outer tube, two end bulkheads, one at each end of the outer tube, and a water inlet in one end bulkhead and a water outlet on the other end bulkhead, wherein the metal core rod has a screw-shaped through-flute in its surface and two holes separately on its two ends to connect the screw-shaped through-flute with the water inlet and the water outlet, the screw-shaped through-flute creating a helical passage between the metal core rod and the outer tube between the water inlet and water outlet.