FLOW WATER HEATER

The flow water heater is used residentially. It includes a heat-exchanger (2) made of two or more heating chambers (13) each being a spirally bent steel tube (14) on the internal side of which a tubular electric heater (15) is fitted. Tube (14) and heater (15) are completely covered by metal having high heat conductivity coefficient. Between every two windings of tube (14) there is one of the windings of the tubular heater (15). Ends (20 & 21) of the steel tubes (14) of the individual heating chambers (13) are interconnected in such a way as to ensure subsequent passing of the water entering the inlet tube (10) across the heating chambers (13) and its discharge through discharge tube (11) Individually chambers (13) have the same or different active lengths and sizes of the steel tubes (14) and the tubular electric heater (15), and making of different combinations of heat-echanging surfaces and electric power is also possible. 1 claim, 3 figures