Double walled construction with inner and outer chamber made of S.S. the gap in between being filled with glass wool. The condenser and top are also made of S.S. the raw water is first made of pass around the tubes in the condenser where it gets heated nearly to the boiling point thus economizing the heating energy. The heated water passes to the evaporator through a water level maintaining pipe. Excess water is let out through the drain. To work on 220/230 volts A.C. supply