HEAT PUMP TYPE HOT WATER SUPPLY DEVICE

PURPOSE:To lower the temperature of water in a hot water storage tank and hence minimize heat loss by installing a capacity controllable compressor, a circuit which lowers the temperature of the water in said hot water storage tank, and providing a heating coil and a heating condenser in a hot water supply pipeline at the outlet of the hot water storage tank. CONSTITUTION:When hot water supply is not used, for example when the temperature of storage water does not exceed 40 deg.C, a circulation pump 8 and a compressor 20 are adopted to operate. When hot water supply is necessary, a hot water supply valve 4 is opened. At that time, the pressure in a hot water supply pipeline 12 drops; a pressure switch 19' is actuated so that a solenoid valve 22 is opened while a solenoid valve 21 is closed simultaneously. On the other hand, the drive of the compressor 20 compresses the refrigerant gas so that it is turned into a high temperature and high pressure gas. The gas flows into a heating condenser 18, passing through a refrigerating pipeline 5 by way of the solenoid valve 22. In the condenser, it exchanges heat with a heating coil 16, and heats the supplied hot water by radiating the heat. In this junction, the rotary speed is controlled by a frequency control of the compressor 2 until it reaches a preset temperature of a thermostat for hot water supply service.