HEAT PUMP WATER HEATING SYSTEM

摘要

The present invention aims to provide a heat pump water heating system which can reduce scale deposition in a heat exchanger. A controller 30 of a heat pump water heating system 200 drives a circulation pump 5, a circulation pump 13, and a circulation pump 15, and uses a heat pump unit 1 to increase a temperature of tank water within a hot water storage tank 14 via a plate heat exchanger 11 if the temperature of the tank water detected from a temperature sensor 20 is lower than a heat source switch tank temperature, and the controller 30 stops the circulation pump 5, drives a circulation pump 9, the circulation pump 13, and the circulation pump 15, and uses a boiler 6 to increase the temperature of the tank water within the hot water storage tank 14 via the plate heat exchanger 11 in a shorter time than that of a case in which the heat pump unit 1 is used to increase the temperature if the temperature of the tank water detected from the temperature sensor 20 is equal to or higher than the heat source switch tank temperature.