Patent ID: 7228695

Claim:
A heat pump type hot water supplying apparatus including a hot water reservoir tank ( 3 ), a circulating path ( 12 ) for connecting a water intake port ( 10 ) formed at the bottom of the hot water reservoir tank ( 3 ) and a hot water inlet ( 11 ) formed at the upper portion of the hot water reservoir tank ( 3 ) to each other, and a water circulating pump ( 13 ) and a heat exchanging path ( 14 ) which are disposed on the circulating path ( 12 ), in which a boiling operation is performed for heating the heat exchanging path ( 14 ) by a heat pump type heating source, boiling water which has not been heated yet from the water intake port ( 10 ) and returning the heated water to the hot water inlet ( 11 ), the heat pump type hot water supplying apparatus characterized in that: a bypassing path ( 17 ) branched from the hot water inlet ( 11 ) and connected to the bottom of the hot water reservoir tank ( 3 ) is disposed on the circulating path ( 12 ); and a freeze-proof operation by circulation is performed such that the water reserved in the hot water reservoir tank ( 3 ) is allowed to flow from the water intake port ( 10 ) to the circulating path ( 12 ) by driving the water circulating pump ( 13 ), so as to be returned to the bottom of the hot water reservoir tank ( 3 ) via the bypassing path ( 17 ) in at least either one case of the case where an outside air temperature is a freeze-proof reference outside air temperature or lower and the case where the temperature of the water through the circulating path ( 12 ) is a freeze-proof reference temperature or lower.