| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot water storage type water heater capable of securing stability of a hot water supply temperature and suppressing deterioration in boiling-up efficiency.SOLUTION: A hot water storage type water heater comprises: a heat exchanger 52 for hot water supply which exchanges heat between hot water in a hot water storage tank 8 and fed hot water; a hot water supply source conduit 46 for guiding from the upper part of the hot water storage tank 8 to the lower part of the hot water storage tank 8 via the heat exchanger 52 for hot water supply; a water feed conduit 9 which guides fed hot water to a hot water supply terminal via the heat exchanger 52 for hot water supply; a hot water supply source pump 48 which circulates the hot water in the hot water supply source conduit 46; and a control unit 36. The control unit 36 controls the output of the hot water supply source pump 48 so that a heat source-side flow rate Fl is equal to or larger than a water feed-side flow rate Fk when the water feed-side flow rate Fk is equal to or larger than a flow rate threshold, and also controls the output of the hot water supply source pump 48 so that the heat source-side flow rate Fl is less than the water feed-side flow rate Fk when the water feed-side flow rate Fk is smaller than the flow rate threshold. |
