| 摘要 |
PROBLEM TO BE SOLVED: To provide a water heating device capable of boiling hot water in a hot water storage tank efficiently with simple constitution.SOLUTION: A water heating device includes: a mixing valve 50 which mixes outflow hot water from an upper part of a hot water storage tank 3 with water from a lower part of the hot water storage tank 3; boiling circuits (L1, L2, 10, L3) connected to the upper part of the hot water storage tank 3 through the mixing valve 50 and a boiling heat exchanger 10 from the lower part of the hot water storage tank 3; a circulation pump P1 for boiling arranged at the boiling circuits (L1, L2, 10, and L3); a heat pump unit 2 which boils water from a tap side of the mixing valve 50 by the boiling heat exchanger 10; and a control device 100 which controls the mixing valve 50, circulation pump P1 for boiling, and heat pump unit 2. |
