| 摘要 |
PROBLEM TO BE SOLVED: To provide a water heater that can reduce a risk of freezing of hot water within a boiling-up heat exchanger.SOLUTION: A water heater includes: a boiling-up mixing valve 50 having first and second water inflow ports 50a, 50b and a water outflow port 50c; a boiling-up pump P1; temperature sensors T11, T12, T13; and a control device. When temperatures detected by the temperature sensors T11, T12, T13 reach a preset freezing prevention temperature or lower, the control device activates the boiling-up circulation pump P1 with the first water inflow port 50a opened and the second water inflow port 50b closed. |
