| 摘要 |
PROBLEM TO BE SOLVED: To suppress a hot water shortage state from being entered while suppressing an increase in total value of power consumption of a water heater.SOLUTION: When there is a hot water amount-deficient water heater (60a) whose remaining amount of hot water is less than a predetermined amount between heat pump water heaters (60a, 60b) which are not in boiling operation, an operation control part (41) performs boiling stop control to stop at least one of heat pump water heaters (60c, 60d, and 60e) in boiling operation from performing the boiling operation, and also performs boiling start control to let the hot water amount-deficient water heater (60a) start performing boiling operation. |
