| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot water heating system which enables the user to easily check and recognize that the air bleed operation performed automatically is not abnormal. SOLUTION: A hot water heating system is equipped with a heat source unit 2 having a circulation pump 22, and heating loads 7 and 8 for performing the heating by circulating and supplying the hot water of this heat source unit 2. The heat source unit 2 possesses a function of performing air bleed operation by driving the circulation pump 2. Then, this is equipped with an air bleed operation display means 58 which indicates to the effect that it is in air bleed operation, during the air bleed operation.
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