| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that the specification of a hot-water supplier is different in a case when one set of the supplier is used alone or when a multitude of the suppliers are used while being connected in parallel whereby the hot-water supplier is manufactured differently so as to cope with the usage of the same and, as a result, the manufacturing cost of the same becomes expensive. SOLUTION: When a connecting unit 8 is connected to the hot-water supplier 1 capable of being operated by one set individually, the control unit of the hot-water supplier 1 detects the connection of the unit 8 and switches the operation mode of the hot-water suppliers from the individual operation mode into the connecting operation mode automatically.
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