| 摘要 |
PROBLEM TO BE SOLVED: To control cold water sandwich phenomenon generated in starting a hot water supply operation of an operation-scheduled water heater scheduled to perform hot water supply operation next by increase of hot water supply load among the water heaters stopping their hot water supply operation, in a connection type water heater provided with the plurality of water heaters connected in parallel between a common water supply passage and a common hot water supply passage, and increasing and decreasing the number of water heaters performing the hot water supply operation according to hot water supply load. SOLUTION: When the operation-scheduled water heater receives a preheating operation command output when the hot water supply load is increased to some extent (S102), a preheating operation is performed to heat remaining water of a heat exchanger of the water heater to a set temperature (S104). When a detected temperature T of a remaining water temperature detecting means is lower than a determination temperature YT set according to the set temperature (S109), though a hot water supply operation command is received (S101), the start of hot water supply operation is delayed until T≥YT is achieved by the preheating operation. COPYRIGHT: (C)2007,JPO&INPIT
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