| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a water heater capable of suppressing the occurrence of a high-temperature tapping malfunction and a low-temperature tapping malfunction even if an inflow water temperature is significantly lowered. <P>SOLUTION: The water heater 1 includes a heat exchanging part 11, an inflow water temperature sensor 27, and a hot water side flow rate sensor 28. The water heater includes a function in which a combustion amount is calculated based on the present inflow water temperature and a flow rate of passing water, with a set hot water delivery temperature as the target, and hot water controlled in combustion by the combustion amount and flowing through the heat exchanging part 11 is heated. When there is a hot water delivery request during combustion or at the start of combustion, and when the lowering of the inflow water temperature by a temperature width of a prescribed value or larger is recognized within a range of a constant time until a prescribed condition is satisfied, combustion control is executed with a specific value as the inflow water temperature in place of the present inflow water temperature. Failures such as the high temperature tapping malfunction and the low temperature tapping malfunction are suppressed. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
