Water heater

本热水器可以防止运行中加热源以最大加热量工作但出水温度仍达不到设定的温度，使用者误认为是热水器故障的问题。根据进水温度运算器20计算出并检测进水温度、通水管4所确定的最大通水量及煤气燃器3所确定的最大加热量，通过最高出水温度计算器23求出在最大通水量时在当时进水温度下出水的可能最高温度。当设定温度比所求出的该最高出水温度高时，报警发令器24发出指示，使报警蜂鸣器15报警。 PURPOSE: A hot water supply device is provided to prevent a driving of the hot water supply device when a temperature of hot water supply is not reach a set temperature and a miss understanding as a defect of the hot water supply device. CONSTITUTION: A hot water supply device contains a water temperature detector(20) to detect a temperature of supplied water in the hot water supply device; a maximum water supply temperature calculator(23) to calculate a maximum temperature from the detected water temperature, a predetermined maximum contained amount of the hot water supply device and maximum heating amount; and an alarming device(25) to transmit an alarm when the set temperature is higher than the calculated maximum temperature. Thereby, a miss understanding as a defect of the hot water supply is prevented.