| 摘要 |
PURPOSE:To provide a water heater which prevents a fluctuation in temperature of a supplied hot water through control of an amount of fuel supplied in accordance with a change in a water quantity, and has an excellent temperature characteristic. CONSTITUTION:With a hot water feed faucet 4 opened, a water flow stream is caused in a water feed path 2, a detecting temperature of a heat sensitive element 9 falls as a result of absorption of heat by passage of water, and a detecting output starts to decrease. Through detection of said reduction in the detecting output, a gas proportioning valve 7 is opened to fire a gas burner 5. After the gas burner 5 is fired, the detecting output of the heat-sensitive element 9 and a detecting output of a heat-sensitive element 10 are inputted to a comparator 11 by which they are compared and computed. Such comparing output is amplified by an amplifier 8 to input it to the gas proportioning valve 7, and the combustion amount of the gas burner 5 is controlled in proportion to a water quantity to maintain temperature of feed hot water in a specified temperature to set. |
