| 摘要 |
PURPOSE: A boiler without a supplementary water tank is provided to reduce manufacturing cost, and to be free from the restriction of installation space. CONSTITUTION: A high water level sensor(5a) is installed at the upper part of a water tank(1). A second temperature sensor(6b) is installed under the high water level sensor. A low water level sensor(5b) is installed under the second temperature sensor. A first temperature sensor(6a) is installed under the low water level sensor. A control unit(8) is connected to the high water level sensor, second temperature sensor, low water level sensor, and first temperature sensor. An electronic valve(7) is connected to a cold water supply pipe(11). The control unit opens/shuts off the electronic valve, and controls the operation of a water heating unit(2).
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