| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a boiler capable of preventing dropping of a water level in the boiler due to reduction of water supply capacity of a water supply pump even if cavitation is caused in the water supply pump. Ž<P>SOLUTION: The boiler comprises a boiler body 1, and a water supply path 2 supplying boiler water into the boiler body. The water supply pump 3 is provided in the middle of the water supply path 2, and water supply to the boiler body 1 is controlled by controlling starting and stopping of the water supply pump 3 on the basis of the water level in the boiler body. The booster pump 4 is provided in an upstream side than an installation portion of the water supply pump 3 of the water supply path 2, and if the water supply pump 3 is operated due to dropping of the water level in the boiler to a water supply starting water level, an operation time of the water supply pump 3 is measured. If the operation time of the water supply pump 3 becomes longer than a preset determination time T1, operation of the booster pump 4 is carried out. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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