Importance

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Abstract

The boiler is provided with: a boiler body in which the water level inside water pipes when combustion is stopped is lower than the upper ends of the water pipes; external water level detection means which communicates with upper and lower headers and detects a boiler body external water level; control means which controls the water supply means so as to lower the water level inside the boiler body when the water level detected by the external water level detection means reaches a first set water level; and header water level detection means which detects a water level existing inside the upper header by boiler water being pushed up by air bubbles. The control means controls the water supply means so as to lower the water level inside the boiler body when the water level detected by the header water level detection means reaches a second set water level.

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First Claim