| 摘要 |
PURPOSE: A fuel saving hot water supply boiler of a low pressure-direct heating type is provided to reduce the manufacturing cost by simplifying the structure, to improve heat efficiency, and to save fuel. CONSTITUTION: In a fuel saving hot water supply boiler of a low pressure-direct heating type, five combustion chambers(1¯5) are installed to the lower part of the inside of an expansion tank(15). Direct heat exchange is performed by the five combustion chambers without a supplementary water pipe. A self-heat exchanger(11) for the boiler is installed to a combustion gas outlet(10) connected with the fifth combustion chamber and direct water is circulated, applying the exhaust heat exhausted to the atmosphere. Thus, warm water of average 35 degrees centigrade is made and is sent to a direct water inlet pipe of a high temperature tank. Accordingly, the time for operating the boiler is reduced and fuel consumption rate is reduced.
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