PURPOSE: A high efficiency flue tube-smoke boiler is provided to improve the efficiency by absorbing the heat loss due to fire bricks into water and insulating the front combustion chamber. CONSTITUTION: A high efficiency flue tube-smoke boiler comprises a front heating chamber(115) and a front combustion chamber(140). The front heating chamber is formed on an inlet part of a flue tube with a water containing space and connected to a water tank. The front combustion chamber connects a first flue tube(150) and a second flue tube(155).
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