PURPOSE: A firewood steam boiler is provided to increase the temperature of steam using the combustion heat of the combustion chamber by letting the steam transferred passing through the inner upper part of the combustion chamber. CONSTITUTION: A firewood steam boiler comprises a combustion chamber(2), a steam water storage(22), and a steam supply pipe. A door(3) is installed on the front side of the combustion chamber. An air supply part(7) is installed inside the combustion chamber and isolated from heat. The steam water storage generates steam by heating steam water using combustion chamber. The steam supply pipe transfers the steam by heating the steam more using the combustion heat of the combustion chamber.
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