The subject of the invention is a permanent burning fireplace-type furnace, enabling long-term operation of the furnace without simultaneous loading of fuel into the combustion chamber and enabling very clean fuel combustion, and very high energy efficiency. Regulation of the fireplace-type furnace is provided, which does not affect energy efficiency or the quality of combustion. The permanent burning fireplace-type furnace consists of a fuel reservoir (1), a preheating channel (4) for preheating of intake air, a primary combustion chamber (6), a secondary combustion chamber (9) and a smoke channel (12).