Abstract: A woodburning stove, fireplace, or the like which includes a hearth in a chamber with a flue outlet at a top thereof and a closeable bottom plate provided in a bottom of the chamber. A further chamber is provided under the plate, with the further chamber being lined with a refractory material. The further chamber includes a flue outlet duct to the upper chamber communicating at a rear end thereof so that flue from the fuel fired in the further chamber is substantially entirely combusted, with the combustion temperature being high and the combustion time for a given fuel supply in the further chamber being considerably longer as compared to the same amount of fuel in, for example, a conventional heating stove.