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A catalytic combustor stove lowers the temperature required to burn wood efficiently. The stove burns fuel slowly and also burns off smoke that would otherwise leave the chimney as wasted fuel. This type generally doesn’t need much cleaning. A non-catalytic combustor stove (a recirculating stove) uses a heavily insulated firebox that keeps the heat in and creates a more complete combustion. This type also has a secondary combustion chamber that burns off more gasses and soot.