Combustion cleaning needs
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:Though the catalytic combustor needs little upkeep, any ash that collects on the combustor may be cleaned gently with a soft brush. Its internal "honeycomb" part never needs cleaning, but should be replaced normally within two to three years. Some signs of needed combustor replacement are creosote build-up, excessive chimney smoke, and a general sluggish stove operation.
Noncatalytic Combustor Stoves ("noncats") burn wood within a heavily insulated firebox that ensures a more thorough combustion. Residual gases and soot particles are burned off in a secondary combustion chamber. Without a combustor to maintain, noncatalytic stoves do not require the level of care as catalytic stoves.