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Non Gasification                  vs.                  Gasification Furnaces 



What is the difference between a traditional non-gasification and 

EPA qualified gasification outdoor wood furnace?


Traditional “Non-Gasification” outdoor furnaces typically require operating at higher temperatures for secondary combustion to reburn gasses which produces maximum efficiency.  In reality there are many variables which can compromise this ideal operational condition enabling a traditional outdoor furnace to burn with even marginal efficiency.  Therefore, a significant amount of heat is lost out the chimney along with smoke and carbon emissions.   Traditional outdoor wood furnaces have a reputation of burning almost everything and anything put in it providing there is already a good coal bed.   Since a traditional furnace needs higher operational temperatures in the firebox it also needs more frequent drafting which therefore also compromises it’s burn cycle to usually around 12 hours at best. Although there are many traditional models still in use, they can no longer be sold for residential purposes.   Non gasification outdoor furnaces however can still be sold for non residential applications maintaining a presumption that most agriculture and commercial users are distanced from residential areas.


Modern “Gasification” wood furnaces universally have some method of secondary combustion which facilitates ignition of unburned gasses for greater improved efficiency and lower carbon emissions. A modern wood furnace will re-burn gasses from the firebox in a matrix of plated steel or ceramic that allows combustion of these gasses at much lower temperatures than would ordinarily be possible. This is why among modern furnaces, gasification models tend to be much better at achieving low, even heat output, which achieves maximum efficiency. Drafting the flame down into a venturi for secondary gas ignition also means much less wood consumption. Therefore, many of the modern outdoor furnaces have smaller fireboxes while also affording up to a 48 hour burn cycle. The major caveat however of modern outdoor furnaces is they typically do not function well with wood containing more than 20% moisture content. Therefore users must exercise sufficient seasoning practices before use. Some modern furnaces now offer instant phone app technical data, diagnostics, and programming which can also aid overall efficiency. The EPA has also made it attractive to buyers of qualified efficient outdoor furnaces by affording an energy tax credit toward purchase and installation.


We are always happy to discuss your specific outdoor furnace needs and welcome you to contact us at 570-378-3099 with any questions you may have.