Grade 304L stainless is less likely to crack after welding than 409 'titanium enhanced'. Ductility is a measure of the material's ability to bend permanently without breaking, measured by elongation. In wood burning stoves, the intense heat will cause immense expansion and distortion. This creates high stress on the walls and welds. The higher elongation 304L/ER308LSi will absorb these stresses much better than the 409 steel. In fact the areas next to welds on 409 stainless have reduced toughness and are more prone to cracking than the 304L/ER308LSi combination. Small outdoor wood burning stoves can be automated or manual. Several units may also be placed in parallel for distributed heat to create a larger system. Pro-Fab Industries manufactures fully automated multifuel outdoor (or optional indoor) boilers that burn corn, wood chips, wood pellets, coal, and agricultural residue cubes ranging from 0.75 to 2.5 MMBtu/h Pro-Fab Industries Inc. reserves the right at any time to make changes or improvements in the design, material, or specifications of the Empyre Series of wood burning stoves or parts without thereby becoming liable to make similar changes in the stoves or any of its parts previously manufactured.
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