You may consider using a mixed-fuel burner, which burns wood pellets and corn. Though corn prices are rising alongside propane, natural gas, and electricity, mixed-fuel burners heat your shop with a source that may be nearby.
Clean-burning corn stoves surpass EPA emissions standards and don't create dangerous kerosene buildup. They burn corn kernels, which can be converted to ethanol by a fermentation process, instead of stalks or cobs. Unlike wood-burning fireplaces, corn burners don't need a chimney, though many do install as fireplace inserts. Most exhaust directly through any outside wall through a dryer-like vent.
Once lit, a corn stove can burn for 24 hours without stoking. Corn stoves generally self-feed by an electric auger, and you can set the auger speed to control the heat output. After burning, there will be some residue to remove from the firebox.
To avoid mold, clumping, and smoking, shelled corn should be clean with a moisture content no higher than 15.5%. If you don't have your own corn, contact your cooperative Extension to find local suppliers. Several manufacturers in the U.S. and Canada make quality, efficient multifuel burners, ranging from simple models to those with a number of high-tech features. Determine your needs based on your shop size and access to fuel.
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