I have a heatmor outdoor wood furnace that I paid 3500$ for in 2001. for a thousand more I could have had the waste oil burner in it. Its made out of stainless steel. The fire box, flue, and door is all water jacketed. The door is water jacketed to pull as much heat from the fire as well as to prevent warping. I wouldn't trade it for anything and the company was honest and easy to work with.
I have burned wood, railroad ties, power poles, tires, weeds, waste oil, and more. If you manage your furnace right you can burn all that stuff without much smoke or stink.
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