The problem with this, as Sage pointed out, is that burning wood or corn is very dirty.
While it is cheap to run these stoves you have to ask yourself, "What if everyone heated this way?"
The air pollution would increase massively and huge tracts of forest would have to be cut down to supply the wood (or pellets) to burn. While it seems OK that corn is used, I don't think there would be enough for all out needs.
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"My hands are on fire. Hands are on fire. Ain't got no more time for all you charlatans and liars."
- Old Man Luedecke
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