The best way to heat water with wood is with a gasifier and a well designed heat exchanger. I have reached far into the %90 range already. About %94 is my best so far. The problem.with the above product is that it steals heat from the chimney where combustion of gases is stilltaking place and there will eventually be a buildup of creosote. No non gasifier burner can burn clean enough to prevent this even with a catalyst.
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