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In Reply to: Queston for a Chemist, or someone that knows one posted by Fisher1 on November 17, 2011 at 19:01:25:
gas is wet because the combustion of propane and air produces CO2 and water (for the most part). electric heat is only as wet as the relative humidity in the heating chamber.
charcoal is fairly dry but not as dry as electric as water is still generated. Wood totally depends on the type of wood and its moisture content. the resins in wood and its own moisture content (the reduction of which is the goal of aging wood) are freed during combustion.
So generically speaking, in order of dry to wet: elect, charcoal, wood, gas. but again the wood moisture makes a difference.
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