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A non vented, Blue flame heater burns 99.9% efficient and has no condensation. And (just a tip) with burning any type of fuel you should have a detector.
That is simply not true at all. The chemical reaction for the oxidation of methane (natural gas) is as follows:CH4 + 202 -> CO2 + 2H2OThat means that there is twice as much water vapor being produced than carbon dioxide. It really is as simple as that. Once the air in the shack/shanty touches a cold surface, the air temperature will be reduced to the saturation point and condensation will occur. Insulation prevents the air from touching cold surfaces and condensing.