Originally Posted by stephenronning
I had a diesel stove which was our heater on our 36 footer and I loved it. In my opinion it's superior to propane. However on my 25 footer I wouldn't even consider it. I'd choose propane. Thing about propane is it's wet. You may experience water on the headliner and stuff like that.
You're correct, one byproduct of propane combustion is H2O. Propane stoves and ovens will produce a fair bit of moisture in the cabin if used for long periods.
But most of the improved propane heaters, such as those sold by Dickinson (the Newports, for example), have sealed combustion chambers that exhaust all the moisture out of the cabin through a chimney. The chimneys are double-walled, so they also draw air for combustion from outside of the cabin.
Force 10 used to market a little bulkhead propane heater that lacked the sealed combustion chamber. If your only propane heater experience is with that model (now offered by Sigma, I believe), be prepared for a pleasant surprise!