I once called a diesel heater builder to ask the price of his heater ($2,300) and he mentioned that it produces "Dry heat". I didn't know there is such a thing...after all, the heat doesn't put water in the air (see note below). I was on a boat recently that when the boat's 110 volt reverse cycle heater ran, the hatches were soaked during the night on the inside. Shortly later the heater stopped working so I used a little 110 volt pluggin heater and the boat was all dry on the inside. How could that be? What is the difference between the two heaters that causes this "Dry heat"?Note: I fully understand that the boat is supposed to have condinsation when it is warmer then the outside and it's humid. These different heaters though seem to point to something that dries out the air.I know this isn't about Heads but thought you (Peggy) might know.