Great find, Chris Bryant!
Thanks for the info, everyone. Since I have zero experience with LP heaters I have no idea what to expect. I had heard these things put out humid exhaust, but as long as that's going out of the cabin I'm sure I'll be okay.
My desire is for a low-level of heat that I can increase on demand by adding an electrical space heater. I don't like thermostat cycling because it ends up being either not enough heat or too much. And I really do walk around in a heavy jacket all day, so I don't want to use a lot of LP heating the cabin up to shirtsleeves temps.