Brian and others, thanks for the conscientious safety tips. I have the CO monitor necessity clear already, and actually some if not all of the propane cabin heaters by SIG and others have oxygen depletion cut-offs and air source arrangements not unlike modern building furnaces on land. Even the (non-marine) Little Buddy from Northern Tools has the oxygen depletion cut-off. And of course ventilation is a necessity. My curiosity (and hope) is that someone has installed a heater, and can give me a sense of placement, venting, any considerations toward or away from solid fuel vs. propane in terms of use and/or convenience, problems to avoid on the cabin top, and so on. Anyway, I hope someone has. If not, I'll post something when I make my choices. Enjoy the sailing season, David M17 #393