In my area, boatsafe is the heater of choice. I can only think of one person who winterizes his fresh water system that leaves his boat in the water. That is because he disappears in November and reappears in March. He does not winterize the engines He uses a boatsafe in the ER. The boatsafe heater is preset to go on at 45*F and off at 55*F. They recommend you have snap in canvas covers made for the ER vents to keep the breezes out. A friend keeps his Regal on a lift behind his house and has not had a problem in the last 2 years. He uses a boatsafe as well. Shy of the 1997 ice storm, you should have no problems at all. I am inland of you and plan on doing the same thing as you are. For the cabin, I am using a quartz heater and leaving storage compartment doors open. Boatsafe is the one ER heater I know of, but there may be others that operate as well. My tune would change if I lived in moose country.