We love to sail in the winter (Tennessee River, North Alabama) I installed a small propane heater sold at a local propane dealer that used the disposable canisters that are available at walmart.I think the name of the device is "my-buddy" and I've seen them in catalogues for hunting and fishing equipment. they were designed to go into tents and work like a convection heater. we love it and I can take it off during the summer, mounted it on the cabin bulkhead near the floor, the mounting screws just stay there year around. I carry spare propane canisters outside in the cockpit lockers. weight is about 2 1/2 pounds.
