Our SkipperLiner spent 4 years in the water, complete with 4 winters in the ice. I bought a large waterfall pump (about 3000 gph) several years ago. It's much like a sump pump but for non-stop duty. I rigged a PVC 'spider' to it, that blows water out of 4 elbows. The pump sits in a plastic 30 gallon garbage can, with the spider tied to the can handles, that keeps it from moving around in the can. I drilled about twenty 2" holes in the can, just to be sure there's always water for the pump. The top of the spider is about 3' above the bottom of the pump. I tie the can & pump to the back of our diving deck so the pumped water exits the spider just at water level. The water is aimed at the transom. The pump is connected to a thermo-plug, that kicks on and off at 45?, so it's reasonably 'automatic'. I've used this pump thru 7 winters with no issues. It keeps ice from forming around the back of the boat and the drives. The rest of the boat sits in solid ice, never had a problem. Several sailboats in our harbor sit in the ice every year, no problem.
One possible problem to be aware of, is ice- If you're moored behind a good breakwater (I am), then ice shouldn't be a problem. But if your boat is exposed to big water, moving ice sheets, or Cadillac-sized blocks even, can ruin your day!
Check this video (this is our lake)
https://youtu.be/1AlDQrXnYeA
Also found this news story, also our lake!
http://www.heraldextra.com/news/loca...b8dccb7d8.html