Interesting thread. Just for sake of reference we live aboard half time and keep the boat on the Delaware. Our marina had four live a boards and a few that did it get pulled. We have a steel hull
as did two other live a boards. We did fine, even though at times it got to 1 F. For about a week or two we could walk around the boat on the ice. We are in a canal so we get good ice floes. Not all fiberglass
boats had bubblers, and all did fine.
We use an Espar for heat and only use shore power
to keep the batteries up. We do have electic heat for emergency
, should the Espar fail as I did not winterize the engine