[Talbot]

If I was going to plan to keep the boat in that location for a while, I would make absolutely sure that suitable changes were made to the boat. First and foremost would be a significant increase in the depth of insulation all around the boat and on the floor and roof. I would also make sure I could fit some form of secondary glazing to reduce the condensation. That will make the cost of heating reduce and also increase the effectiveness.

You then need to look at the ability to operate the boat from inside the cabin, or at least from a well protected steering position, and to have some form of heat available to keep the helm thawed!

Your boat would need fresh water cooled so that you could keep lots of antifreeze in the system.

Personally I reckon it would end up cheaper to do this to a new hull.