dunedin
Well-Known Member
It is certainly easier on the systems if the boat is left in during the cold of the winter, although it makes sense to drain down the domestic water system as this is most likely to freeze up. Tube heaters in the right place, and some degree of dehumidifying is a good idea. I traditionally have lifted my boat every other winter, but was in fresh water, so less aggressive on anodes and antifoul. My new boat will come out in the spring for anodes and a/f.
Only time we have had issues with frost damage was ashore. We tend to depressure the domestic water (ie open a tap with pump off) when we leave the boat at the end of a sail, and keep one of the tube heaters close to the water pump/ filter. But so far, touch wood, not had any issues with this when afloat, even with air temperatures -10c or so - as the sea water is warmer than the air.