[whatsnewell]

I don't think you need to disconnect the hose. Should the hose freeze, as ccjohnson said, just turn on the water pump and use the on board fresh water until the hose unfreezes. Probably need to be sure the water bay heater is turned on to about 50 degrees even though the odds of anything in there freezing with the temps at or below freezing for a short time are nil. The problem comes in when it is below freezing for hours on end, or days on end. Then you need to disconnect the water hose, and keep the water bay heater on all the time.