We keep our boat behind our house in Oriental, NC which is about 150 or so miles south of Norfolk. The creeks rarely freeze and the water temp stays above freezing a foot or so below the surface even if it does freeze, so no worries about thru hulls freezing.
I keep a couple of heaters set at 40 degrees or so, one in the main cabin and one in the engine room. I check the boat in the morning after a cold snap, ie 15 or so degrees. I don't winterize but I might if I were a long way away from the boat.
If we were to have a power outage longer than a few hours after or during a real cold snap, I would start the engine and the genset, warm everything up nicely, shut down and wait for the power to come back on. I might have to repeat that if the power were still out the next morning, but power has never been off for more than a few hours in the winter. Hurricanes are another story.
Norfolk gets a little colder, but not much. I doubt if you really need a bubbler.
David
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