Thanks for the advice and your concern. I will definitely make a change when I'm next on the boat. (Low power setting.)
How concerned do I have to be about our thru-hulls. Since they are below the water line, I'm figuring they are ok as-is, without any heat on the inside. (We have 22 thru-hulls. Yes, 22.)
Great minds discuss ideas;
Average minds discuss events;
Small minds discuss people.
The best minds discuss sailing, anchors, batteries, rode length, fridge-or-not, freezer-or-not, and guns-on-board. I don't know why. It's a mystery!