I think mine just gets pretty warm and not really what I would call hot. This is the second one that I have had on my boat. The first one about burned the boat, truck and house down while I had it charging in the carport. I was lucky that my son happened to walk by and see it smoking before it was too late. I know some folks keep them hooked up all of the time, but I just charge mine till they're done and unhook since that incident. I forget the brand of the first one, but it was kind of a cheap model from BPS.