Body temperature.

[Coopers Constrictors]

And I disagree with your assertion that a 110 degree surface won't burn a snake. I think you're, frankly, an idiot to think that. Just because, somehow, your snakes haven't gotten burned by you using an unregulated heat mat doesn't mean other snakes were so lucky. My snakes shove aside substrate. Even with correct ambients, they will still shove away substrate and lay right on the heat and I don't doubt for a second that without a properly regulated belly heat they would burn themselves within hours. I don't have a single snake not with 82-84 degree ambients that won't lay right on the bottom of the tub against the heat.

This.

I hope that person is kidding about 110 degree hot spots. Poor snakes...