Until I bought something to regulate my UTH and a accurite thermo/hydro my UTH was at 130+ degrees. It was crazy. I dont know how my bp didnt get burned. Now Mine is at 105. Which I know it still high but rheostats suck. So im in the process of getting something to regulate mine. But Im not quite sure at what temp they get burned at.... mine seems to do really well at 105. And I check his belly regularily to make sure he isnt getting burned.