I will add my voice to the choir. I live in ND, which is a state that has the dubious honor of receiving all of Canada's cold air. I accidentally plugged my UTH into the outlet instead of the regulator, and the temp immediately skyrocketed. Luckily I was just getting everything set back up after a full tank clean, so I caught it early, but it was just proof that the UTH gets much hotter than is safe when unregulated
