Ok, I have a problem with my UTH's shutting off on me. I have 4 UTH's hooked up to 4 dimmer's. Yesterday, I found all 4 UTH's cold (as in completely off). They still had power because the LED on the dimmer was on, but they were not heating. I unplugged them and replugged them and a they immediately started heating up again. I thought maybe a power glitch? Well I come home today to find 3 of the 4 cold again! Unplug...plug back in...fine. They are plugged into 2 different outlets on 2 different breakers. Any ideas??? The only other thing I can think of is maybe they shut themselves off if the ambient temp gets too high. I do have the room heated to about 82 deg with an oil filled heater. I know the dimmers have a maximum wattage of 300W, maybe they don't work so good with the low wattage of the UTH? Anyone care to take a stab at this???