I'm not saying either/or. I've got a thermostat coming, but I don't see how I could run my UTHs and CHEs off of just one. Also, it doesn't seem to make a lot of sense to me to put the UTHs on a thermostat since they're there to provide a hot spot that's pretty much direct heat and shouldn't be affected by changes in room temperature that much. The way I see it, if I use a thermostat to regulate my CHEs to keep the tank at a constant 90ish hot side then keeping the UTHs set with a dimmer at a decent 98 degrees everything should stay pretty regular. Am I missing something big here?