Since we made the mistake of having a UTH without a thermostat when we set up our Exo Terra habitat, I'll chime in.
When measuring the heat generated by your UTH, you must measure the temp on top of the UTH, not on top of the substrate above the UTH. Our Ultratherm UTH measured 110 degrees without a thermostat. I have read the the Zoomed UTHs are equally hot. From what I have read here an elsewhere, a 110 degree UTH can seriously harm your BP. Personally, I am appalled that Zoomed sells their setup without a thermostat.