I recently set up an Exo Terra 12x18x24 habitat with a 6x23 Ultratherm UTH for our first BP. I had been told that I could run the UTH without a thermostat and yet everything I had read was contrary to what I had been told by the shop that was selling all of the equipment to me.

When I measured the temperature on the bottom of the habitat, the Ultratherm UTH read a consistent 110 degrees. Needless to say, we added a Herpstat 1 before we added our BP.