I use ZooMed UTH on my makeshift snake tubs and terrarium. Have them both hooked up to a herpstat and they heat just fine. I get a steady 90-91 reading on my herpstat with +/- a degree on digital thermometers slotted in the same area as well. I had no trouble bumping them up to 95 or as low as 85 with the herpstat. Definitely use a thermostat of some sort with any UTH. I have the hydrofarm ready just in case and I use it when I travel to shows and have to stay for a couple days in an area. Its temp probe isn't that accurate but it still offers some control on the heating.