I use a Zoomed UTH on my 32 qrt. steralite tub and works like a charm. Have it hooked to a Herpstat and the basking temps are always right around 92.3-93.4. I also have a 60watt infared bulb about a foot away shining through the side of the tub on the coolerside. coolside is at 80, and warmside is at 86, and i already mentioned my basking spot.