Hello, I am planning to get a ball python in about 20-ish days at a local reptile show, my tank is all set up, the only question is this. I got a Reptitherm UTH, and placed in my 20L tank. Many people say you are going to need to get a
dimmer/thero-stat or else it will get to hot. So I purchased a dimmer, but I noticed when I plugged it in the heat pad didn't get as hot as I suspected, it actually was quite cold still. So I unplugged it from the dimmer and straight into the wall socket, I gave it all night to warm up. Then I layed thermometer on top of the substrate. The reading was under 90 degrees. I then placed my hand directly on the glass, it was warm, but not really as warm as people were saying these things got. Then I placed my thermometer on top of the bare glass, and to my suprise it read just over 100 degrees. My question is this, is it normal for these UTH's to only be this warm, or did I get a defective one that isn't warming up as much as it should.

Mind that I have a little over 1" of substrate, and that I am also talking in fahrenheit.