What do you have to control the UTH? The UTHs get far too hot and need a dimmer or a thermostat (thermostat being better and safer, dimmer being cheaper) to control the temps. Mine read over 130* before I set up my thermostat....
none, i picked up the smallest version of the zoo met Repti Therm under tank heaters, it did not come with any type of control (i found that weird too) the instructions just mentions the different ways to prevent any sort of burn for example, if you room temp can exceed 80 degrees (obviously not gonna happen now in NYC) do not us, always have a thick coat of bedding where the UTH is to prevent the snake from being directly on the UTH and the glass (which i do), and monitor the temp of the cage to make sure its not heating it too much, also no water on it as it can cause cracks, etc etc I do put my finger on it once in a while and it dosent seem like its that hot, its pretty much just warm at the most...

should i be using a different type of UTH? And now im not sure on wether to get a infrared heater bulb, or a ceramic, which works best? and how many watts for a tall 15 gallon tank?