A Zoo-med UTH will be fine, but must be regulated by a thermostat and monitered with a probed thermometer. Without a thermostat the UTH can and will get hot enough to kill your snake, and could even melt the tub.
Stay away from thermostats sold in petstores as they are overpriced junk.
Here are 3 good thermostats depending on your budget:
Cheap: http://www.amazon.com/gp/aw/d/B000NZZG3S
Mid-Range: http://www.reptilebasics.com/ranco-etc-111000-pre-wired
Best: http://spyderrobotics.com/home/products.html
Here is a good thermometer. It can be purchased at Walmart for $12. It has 2 temperature sensors as well as a humidity sensor. Simply place the probe on the hot side directly over the UTH and place the unit on the cool side.
Putting foil over the sticky side of the UTH is a good idea.
Remember that UTH's don't heat the air in the cage all that much. This means that if the room the cage is in gets too much below 75 degrees a secondary heat source (like a space heater or heat lamp) will be necessary.
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