Well, I guess you learn something new everyday. I was going through all the old threads in this group before I found this group. I believe I read U.T.H, Which I assume means the under tank heat pad should not touch the glass. Is this true? In all the setup pages I have read on-line and the several books I bought it did not say anything about this. I have only read to put enough substance down so the heat wont burn. Also the hides I have been using and find easy to change and clean have been empty food boxes ,cereal boxes, etc. so they are a buffer between the heat and the snakes.

I did not know that the glass could crack.
Sting
Well, I guess you learn something new everyday. I was going through allthe old threads in this group before I ... so they are a buffer between the heat and the snakes. I did not know that the glass could crack.

As with any UTH (heat pads, heat tape, heat strips), there is always a potential of malfunction or overheating which can indeed cause the mentioned devices to generate enough heat to crack the glass on the bottom of your enclosure (as well a burn your animal).
All these devices should be used with a rheostat/dimmer switch to control the heat, and should be checked regularly with a temperature probe or heat gun to ensure proper temps.
~Wade
Well, I guess you learn something new everyday. I was going through all the old threads in this group before ... they are a buffer between the heat and the snakes. I did not know that the glass could crack. Sting

It is recommended to set the aquarium up off of the shelf so air can circulate under the heater. This will prevent the glass from cracking. Some of the heater manufacturers (i.e., Zoo Med) even include little plastic stick-ons to apply to the tank's bottom to elevate it. I've found that the little plastic stick-ons don't work well so I elevate mine with a piece of wood on oposite ends of the tank. In my experience this is enough to prevent the glass from cracking. snake lady