I have used human type heating pads for years as the sole heat source for my corns and kings, many of which are in plastic sterilite containers. The plastic would begin to melt long before a fire generating heat would be present. The beauty of these is they have a built in rheostat. I have never had to run them on high setting, low usually works just fine. I use Ceramic Heat Emitter's for my larger enclosures such as my Iguana and my ball pythons. They last for years!

I strongly disagree! Ceramic Heat Emitter's are great for heating large enclosures such as those housing iguanas and other large lizards. ANY heating device can burn if the animal is given free access to it or it isn't regulated down to a safe level.
Again I strongly disagree! Heat rocks are notorious for malfunctioning and causing burns on reptiles.

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Merlin,
What's Life Without A Little Magic!

Yes I agree with Merlin, i was a bit confused by the comment regarding the use of CHEs with igs,. a device like a Ceramic Heat Emitter should only burn if the animal is actually allowed to touch it. Either the Ceramic Heat Emitter should be placed too high away from the animal so it cannot get near it or ideally should be covered with a guard so that it cannot be touched. if it is covered there is no way the animal can get to it and therefore no way the animal can get burned.

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"If you know everything you may as well blow your brains out because the reason for existence is to learn more everyday." - Mark O'Shea, 2004