My point was that wood although a good insulator, will not cause a heat pad to generate that type of heat. The reason being the back of the heating pad is exposed to air. The air also a very good insulator would begin to rise (hot air rises) and create a convective ploumb, very good way to dissipate heat (why it feels colder when it is windy out). Hence heat would be carried away by the air. So there would not be a build up of that type of heat without a short ciruit of some type. That is also why the whole back doesn't look burnt. If it was a build up of heat because wood being a good insulator the burn through would have occured smack dab in the middle of the heating pad, or over the whole surface of the pad. From the pic I would say that was a coner of the heating pad. It is all in the heat transfer, trust me on this it is something I know a little about.
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Derek Affonce

DeKeAff Exotics

dekeaffexotics.com

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