Need more information

First, this heat tape is designed for metal pipe. Even though it says plastic pipe, I am a little worried about plastic pipe. My worry? If the thermostat fails in the "on" position, the factory could not tell me how hot the heat tape would get. I am concerned that it may get hot enough to melt the plastic pipe. So, major concern. In talking to the factory, they have self-regulating tape, but it gets too hot and its twice as much. I am just looking for a heat tape that will get to about 80 degree and is 15 feet long and NOT pay a fortune for it.

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