Thinking of switching them all to paper bedding....

[RetiredJedi]

...Since the heat mat would be controlled by a thermostat, there's no risk to the paper getting too hot and burning or something, right?
...

No, I think the flashpoint of paper is something like 424-474°F when it will spontaneously catch fire. It's called the autoignition temperature or kindling point or something like that.

EDIT: I want to add that it also depends on no chemicals being added to the paper too.