Anything over a hundred would be too much in my opinion for sure... Although even at 100 burning is not really a worry... I do not think there is a substance on earth that can burn at only 100 degrees...Very interesting! I keep mine at about 95 so I'm going to up it a shade. What would you consider too hot though? I'm always worried about my temps getting too high and burning them. I tend to be paranoid though.
Thanks a lot for sharing ! The hot spot in my leos' terrarium is around 100F now that the weather is getting hotter... (it used to be 95-97F), I need to get that thermostat fast !
You can put more layers of paper towel in there meanwhile, that should lower the ground temp by a few degrees.