Not as hot as your forehead.
Radiant Solutions Self-Regulating Heat Tape changes its heat output based on the temperatures of its surrounding environment. At any given point, depending on the temperatures outside, the cable could be a range of temperatures. However, its peak temperature is not very hot –typically between 60º-85º when operating in a cool environment. Another way to think about it is that as long as the cable is above freezing it will do its job, which is to create and maintain melted pathways through snow and ice.
This gives our Heat Tape a great advantage over the heat tape you can buy in ‘Big Box’ retailers, because it creates enough warmth to effectively do its job, but won’t do damage to surfaces that it touches. Additionally, our heat cable can be overlapped without concern. Heat Tape that is not self-regulating (i.e., ‘constant wattage’) can not do this (they have explicit warnings in the directions not to do this for risk of fire).
We have even witnessed a coil of crappy big box heat tape starting a fire because it got plugged in when it was still coiled. (Yikes!)