PTC Heating Element

[bucknast]

I'm looking for some information on the equilibrium temperature of PTC heaters as a function of input voltage. How does the transition temperature change with voltage? or does it? Thanks.

 

[OperaHouse]

I did some experiments with ptc thermal fuses Thermally connectedto a series resistor. This was thermaly insulated and the temperature was monitored. There is a very sharp change in resistance at the transition point. In my test a voltage change from 10-36V varied the temp less than 1C. That was just a fuse. I assume a dedicated heater would be similar.