Heating with ceramic heat emitter

[BeardeddragonDino]

I have an 18x18 tank that I will be using for a new reptile I am getting. I need to get it to about 90 degrees and want to use a CHE. What watt would I use to heat it so that I can still make sure part of the tank stays semi cool?

 

[CooperDragon]

I'd probably go with a 100 or 150w and either adjust the height so you get the temps you want or hook it to a thermostat. Since they don't give off visible light you can use an on/off or pulse thermostat and it should do the trick.