King snake heat pad watt?

Hello,
I am very interested in purchasing a California King Snake, and I was wondering since there hot spot temperatures are alot lower than Ball Pythons, would using a heating pad be okay for the hot spot? Also, what type of wattage of the heating pad should I get? I was thinking of getting Hagen Exo-Terra Desert Heat Wave Terrarium Substrate Heater heating pad ( Link posted below ) but, I do not know what wattage to get that will probably heat her, the cage size will be a 36 x 18 x 12 Exo Terra Terrarium ( link will also be posted below )
Any help will gladly be appreciated!
- Billy

http://www.petmountain.com/product/b...te-heater.html

http://www.petsmart.com/product/inde...AvailInUS%2FNo

The advice I posted on your corns thread will apply here too.

Not a big fan of either of those UTH here is the one I would recommend http://www.reptilebasics.com/ultrath...ater-uth-6-x11 nothing bigger is needed, and while you are at it make sure to purchase a RELIABLE thermostat.