Filament Dryer (Work in progress)

I've developed and tested this dryer for a while now but have been reluctant to post because I couldn't find a heater that had the temperature rang required, and was safe and not so expensive as to defeat the purpose.

This is a work in progress, needing someone with more electrical knowledge to suggest a suitable heater. I've looked at lots of things like aquarium heaters, the elements that power these and heaters that are flat solid bars, but without the electrical knowledge, I can't evaluate if they will heat the space I want, or if I can supply them with power.