thermostatic bottle heaters ?
 

like the ZEX heater with the built in thermostat are these any good ? does anybody but ZEX make one like that ? Just like a normal NOS one but 240w instead of 300w and uses a temp switch to turn off. I'm reading mixed reviews on it. I was wondering if anybody on here has used this type?



http://www.zex.com/zx/nitrous-add-on...le-heater.html