UTH or other for tubs?

Hi everybody. I'm purchasing three new ball pythons in a couple months and I'm trying to gather up all the information I need beforehand. With tubs, are UTH's safe, or do I need to go with something like Flexwatt? If so, is there a guide somewhere that instructs users on how to set it up? Thank you for any advice you may have!

A UTH is just as safe as flexwatt...either can get too hot. What is important is to have a thermostat attached to control the amount of heat put out. If it's not too hot for your snake, then it won't be too hot for the plastic tub. ;)

Thank you Judy :)

I have actually been wondering the same thing! Good to know, now that I'm looking to add more snakes I'm looking into tubs.