Without some form of regulation that UTH can be very dangerous. The worst part is that if the UTH should fail, they are known to spike at nearly 140 degrees. And you won't know about it until you check and find a cooked snake and a very sad day. Aaron (TheSerpentMerchant) has a great page showing some good thermostats for all budgets. I use the HydroFarm one myself and it works just fine.