I'm using this heat mat on my Tub and it has a built in thermostat. Heats everything very nicely and was very cheap too. Doesn't have stick on side though
Reptile Pet Heating Pad Mat Bed, 110V US Plug Reptile Under Tank Warmer Mat Heating Mat with Temperature Controller (7W- 6x11 in) https://www.amazon.com/dp/B01MRGMD58..._BwIEWsD11vYsq
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