Best Heat pad for a Plastic tub?

I have bought 3 heat pads so far, and none of them seem to work well, except one, but it wont stay at a consistent temperature, it also turns off on its own maybe once or twice a day. I need a good heat pad or heat tape that works well and doesn't cost too much. Please Help, Thanks!
:snake:

Heat tape will only work if your ambient room temperate is above 75. As for heat pads, which did you get? More importantly did you have them regulated by a thermostat?

Edit:for clarification do you mean a heat pad as in an uth or heat pad as in those disposable temporary travel packets?

Not sure what your price range is, but I know Reptile Basics has inexpensive heat tape, but you'd have to do the wiring yourself or request them to do it for you.

Depending on what size you need and what's considered within your budget, their Ultratherm heat pads are very high quality.