I would avoid Zoo Med ones. While I like a lot of their products, their UTHs are not one of them. They tend to get really hot and can melt a tub if unregulated or something goes wrong. As for pre made UTHs, I would check out either Ultratherm or Fluker's. They both are pretty much like heat tape but already made and packaged. Also you can check out Flexwatt or THG heat tape. Reptile Basics sells those and will wire them up for you if needed. All of those need a T-stat still. All of those I mentioned can be used on pvc cages too but obviously you would need get a size that will fit the tube as well the hot spot you want on the pvc cage.