Reptile Basics will also provide a recommending size RHP based on your particular situation - size or enclosure, ambient room temperature, etc. I think you can't go wrong with either solution - Reptile Basics or Pro Products. I personally have all Reptile Basic RHP's. I've gone back to them because of good service. Again, I don't think either solution is a poor one.
UL rating is a board that certifies electrical components for safety and fire hazards. The following is conjecture, but I would imagine most all standard electrical components would be UL certified that make up the RHP's. So even in the absence of the official cert they may be just as safe, they just lack the official "stamp" stating so. As an example, when I used to do Controls work we would provide UL certified components for the Control Panels we designed. We didn't typically call in the UL board to certify the panel, because the components themselves were already certified. Only if a Customer truly wanted the UL certification did we go through the hoops of getting one - which cost extra. Just my small experience in the electrical world, obviously anecdotal only and again conjecture.
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