By the way I am really frustrated as to why those heat pads are not hot enough. They were hot enough and more when I tested in the day time, went up to 104F INSIDE the tubs. The temperature in the room was about 80-85F during the day. Then at night it was about 70F here and the temp in the tub was only 80 -85F! I don't see how the temps in the room dropped 10 - 15F, but the temp in the tub with the same heat pad got down 20- 25F. I am going to test it again tonight, just in case it was something else but man this made my day...
They would have been perfect. Perfect size, protective covering, no risk of overheating etc.