The UTH itself gets hot enough because the thermostat probe I have on it says it's up to temp, but the probe I have measuring the inside of the tub isnt hot enough. It usually gets up to temp no problem, but since I've moved to my parents it hasn't been. I tried elevating the tub off the floor so it won't build up heat under there and trick the probe into thinking it's hotter than it is, but that didn't work. I don't get what's getting in the way of heating the bottom of the tub properly. I use newspaper as substrate. Anyone have any ideas? I could just turn up the heat a lot on the thermostat, but it's at 100 degrees now and the inside only gets up to around 85. I don't get it. Thanks for your help!