Thanks, that was very informative! But based on what you said in your previous post, I wouldn't be able to use the Ranco brand with all 3 of my heating sources, unless they were all the same wattage? I have 2 UTH's (2 different brands I believe, one was already attached to the tank when I got it) & I have a 100 watt ceramic heat emitter. I wouldn't be able to use it with these, since it only comes with one probe?