I have mostly visi therm, and I have 2 heaters that are of "less quality"
1 is in my 10 gallon and it is the heater that came with my 20gallon. It could not keep the water temp steady in that but it does an excellent job of it in my 10 gallon. That one is a Hydor made for All Glass Aquariums and is 100 watts. (I believe my 20 gallon visi therm is 150 watts).
The second one is in my 5 gallon and there is literally no way to turn it low enough to keep the tank at less than 82 degrees. Through the winter this was not horrible, but I am worried now that summer is upon us. I may unplug it and see how well the water holds temp without it running. That room gets the hottest. This is a cheap 50 watt heater (temp options are "low, medium, and high) by TopFin. The tank was used as a fry tank so I was not looking at high end equipment for it.
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