I have an All Glass Aquarium (AGA) heater in my main tank and 10 gallon. The heater in my main tank is controlled by the AquaController Jr, so no worries about it possibly "sticking" in the ON position. I've got a 300W heater in my 55 gallon, and on the rare occasion that it turns on, it restores the proper temp in no time. The 50W heater in my 10 gallon seems to struggle to keep the temperature up.