I would need more information regarding your set up to be able to properly answer your question, however, I can give you a few suggestions.
The heater must be completely submerged at all times when it is plugged in. If you are doing a water change, be sure to unplug it and let it cool down for a couple of minutes before starting the water change. Clean it regularly whenever you see algae or hard water deposits on it. Just use some hot water, white vinegar and a soft cloth. If your house temperature is fairly cool, basically less than 70 degrees Fahrenheit, the heater, which is calibrated for an average room temperature of 72 degrees, may have to work extremely hard to keep the water warm. In such situations, we recommend purchasing a heater of higher wattage instead, or having two heaters in the tank, depending on the size of the tank, and the normal room temperature.
I hope these suggestions help!
Date published: 2016-10-25