Very happy with this heater. Compact design, and best of all, it only turns on after the water temperature has dropped 1 degree Celsius (2 Fahrenheit). what professional fish farmers recommend so that the heaters last for several years. Otherwise, if they turn on every 20 minutes, the heaters usually slow down for a year or two. The only small negative are the suction cups, which aren't the strongest but haven't fallen off yet.
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