I just installed this heater a few days ago and it is large. It is approximately 3 inches wide, 12 inches long, and 2 inches deep. It has suction cups that are about 3 inches deep and they are sturdy suction cups that work well to keep it in place. It has been working for two days now and is holding the temperature very well. I've changed the temperature twice to see how it works and I'm really impressed with this heater. I definitely recommend this unit to anyone who needs a good and reliable heater for their aquarium.
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