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I own both a 200W and 300W hydor inline heaters. My tanks stay a constant temperature, insanely consistent. Temperature variations throughout the tank are negligible. You can hear them click on and off sometimes, but that's basically the only con I can find in a long list of pros. At least it doesn't sit on the back of the tank and flicker... can't stand that.

Overall, it's the best heater I've ever owned and would recommend them without a second thought.
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