I should have paid more attention to the previous reviews. I was hopeful because I was looking for something small for a 1 gallon aquarium. The first heater did not work at all, I had to wait over a week for the second heater to be sent. The second heater was only able to heat 1 gallon of water 3Β° above room temperature after waiting 36 hours to see if it would work. Unacceptable
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