Review on HITOP Adjustable Aquarium Heater - 50W, 100W, 300W - Submersible Fish Tank Heater with Suction Cups & Thermometer Sticker - For Fish Tanks up to 60 Gallons by Michelle Godinez

I figured I could save a few bucks by installing a new fish stand. I ordered one to try before I buy 15 heaters. The first one I received arrived with a broken control knob. It wasn't damaged in transit, it was poorly assembled. The replacement was in the tank for two days and could not heat the tank above room temperature despite the constant light. He's coming back and I'm going to buy Aqueon heaters. They may be more expensive, but they come with a lifetime guarantee.