Review on FEDOUR Submersible Aquarium Heater with Protective Cover, Adjustable Thermostat for 5-40 Gallon Fish and Turtle Tanks - Available in 30W, 50W, 60W, and 120W Options by Jennifer Collins

Have been using this heater for about 2 weeks. Looks nice and very big. When I ordered it said I was getting a 50w heater but it is actually 60w. But it works great for my 15 gallon tank. That's too much for anything under 10 gallons. It has a lot of holes and grooves in the tread so I had some issues with my Endlers trying to squeeze it in and test it (they fit). I've read reviews about temperature swings so I set mine a little lower than needed, which I didn't have to do because it was pretty accurate. The instructions are of course translated, but easy to understand. Overall this is a good heater and it looks very nice. The thermometer sticker seems to work great for me. I compared it to another sticker and my real thermometer and it was relatively close.