Review on AQQA Submersible Aquarium Heater 500W/800W for 66-220 Gallon Fish Tank - Over-Temperature Protection, External Temperature Controller, 59-93℉ - Ideal for Marine and Freshwater Aquarium by Karina Rodriguez

I have had many heaters over the decades in my hobby and this one worked better than any of the others. The large LCD screen shows the set temperature and the actual water temperature. Shutdown beeps to alternate when the heater has shut down. I am very comfortable. The only thing you should pay attention to is the appearance of the heater. You must position it so that it does not spoil the beauty of your aquarium.