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 Review

【High Quality Material】The shell of AQQA aquarium heater is made of PC plastic, much more heat-resistant than ABS material, can resist up to 180°C; The heating rod is made of explosion-proof and insulated quartz glass; Double sealing and waterproof, preventing leakage of water and electricity. Much safer for human and your lovely fishes. 【Intelligent Temp Control Range 61-90 °F】AQQA aquarium heater adopts nickel-chromium heating wire, features fast heating, high precision of temp control. The heater will power off automatically when reaching the set temp and will start heating again when the water temp is 1°F lower than the set temp. Alway provide a safe and comfortable living environment for your fishes. 【Easy Installation and Temp Setting】You can install it at any angle by 2 powerful suction cups, just make sure it is under water fully. You can set temp with an external temp controller, press the button for 3 seconds to switch beween °F and °C,and every press to adjust 1 °F /°C. Easily adjust the temp without hands getting wet. (Note: the controller is not waterproof). 【Heater Protection System】 With anti-dry heating and overheating protection, when the heater is not fully immerged into water, the aquarium heater will stop heating and alert, controller display "E1"; When the water temperature exceeds 95°F/35°C, the heater will stop heating and alert, controller display "HH". Protecting your fish from over-heat scalding. 【Warm Notification】Please note that the aquarium heater must be fully submerged in the water but don't bury it into sand or mud. Please put the heater near the water flowing area to prevent uneven heating and unplug the power supply when cleaning the fish tank or aquarium water changes. Any problems, please feel free to contact us.