50W Submersible Aquarium Heater for 10-20 Gallon Tanks, 8 in

Brand new, never been used Length - 8.07" 10-20 Gallons, 50 Watts Aquarium heater is an essential device for aquarium to maintain water temperature. Anti-Explosion submersible fish tank heater made from thermal shatter-resistant quartz glass, universal heater for marine, freshwater or tropical aquariums. Aquarium heaters keep the water temperature in your tanks constant on cold days. By providing the right temperature, it can help your tropical fish or other aquatic animals avoid getting sick because they can't adapt to low temperatures. The optimum temperature range for most fish is 76°F to 80°F. By rotating the Red knob at the top you can simply set the temperature from 65 - 92°F. The red indicator light on while heating, heater has overheat protection, when reach the temp it will automatic shut-off. Feature The fish tank heater must be fully submersible. It can be placed at a vertical or horizontal angle at your fish tank by using suction cups. Can be used in fresh or saltwater fish tanks. Maintain a constant warm environment for your fish's health. Explosion Proof: 2mm thick quartz glass, thicker than ordinary aquarium heater, quartz glass has shatterproof and leakage prevention function, will not be corroded by seawater, it is safer for people and animals using it. Overheat Protection: You need to set the desired temperature before connecting the power supply. The heating rod will automatically detect the temperature of the water during normal operation. When it reaches the set temperature, it will automatically turn off. The water temperature in the aquarium is lower than the set temperature, it will open automatically. Adjustable temperature range: Our aquarium heater can be adjusted from 65°F to 92°F (20°C to 34°C). The optimum temperature range for most fish is 76° to 80°F (25-27°C). Some species need to maintain a few degrees of high temperatures, while some species need to lower the temperature by a few degrees. Simple and practical: Our aquarium heater provide two suction cups for fixing to the aquarium wall. The aquarium heater need to be completely submerged into the water. The 100W aquarium heater is suitable for use in a 20-40 gallon aquarium. Indicator light description: All fish tank heaters have indicator lights to notify you when the heater is turned on. When the fish tank water heater is in the heating state, the indicator light is red. When the water temperature reaches the appropriate temperature, the aquarium heater stops heating, and the indicator light turns green.