Fully submersible heaters work in any position (horizontal or vertical) to provide optimum aquarium water temperature. Temperature range between 65°F and 89°F. （500W： 65°F – 93°F） Sensitive and reliable thermostat maintains uniform temperature. Automatically shut off when the temperature is reached. Shatterproof glass SPECIFICATION: Power Length Recommended Tank Size 25W 7.25 5 to 8 gallon 50W 7.25″ 10 to 16 gallon 100W 10″ 20 to 33 gallon 200W 12.5″ 40 to 66 gallon 300W 13.75″ 60 to 100 gallon 500W 17.625″ 100 to 166 gallon Voltage: 110-120V 60Hz Diameter: 0.85 inch Length of power cord: 2.9 feet INCLUDES: 2 heaters Tips for Selecting and Using Aquarium Heaters: A minimum of 3-5 watts per gallon is recommended in keeping your aquarium at optimal temperature level. The use of multiple heaters in larger aquariums can allow even heat distribution. The heater should always operate under water. Please cut off the power and wait for at least 10 minutes before changing water, touching the heater or taking the heater out of water. Please don’t use in the water if the wire or glass tube was damaged
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