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Thermal shatter-resistant glass and dual calibration process make this submersible heater extremely durable and accurate to +/- 1 degree F. Unit switches itself off if the heater is not properly submersed, avoiding overheating and damage. An indicator lamp lets you know when it is on. Suction-cup clamps and UL approved 6 ft. power cord come included. Lifetime warranty. For fresh or saltwater aquariums. 50 Watts: for 5-20 gallon aquariums, 9” length. 100 Watts: for 15-40 gallon aquariums, 10” length. 150 Watts: for 30-55 gallon aquariums, 13” length. 200 Watts: for 55-75 gallon aquariums, 13” length. 300 Watts: for 65-90 gallon aquariums, 15” length.