Fluval E 50-Watt Electronic Heater Dual temperature sensors provide accurate and real time water temperatures LCD temperature display available in both Fahrenheit and Celsius; Range of 68 to 93 degrees Fahrenheit Fast heat technology built with a safety shut-off; Integrated fish guard to protect fish and invertebrates Equipped with a slim profile mounting bracket; Colored display alert system Suitable for aquariums up to 15 gallons; 50 watts; 5 year warranty