Jetsu Submersible Aquarium Heater - Glass 100-Watt, for Freshwater Aquarium and Saltwater Aquarium, 12 Month Guarantee, New Range of Aquarium Supplies FULLY SUBMERSIBLE AQUARIUM HEATERS: 100W 110V-120V 50/60Hz Strong Glass Aquarium Fish Tank Heater, perfect for Freshwater and Saltwater Aquariums. Includes 150cm cable for easy use TEMPERATURE SCALE: Can be adjusted between 20C~34C (65F~93F). Suitable for aquariums up to 25 gallons 1 YEAR WARRANTY: We believe in great customer service, if your heater breaksdown we will replace it CLEAR INSTRUCTIONS: Written in English. TEMPERATURE CONVERSION CHART: You can easily see Centigrade and Fahrenheit comparision for our Aquarium Heater