Simply the most technologically advanced aquarium heater available today, the Fluval E100 Advanced Electronic Heater with VueTech technology delivers peace of mind by continuously displaying real time water temperature. Equipped with an intelligent digital microprocessor monitoring system with dual temperature sensors, this heater continuously monitors and displays aquarium water temperature, ensuring the safety and well-being of your aquarium inhabitants. Other excellent features include precision temperature control that allows settings in 0.5-degree increments, an integrated fish guard that provides advanced protection, and a slim profile mounting bracket. The E100 is a 100-watt heater that is ideal for aquariums up to 120 L (30 U.S. gal.) and can be used in fresh and saltwater tanks. Other models available: -A771 Fluval E50 Advanced Electronic Heater, 50 watts, for aquariums up to 60 L (15 U.S. gal.) -A773 Fluval E200 Advanced Electronic Heater, 200 watts, for aquariums up to 250 L (65 U.S. gal.) -A774 Fluval E300 Advanced Electronic Heater, 300 watts, for aquariums up to 375 L (100 U.S. gal.)