Simply the most technologically advanced heaters available today, the Fluval E series advanced electronic aquarium heater with VueTech technology delivers piece of mind by continuously displaying real-time water temperature. Equipped with an advanced digital microprocessor monitoring system with dual temperature sensors, the E series continuously monitors and displays aquarium water temperature, ensuring the well-being on your aquarium inhabitants. The 100 Watt model is ideal for aquariums up to 30 gallons, and can be used in both freshwater and saltwater systems. Includes 3 suctions cups, flat heater bracket, and angled heater bracket.