About This

• SMART INVERTER TECHNOLOGY FOR UNMATCHED TEMPERATURE STABILITY -- hygger aquarium water heater features intelligent inverter heating that activates low-power operation when water temperature is within 1°F of the set point. The result? Unmatched temperature stability of just ±0.3°F. Critical for Discus, Angelfish, and sensitive reef corals.
• INTUITIVE TRI-COLOR RUNNING INDICATOR LIGHT -- The controller and heater sync with a tri-color running light system: Red (full-power heating), Orange (variable low-power adjustment), and Green (standby at target temperature). The digital screen simultaneously displays real-time wattage, making the heating status visually clear and easy to monitor at a glance—perfect for any fish tank heater setup.
• EXTERNAL DIGITAL CONTROLLER WITH EASY, PRECISE SETTINGS -- The external controller features a large LED digital display that shows current temperature (accurate to 0.1°F), set temperature, and real-time power consumption. Simply use the "+" and "-" buttons to adjust settings conveniently without getting your hands wet, ensuring a user-friendly experience.
• DUAL SAFETY PROTECTIONS WITH AUDIBLE ALERTS -- Equipped with two vital safety features: automatic shut-off when out of water and over-temperature protection. In case of any abnormality, the controller will immediately flash an error code and sound a buzzer alarm, proactively alerting you to issues and providing double peace of mind for your aquatic life.
• DURABLE, SAFE DESIGN -- Built with an 18mm thick explosion-proof quartz tube and nickel-chromium heating wire, filled with quartz black sand for superior heat dissipation. It heats up quickly to fight temperature drops after water changes, and the shatterproof design ensures safety even if your pleco bumps into it. Thickened ABS protective case prevents fish or turtles from direct contact with the heater element. Includes a free anti-bite cable wrap to protect the wire from pets.
• 300 WATT AQUARIUM HEATERS FOR BOTH FRESH AND SALTWATER -- 300w aquarium heaters are suitable for 40-80 gallon freshwater and saltwater aquariums, turtle tanks and ponds. Heater rod footprint 10.6"x3.3"x1". voltage 110-120V. Power cord from heater rod to controller measures 6.2ft in length. Controller to plug measures 3.9ft in length