300W external aquarium heater is the first of its kind, designed for sump tanks and external filters. It provides precise temperature control between 18°C and 34°C (65°F - 93°F), ensuring a safe and stable environment for your aquarium. With its advanced electronic control system, self-protection features, and easy-to-use hanging eyelet for installation, this heater guarantees reliable operation and safety. It is also compatible with the PRIME external filter, making it a versatile and essential addition to your aquarium setup.