The Eheim ThermoControl e 300 is a precision aquarium heater designed for reliable temperature regulation in freshwater and saltwater aquariums. This glass-encased heating unit features an integrated thermostat with electronic temperature control, ensuring stable water conditions for aquatic life. With a power output of 300 watts, the device is suitable for aquariums up to 300 liters in volume. The heater maintains water temperatures between 18°C and 34°C with an accuracy of ±0.5°C, providing consistent heat regulation. Its compact design measures approximately 45 cm in length and 2.5 cm in diameter, allowing for discreet placement in most aquarium setups. The Eheim ThermoControl e 300 includes a protective cover to prevent direct contact with aquarium inhabitants and features an LED display that indicates the operational status. Constructed from shock-resistant glass and corrosion-resistant materials, this heater is designed for durability in aquatic environments. It operates with low electromagnetic interference and includes safety features such as automatic shut-off when removed from water. The device comes with suction cups for secure mounting and has a power cord length of 180 cm. As a successor model in Eheim's aquarium technology series, it continues the company's reputation for precision engineering and reliable performance in aquatic temperature control systems.