With EHEIM thermocontrol+ e, we offer you the aquarium heater of the future. Intelligent and ingeniously designed.

The EHEIM Thermocontrol+ e 300 W is a smart, digitally controlled aquarium heater with Wi-Fi connectivity. It belongs to EHEIM’s Thermocontrol+ e line, allowing you to set and monitor your aquarium’s temperature remotely (via smartphone, tablet, or PC), receive alerts, and integrate with other EHEIM.digital devices (e.g. lighting or filters).

It’s built for larger aquaria (roughly 600 to 1000 litres), where its higher wattage and features can be fully utilized.

Key Features 

• Adjustable temperature range: You can set the heater between 18 °C and 32 °C via app or device.

• Control accuracy: The device targets a precision of ± 0.5 °C in maintaining the set point.

• Deviation alert: If the actual water temperature strays more than ± 2 °C from the target, the system can send an email alert.

• Smart synchronization: It can synchronize with other EHEIM.digital components (e.g. adjusting heater behavior based on lighting or filter flow changes).

• Safety & protection:
    • Dry-run protection (Thermo Safety Control) prevents overheating if part of the heater is exposed or if water level drops.
    • Fully waterproof and submersible (IPX8). For optimal Wi-Fi performance, the heater should be immersed only up to a marked maximum level (so the Wi-Fi module remains near the water line).

• Materials & build: A laboratory-grade glass outer jacket provides even heat distribution, heat shielding, and a smooth finish.

• LED / indicator lights: Visual indicators show heating operation and status.

• Cable & mounting: Comes with a ~ 170 cm cable and includes a double suction-cup holder for secure placement.

• Guarantee: Comes with a 3-year manufacturer’s warranty.

Technical Specifications

• Power: 300 watts at standard mains (50 Hz) operation.

• Aquarium volume suitability: Intended for aquariums in the range of 600 to 1000 litres (depending on insulation, ambient temperature, etc.).

• Length / Height: Approximately 486 mm (48.6 cm) overall length.

• Diameter: The body is about 32 mm in diameter.

• Water compatibility: Suitable for both freshwater and marine (saltwater) setups.

Advantages of using EHEIM thermocontrol+ e 300 W

• The high wattage makes it suitable for large tanks, helping maintain stable temperatures even in less favorable ambient conditions.

• Remote control and monitoring reduce the need to physically access the heater, which is convenient especially in larger or hard-to-reach tanks.

• The alert system adds a safety layer (so you can act if something goes wrong).

• Integration with other EHEIM.digital devices allows more intelligent and adaptive control (e.g. lowering temperature when lights are off).

• Quality materials and safety design reduce risk of damage, overheating, or failure.

Considerations 

• The heater does not include cooling — if the ambient temperature rises above your set point, you’ll need additional cooling (fan, chiller, etc.).

• WiFi signal strength may suffer if the WiFi module is submerged too deeply; you need to respect the marked immersion limit.

• Setup and integration with apps/devices may require configuration (WiFi setup, linking to other EHEIM devices).

• Because it’s a more advanced piece of kit, it likely comes at a higher cost than basic heaters.

• The reliance on electronic controls means that in rare failure modes, there’s more complexity to troubleshoot compared to simpler heaters.