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Eheim JAGER Heater 300W

Eheim JAGER Heater 300W is a high‑power, fully submersible aquarium heater designed for reliable temperature control in large tanks. The Eheim JAGER Heater 300W features an adjustable thermostat, durable laboratory‑grade glass and even heat distribution, making it ideal for big tropical community and discus aquariums.

$90.00

Out of stock

PRODUCT Details

The Eheim JAGER Heater 300W is a powerful, fully submersible heater built to maintain a stable, accurate temperature in large aquariums. Using Eheim’s trusted technology, the Eheim JAGER Heater 300W is perfect for big tropical community tanks, discus displays and large planted aquariums where precise, consistent warmth is essential.
Encased in special laboratory‑grade glass, the Eheim JAGER Heater 300W offers a large heating surface and excellent heat distribution. The glass jacket acts as a heat shield, helping to prevent hot spots and ensuring gentle, even warming of the water. It is also shock‑resistant and designed to handle temperature changes safely.

Key Features of the Eheim JAGER Heater 300W

The Eheim JAGER Heater 300W includes:
  • Adjustable thermostat for precise temperature control
  • Fully submersible design for flexible placement in the aquarium
  • Special laboratory glass jacket for even heat emission and durability
  • Dry‑run protection on modern models to help prevent damage if exposed to air
  • Strong 300W output, ideal for many large aquariums
  • Reliable Eheim build quality for long‑term, stable performance
With the Eheim JAGER Heater 300W, you can maintain a consistent temperature range that suits sensitive tropical species, including discus and other warm‑water fish.

Suitable Tank Sizes for the Eheim JAGER Heater 300W

As a general guide, the Eheim JAGER Heater 300W is suitable for:
  • Large aquariums (typically around 300–450+ litres, depending on room temperature)
  • Big tropical community tanks needing stable temperatures around 24–26°C
  • Discus and warm‑water setups that often run slightly higher temperatures
  • Large planted display tanks where consistent warmth supports strong plant growth
Always consider your room temperature, tank volume and livestock needs when choosing the Eheim JAGER Heater 300W.

How to Use the Eheim JAGER Heater 300W Safely

To get the best performance from your Eheim JAGER Heater 300W:
  1. Place the heater in an area with good water circulation, such as near a filter outlet.
  2. Ensure the Eheim JAGER Heater 300W is fully submerged before switching it on.
  3. Set your desired temperature using the adjustable control dial.
  4. Allow several hours for the Eheim JAGER Heater 300W to stabilise, then confirm with a reliable aquarium thermometer.
  5. Always unplug and let the heater cool before removing it from the water to avoid thermal shock to the glass.
Regularly check your thermometer to ensure the Eheim JAGER Heater 300W is maintaining the correct temperature for your fish.

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