Eheim Jager Heater 25W 23cm 20-25L


In stock
* Electronic aquarium heater with advanced new feature
* Fully submersible aquarium heater with dry-run protection
* Recalibrate heater to ensure ideal aquarium water temperatures

We are authorised resellers: 3 year warranty backed by the Australian distributor, PremierPet.

High-tech electronic aquarium heater you can recalibrate for ultimate temperature control. Jager Thermostat Heater allows easy manual recalibration to ensure precision aquarium temperature regulation. Quality German engineering boosts heater performance for improved efficiency and fully submersible operation in fresh or saltwater aquariums. Shatterproof laboratory glass housing resists cold water shock and thermo-safety control shuts heater off automatically when water level dips too low. ON/OFF indicator light for at-a-glance monitoring of heater operation. Adjustable temperature range from 64°F to 93°F with +/-0.5°F accuracy. Six foot power cord. Maximum outside diameter on all heaters is 1".

Installation Instructions:

  • Check device for damage.
  • Remove transit protection.
  • Fix suction cups to double suction cup holder and clip onto heater (not near the heating spiral).
  • Mount thermostatic heater with double suction cup holder vertically in the aquarium, fixing it in a place where water flow is brisk (filter outlets/vents).
  • Set temperature.
  • Plug into electrical outlet.

Setting temperature

  • Turn the temperature selector ring to the desired temperature.
  • Monitor the aquarium water temperature using an accurate thermometer for at least 24 hours and make any necessary adjustments to compensate for calibration errors.
  • You should periodically monitor your aquarium water temperature with an accurate thermometer (Red light = heater in operation).

Note: The temperature selector ring should only be used as a guide. Always use an accurate thermometer for water temperature measurement.

If, after a day or two in operation the setting scale does not correspond to the water temperature, refer to the following procedure to recalibrate the heater:

  • Switch off the heater and unplug it from the electrical outlet.
  • Measure the water temperature with an accurate thermometer.
  • Turn indicator arrow (red) point to the measured temperature.
  • Set the desired tank temperature with the temperature selector ring (blue).

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Eheim Jager Heater 25W 23cm 20-25L

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We'll match a regular advertised price only, we don't match sale or club pricing. 

Price matching will apply to the total cost of the item, including any delivery charges.

Competitor’s product must be in stock in Australia. 

Product must be identical (e.g. same brand, model, and colour). 

Competitor’s advertised price must be current.

Price matching can only be done prior to purchasing from our store, we cannot price match on products already ordered.

We will not match overseas retailers, grey imports, fire or liquidation sales, auction sites, clearance and warehouse outlets.

Excludes bulk and commercial purchases.

We reserve the right to refuse any price match.


Please note: The wholesale cost of several lines has recently increased.

These wholesale price increases apply to the Red Sea, Tunze, Neptune Systems, Kamoer and Korallen-Zucht ranges, as such these products will not available for price matching temporarily. Once the price disparities between existing stock and the new higher priced stock have been resolved, price matching on these lines will be made available once again.