Eheim Jager 250W Submersible Aquarium Heater

The Eheim Jager 250W Submersible Aquarium Heater brings reliable, precise heating to large aquariums in the 106–159 gallon range. With its calibratable TruTemp dial, shatterproof glass, and Thermo Safety Control, it holds a steady temperature in bigger freshwater and marine systems where consistency really matters.

Why aquarists trust the Jager

• 250 watts of reliable heat: Ideal for large aquariums around 106–159 gallons
• Precise TruTemp dial: Adjustable from 65–93°F (18–34°C) with a calibratable dial for spot-on accuracy
• Fully submersible: Mount it horizontally or vertically, freshwater or saltwater
• Shatterproof glass: Lab-grade, durable construction
• Thermo Safety Control: Automatic shutoff protects against accidental dry running

Setup & safety tips

• Place the heater near good water flow (by a filter outlet) so heat spreads evenly.
• After plugging in or before unplugging, wait ~15 minutes for the glass to adjust to water temperature.
• Always verify the actual tank temperature with a separate thermometer.

Not sure on sizing? Comparing the big Jagers? See the 200W or the 300W. Browse all aquarium heaters or the full Eheim equipment lineup.

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