Eheim Jager 150W Aquarium Heater

The Eheim Jager 150W Aquarium Heater delivers steady, precise warmth for mid-to-large aquariums in the 40–79 gallon range. With its adjustable TruTemp dial, durable shatterproof glass, and Thermo Safety Control, it's a dependable choice for keeping tropical fish and plants thriving — fully submersible, freshwater or marine.

Why aquarists trust the Jager

• 150 watts of reliable heat: Ideal for aquariums around 40–79 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? Sizing up or down? Compare the 125W and 200W Jager heaters. Browse all aquarium heaters or the full Eheim equipment lineup.

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