The Eheim Jager has been the default reef heater for two decades. Glass tube, accurate thermostat, and a near-zero failure rate over five years of continuous use make it the safe choice for any reef.

Accuracy

±0.5°F over a 75-gallon system — better than most competitors at twice the price.

Reliability

Two units running simultaneously over 60 months: zero stuck-on events, zero failures.

Verdict

Buy two and use them in tandem with an Inkbird controller for redundancy. ~$30/each.

Related reef reading

Reef tools mentioned in this article

🪸

Reef Tank Match Quiz

Find the right reef archetype for your space and budget.

Start quiz →
⚙️

Reef Equipment Planner

Generate a complete equipment shortlist for your build.

Open planner →
🧪

Water Parameter Tracker

Log every reading. Catch problems before livestock notice.

Open tracker →