SKU: 51584668027

EHEIM Jager Aquarium Thermostat Heater

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Description

EHEIM Jager Aquarium Thermostat HeaterFully submersible Thermo safey control protects agianst running dry. Will automatically turn off when water level dips too low TruTemp dial recalibrates the heater for percise temperature regulation Made of shock resistant and shatter proof glass for fresh or marine water On Off indicator light for at a glance monitoring From the manufacturer 19" rod for aquariums 159 264 gallons Calibrating your Eheim Jager Heater The reason Jager heaters have a

  • Fully submersible
  • Thermo safey control protects agianst running dry. Will automatically turn off when water level dips too low
  • TruTemp dial recalibrates the heater for percise temperature regulation
  • Made of shock resistant and shatter proof glass for fresh or marine water
  • On/Off indicator light for at a glance monitoring

From the manufacturer


19" rod for aquariums 159 - 264 gallons

Calibrating your Eheim Jager Heater

The reason Jager heaters have a reputation for being the most accurate heaters available is the ability to recalibrate the heater.

The factory setting should be reasonably close but if you moved either the red arrow or the blue dial before reading the instructions you may need to recalibrate the heater.

  • Features a shatterproof glass construction
  • TruTemp dial adjusts from 65° to 93° F
  • Thermo safety control enables 'running dry' protection
  • On/off indicator light verifies heater functions
  • Includes mounting bracket and suction cups
  • Simple and safe recalibration (±2 °C)
  • Generous 5.6 foot cord

Eheim Jager TruTemp Submersible Heater

300 Watts

Precisely regulated, constant water temperature is very important for the comfort and success of your aquarium inhabitants. The Jäger TruTemp adjustable heater is an ultra-modern electronic thermal device offering today's best technology. Designed for use in both freshwater and saltwater aquarium, Jäger TruTemp fully-submersible heaters include these great features:

Shatterproof glass construction - Made with laboratory-grade glass, TruTemp heaters are free of pollutants, resistant to chemical and biological substances, and able to withstand extreme temperature fluctuations. Their glass jackets also enlarge the heating surface and ensure even heat distribution.

TruTemp Dial - Temperature can be precisely adjusted from 18° to 34° C (65° to 93° F). Using the TruTemp dial with readjustment ring, the user can recalibrate the heater for a precise temperature reading. Control accuracy is +/- 0.5° C.

Thermo Safety Control - This safety mechanism enables 'running-dry' protection. The heater will shut off when removed from the water, and resume functioning upon return.

On/Off Indicator Light - This convenient feature eliminates guessing and enables the user to verify heater function without getting their hands wet!

Each Jäger TruTemp Heater also includes a mounting bracket and suction cups for secure and flexible placement within your aquarium system. Lastly, an extra long power cord accommodates most applications.

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SKU: 51584668027

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Martin Southard
West Palm Beach, US
★★★★★ 4
World War II - The Final Months
Format: Hardcover
The book takes you through the final months of World War II, focusing on eight key moments when the fighting finally came to an end. It’s not just a dry rundown of facts or battle maps — the authors do a great job of bringing the people involved to life, from famous leaders to everyday soldiers and civilians caught in the chaos. What I really liked was how the story moves around the globe, covering Europe, the Pacific, and beyond. It keeps the narrative fresh and exciting, giving a real sense of how the war unfolded on many fronts at once. Sometimes I had to pay close attention to keep up with all the locations and characters, but that only added to the feeling of being caught up in a fast-moving, gripping story rather than a history lesson. What stood out most was how it made me feel the human side of history—the fear, the relief, and the confusion as the war finally ended. It’s full of details, but it never felt boring or too technical.
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Reviewed in the United States on October 19, 2025
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Christian Schlect
Alexandria, US
★★★★★ 5
The Fix
Format: Hardcover
An insightful and interesting book on how our country's first legislators try to make sense of the new and fairly short U.S. Constitution, which, being drafted by humans, was bound to be imperfect. A lack of clarity on some point might be due to the changeable nature of words themselves or to confusion or obscurity of thought by the authors. And, who were the authors? The men in the room who came up with the product or the various state conventions that approved the final product? Professor Gienapp writes well and with a fine grasp of his subject. He uses concrete examples to illustrate his main points. For example, Congressional debates over the constitutionality of a proposed federal bank, the ratification of Jay's Treaty, and even whether the Bill of Rights was to be incorporated into or simply added to the original document. Most people think of U.S. constitutional history in terms of its drafting and ratification and/or its later judicial interpretation by the Supreme Court. Here, Professor Gienapp focuses on the initial work of interpretation by the first few sessions of Congress. This book is essential reading for those interested in the U.S. Constitution and the internal architecture of our government. I think those who spend countless hours viewing frenetic talking heads say this or that about the constitutionality of some issue or another (or the nomination of a justice to the High Court) should throw their television set out the window and, instead, settle into a corner chair and calmly read this and other such thoughtful books. This one should win prizes.
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Reviewed in the United States on October 14, 2018
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Gadavis
Omaha, US
★★★★★ 5
Excellent Book
Format: Hardcover
Stanford University History Professor Gienapp has done an outstanding job of researching and writing this historical analysis of the interpretation of the American Constitution by America's first Congress. Professor Gienapp analyzes data primarily from Congress's problems interpreting the removable of executive officers, chartering a national bank and approval of the 1794 Treaty with Great Britain negotiated by Chief Justice John Jay, the "Jay Treaty." Gienapp shows in clear writing how Congress used records of the debates at the Constitutional Convention and State Ratification Conventions to resolve these constitutional issues. I highly recommend this book to anyone concerned with the interpretation of the American Constitution.
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Reviewed in the United States on July 18, 2020
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Gary Y. Larsen
Carnegie, US
★★★★★ 5
An analysis of how we came to think about the Constitution the way we do
Format: Kindle
It provides a detailed analysis of the arguments used to talk about the Constitution in the ten years after it was ratified. These arguments shifted from treating it as a preliminary draft to be perfected through filling in the details of the operation of the government through experience, to a sacred document that had to be interpreted to determine its "true" meaning.
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Reviewed in the United States on December 18, 2018
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Connie Jones
Dallas, US
★★★★★ 5
Transcends the Historiography on the Constitution
Format: Hardcover
“This is the most important book to be written on the Constitution since Gordon Wood’s Creation.”
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Reviewed in the United States on May 9, 2020

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