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Eheim 3619090 Jager Aquarium Thermostat Heater 300W, Black

4.4 4.4 out of 5 stars 6,177 ratings

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300 Watts
  • Heater is meant for Tanks between 159-264 Gallons.
  • Size of Heater is 20” X 1.4” Diameter
  • Fully submersible, will automatically turn off when water level dips too low.
  • Thermo safey control protects against running dry.
  • Made of shock resistant and shatter proof glass for fresh or marine water.
  • On/Off indicator light for at-a-glance monitoring.

Customer ratings by feature

Suction power
4.0 4.0
Temperature Control
3.7 3.7
Accuracy
3.6 3.6

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Eheim 3619090 Jager Aquarium Thermostat Heater 300W, Black
Eheim 3619090 Jager Aquarium Thermostat Heater 300W, Black
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Price$25.15$31.99$63.72$92.80$39.99$42.99
Delivery
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Tuesday, Apr 2
Get it as soon as Monday, Apr 1
Customer Ratings
Suction power
4.0
4.4
4.1
3.9
4.3
4.2
Temperature Control
3.7
4.1
4.0
4.1
4.3
4.3
Accuracy
3.6
4.1
3.8
4.2
4.3
4.4
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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.

Product guides and documents

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Item model number ‏ : ‎ 3619090
  • Department ‏ : ‎ Home
  • Date First Available ‏ : ‎ June 8, 2005
  • Manufacturer ‏ : ‎ Eheim
  • ASIN ‏ : ‎ B003I5UC0W
  • Customer Reviews:
    4.4 4.4 out of 5 stars 6,177 ratings

Product Description

All 9 EHEIM Heater models are 100% fully submersible and come with a new TruTemp dial that allows the user to recalibrate the heater within a +/- 0.5F degree accurancy for precise temperature readings.

Customer reviews

4.4 out of 5 stars
4.4 out of 5
6,177 global ratings

Customers say

Customers like the quality, performance, and value of the pet supplies. For example, they mention it does an excellent job of maintaining the water temperature, works very well, and is well worth the money. That said, some complain about the fit and adjustability. Opinions are mixed on calibration, ease of use, and shut off.

AI-generated from the text of customer reviews

1,227 customers mention895 positive332 negative

Customers like the quality of the aquarium heater. For example, they say it does an excellent job of maintaining the water temperature, and consistently keeps it at a fairly stable temperature range. Some mention that the build is great and the surface area is great for even temperature control. Overall, most are happy with their purchase and recommend it to others.

"Easy to readjust and great quality." Read more

"...This unit works great holds the temperature perfectly and is a quality product with a extra long cord and shatterproof glass" Read more

"...added protection if the heater somehow shatters & it gives a little bit of heat protection for my turtles in case they hit their foot on the heater..." Read more

"Overall a great heater. The temperature is puts out is not accurate to what the settings on the heater are, but through trial and error you quickly..." Read more

627 customers mention498 positive129 negative

Customers like the performance of the pet supplies. They say it's durable, works well, and is happy with it' performance. Some mention that it works both vertically and horizontally, and that after calibration it operates perfectly. Overall, most are satisfied with the performance and functionality of the product.

"...I gave it a 4 star is because at this price point, it works well without any issues...." Read more

"...the heater still works great. i still have it suction cupped diagonally...." Read more

"I have three of these and they all work very well." Read more

"...It's been about 3 months and it is workng great, oscillating between 78.8 and 80.1 degrees...." Read more

229 customers mention190 positive39 negative

Customers like the value of the pet supplies. They mention that it's well worth the money, a great heater at a very good price, and reliable so far. Some say that the product is not cheap, but it'll be dead on the money for exact temps.

"...The reason I gave it a 4 star is because at this price point, it works well without any issues...." Read more

"...Other than that this is the best heater for the price and they last a long time as well.I hope this helps!" Read more

"...Pros: Price, sturdy build, greater surface area, almost perfect temp setting, stable heating, quietCons: Much longer length than other heaters" Read more

"...The price is great too, for such a quality product, its priced the same as the junk ones in the chain pet stores...." Read more

255 customers mention153 positive102 negative

Customers are mixed about the calibration of the pet supplies. Some mention that it's accurate out of the box, while others say that it was way off on its factory calibration. The directions on how to calibrate the heater are not helpful.

"...but on the plus side its extremely accurate...." Read more

"...I still have running, also no longer in production, has lost calibration by a few degrees, so it hasn't "failed," but Jagers now have a manual..." Read more

"...I decided to try the eheim based on online searches. So far seems very accurate (was 3 degrees off before calibrated)...." Read more

"...that lets you know its on, is fully submersible, and can be calibrated if it becomes inaccurate...." Read more

110 customers mention71 positive39 negative

Customers are mixed about the ease of use of the pet supplies. Some mention it's very easy to use and very precise, with easy to figure out controls. However, others say that the instructions are not clear on how to calibrate it, it'll take too long to kick off, and the controls are difficult.

"...Installation of the heater is easy and straightforward, with clear instructions included in the packaging...." Read more

"...something i'm disappointed about is it was hard for me to find instructions on how to recalibrate it, and because of that i think thats why i did it..." Read more

"...This heater is really easy to operate, warms the water quickly and so far seems to be very accurate (Although this is only my 3rd day using it) I..." Read more

"...features when it came to even temp control and easy to access and read thermostat controls.This heater comes pre-set at 80 degrees...." Read more

67 customers mention22 positive45 negative

Customers are mixed about the shut off of the pet supplies. Some mention that it automatically shuts off when they're out of water, while others say that it never turns off.

"...2 work fine, 1 wouldn't turn off until I unplugged it. I didn't bother trying to return it, so can't speak to that process...." Read more

"...Original review:Worked great while it worked, but it quit after only 19 months...." Read more

"...The heater also features an automatic shut-off feature, which turns off the heater if it is accidentally exposed to air or removed from the water...." Read more

"...a couple of days, it is heating continuously and not shutting off at the set temperature. I had to remove it as I could feel the warm aquarium...." Read more

215 customers mention62 positive153 negative

Customers are dissatisfied with the fit of the pet supplies. They mention that it's a little too big for their 5 gallon tank, huge in comparison to other heaters, and massive. Some say that the heater is a bit tall for a 5 gall tank, but it'll fit vertically in their tank after they dig a hole.

"...I wanted to purchase o e for my 10 gal tank, but it was too long and would not fit in the tank without being partially submerged I'm substrate." Read more

"...When I got the Eheim Jager, I found that it was HUGE in comparison to other heaters and wouldn't even closely fit in the allotted space in my show..." Read more

"...holds the temperature perfectly and is a quality product with a extra long cord and shatterproof glass" Read more

"...ordered the 200-watt and received the 300-watt, which was much too large for my aquarium...." Read more

148 customers mention21 positive127 negative

Customers find the adjustability of the pet supplies heater to be ridiculously hard to adjust. They also say the temperature adjustment knob is not very accurate, and the adjustable thermostat will be wildly inaccurate. It's hard to move the temperature dial once the heater is stuck to the wall. Customers also say they didn't find the adjustment intuitive and that no matter what temperature they set, the heater stays on continuously.

"...However, the temperature adjustment knob is not very accurate so it's hard to set it at a certain temperature...." Read more

"...well, and has awesome temp dial and calibration, the thermostat is too important of a part for me to give this anything more than a 1 star rating...." Read more

"...for which I did not give it 5 stars is because the blue dial is just too tight to turn...." Read more

"Besides being a little hard to set the temperature, which there are videos of how to do it on youtube, it holds the temperature perfectly...." Read more

Eheim 50 watt
5 Stars
Eheim 50 watt
To start this 50 watt model is about 9 5/8 inches tall. This has the red calibration ring which on mine should be adjusted to match actual temp but I find no need. I just use a second temp reader (in pic) and set accordingly as the set temp says 67 but really it’s around 73-74 I have this on a 10 gallon and while this is longer than most other 50 watt heaters this is adjustable and not a pre set heater which is a nice feature to have. I’ve only had this in the tank for 2 weeks so I can’t say about longevity but can update with any problems.
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Top reviews from the United States

Reviewed in the United States on February 24, 2024
Wattage: 25 WattsVerified Purchase
Reviewed in the United States on January 21, 2024
Wattage: 200 WattsVerified Purchase
One person found this helpful
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Reviewed in the United States on March 8, 2023
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Top reviews from other countries

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APRE
5.0 out of 5 stars Better than other heaters I've had.
Reviewed in Canada on March 3, 2024
Wattage: 200 WattsVerified Purchase
Carlos Armando Medina Isidro
5.0 out of 5 stars Buen producto
Reviewed in Mexico on February 11, 2024
Wattage: 125 WattsVerified Purchase
Amazon Customer
5.0 out of 5 stars Good quality, sturdy and steady temperature
Reviewed in Canada on March 30, 2021
Wattage: 25 WattsVerified Purchase
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Amazon Customer
5.0 out of 5 stars Good quality, sturdy and steady temperature
Reviewed in Canada on March 30, 2021
Using this to heat a 5gallon planted aquarium to about 79degrees and it does the job really well. The only downside is that it is a little big in size but other than that I’m happy with the purchase.
Didn’t need calibration and holds tank temperature steady. Very easy to setup and use. Solid build quality from the glass to the wire.
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Enosh D.
5.0 out of 5 stars It very good
Reviewed in India on May 2, 2021
Wattage: 300 WattsVerified Purchase
Kevin W.
5.0 out of 5 stars Works great, heats well, tankmates love the water temp
Reviewed in Canada on August 2, 2017
Wattage: 50 WattsVerified Purchase
One person found this helpful
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