With the Jager thermostat and heater from Ehei,, you can help your aquarium maintain the perfect temperature. Equipped with precise control, simple recalibration and an easy-to-read control lamp, this top-tier thermometer helps you create a comfortable home for your finned family. Safely submerging in your tank, the Jager is built with an ultra-modern, unique design that encases the heating surface in laboratory glass—which helps it keep your aquarium's heat levels steady. It even has an automatic dry run shut-off, so you know your habitat is always safe, too! Whether you're looking to heat a 20-liter tank or your expansive 1000-liter aquarium, there's a range of sizes to choose from.
Helps you maintain an ideal temperature with detailed adjustments—from 18-34 degrees Celsius.
Fitted in a "jacket" made of special laboratory glass to increase the heating surface inside your tank.
Completely submersible, with a double suction cup holder for easy set-up.
Keeps a constant temperature, always holding your chosen level of heat.
Suitable for both saltwater and freshwater environments.
I’m sure the product would do it’s job if it worked. I set the heater up to 79 and it jumped my temperature over 85 killing two of my fish due to extreme temperature change, I immediately took it out and started messing with the temperature, I found out the red ring that moves the temperature level it’s working properly so as an example if I have set it to 71 it’ll get up to 77-78, I tried to play with the temperature again to try and get it working while I get a new heater (I need one due to cold area) and it wouldn’t even turn on anymore. Will try to return.
Its okay for a beginner tank. Not for a reef tank.
on Apr 24, 2021
The biggest flaw I had which made me give up on this heater is the fluctuations are too high, it goes from 74 -80.5 and its set at 78 so it wouldn't be the best option for a reef tank. Chewys service was outstanding though.
Hot Hot Hot
on Jan 16, 2021
First things first, turn the temperature down, and wait. It's important to calibrate the heater before you set it or assume that 77°=77°. I found that the heater is much hotter than the calibration it comes with, and seeing the other comments I would say it's safe to assume that they are mostly all this way. You will need a separate thermometer to calibrate the heater. This is an easy fix, just follow the instructions provided! My 1 complaint is that this heater is very bulky. I thought the glass would make it seem more discrete but I may need to look for another one considering I have a 5 gallon tank. (recently added mopani wood causing the tea-colored water)
Terrible product. Would not recommend
on Apr 12, 2021
I bought this heater 3 months ago and right off the bat I wasn’t happy it always fluctuated 1-5 degrees and now just recently I checked my temp and it was 72 degrees. It just totally stopped heating even though the light was on!
on Apr 7, 2021
The heater itself works great, however it was missing one of the suction cups. I know that sounds minor, but it didn't want to stay submersed without it. I was able to make a suction cup I had work.
Accurate so far
on Feb 4, 2021
After I purchased this heater and noticed the aquarium seemed a lot warmer than what my other aquarium is (set to the same temperature, different heaters) I brought out a thermometer and found out that this heater is holding the tank right where I want it, vs my Fluval E’s holding the tank 6 degrees low.
Here’s where it’s lost the star; the knob is quite difficult to turn at times.
Would recommend, but be cautious!
on Jan 18, 2021
I’ve been using this heater in my 10 gallon betta aquarium and it works wonders! The only issues I have experienced thus far is the turning of the temperature knob is rather hard, you have to use a lot of pressure. Another issue I have seen is that the temperature set on the heater doesn’t match the number on the knob at times. Other than that, it’s slim, holds temperature exceeding well, and is better than any other heater I have used in my years of fish keeping!
Would give zero stars
on Dec 28, 2020
First order, the heater didn't work at all. Chewy promptly sent me a new one. Second one worked but it absolutely sucks. I'm only trying to keep a 10 gallon tank at 80 degrees and the temp is all over the place! Sometimes the temp is as low as 69 degrees. The room tank is in is cold but that shouldn't matter. I finally had to put my cheap aqueon heater in that came with my tank kit so the tank stays at a stable 75 degrees. Even with the assistance of the second heater, it still can't bring the temp to 80 degrees! Very disappointed. Chewy customer service gets an A++ as always.
EheimJager make the best heaters
on Jan 28, 2021
This heater is great and the other Eheims I have had in the past worked great and I have never had one wear out. This one has updated features. Yoy just set the correct temperature and put it in place and it holds that temperature perfectly with no need to make adjusts at all.
It’s a good product
on Dec 30, 2020
I’ve tried multiple brands of heaters and they never worked. If you follow the instructions to set this heater up it’ll work great. I totally recommend this heater. I would say get a bigger wattage because the chart is not right. I have to turn the temperature up all of the way because it’s not strong. It keeps her water at a great temperature tho. Not too hot and not too cold.