Eheim Jager Thermostat Aquarium Heater

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.

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.

I bought two of the 300 watt heaters. Over sized for what I need, but better to have more and reduce than not enough. One for a 75 gallon and another for a 55 gallon. I keep these tanks at 84 degrees and these two heaters keep the temperature constant. I've not see the temperature fluctuate more than a few tenths of a degree.

My tank is in an unheated and it is keeping my fish warm and cozy

This heater is the gold standard. It's great. It's also 9 inches long. Chewy shipped it in a 6 for mailing tube.

I needed to get a new heater for a 40 gallon tank so I decided to try the 150 watt Eheim Jager heater. I've only had it for a short time but so far it's been working great. I set the temperature at 78, let it sit submerged for 30 minutes and plugged it in. It brought the tank temp up to exactly 78 and stayed there. Most of my other heaters are off by a couple of degrees, but not this one. I really like it so far. It is solidly built, has a very heavy cord and the on light is easy to see. Based on my initial experience, I highly recommend the Eheim Jager heater.

So far so good!! I purchased this item for my Eastern Painted Turtle. As I’m a new “turtle mom” I’ve actually never had an aquarium heater before. The instructions were a bit unclear, so I had to look at some videos, however, I found that I could place the thermostat horizontally in the tank. So far my girl is enjoying the balmy high 70’s and seems very happy!

Good little heater work perfect. The controls are easy. Even when wet.

This worked for 2 days then suddenly stopped. Wouldn’t turn on at all. Nearly froze all my fishies.

I used this for my 40gallon turtle tank and its just what “they” needed!! Very well made! Bought the 75 gallon one just Incase I upgrade to a bigger tank in the future. I have it at 75 and it keeps it right around that temp. The dial is easy to see and it shuts off when temp goes higher. A nice red light u can see in the middle of the tube.