Eheim Jager Thermostat Aquarium Heater

By Eheim
Rated 3.9333 out of 5 stars


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$31.82Chewy Price
In Stock
FREE 1-3 day delivery on first-time orders over $35

About This Item


  • 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.

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Fish TypeTropical FreshwaterMarine Fish, Tropical FreshwaterBetta, Cichlid, Goldfish, Marine Fish, Tropical FreshwaterMarine Fish, Tropical FreshwaterMarine Invertebrate, Tropical Freshwater
Aquarium TypeSaltwater, FreshwaterSaltwater, FreshwaterSaltwater, FreshwaterSaltwater, FreshwaterSaltwater, Freshwater

Questions & Answers

14 Customer Questions

can i lay this heater flat down in the water
Answer by ChewyFeb 26, 2019
You may lay this heater flat as it's completely submersible, with a double suction cup holder for easy set-up.

Does this come with a guard so the animal doesn’t get burnt? Looking to use for my turtle.
Answer by ChewyFeb 15, 2021
Eheim Jager Thermostat Aquarium Heater 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.

How tall or long is this heater?
Answer by ChewyFeb 27, 2019
The approximate aquarium heater height for the 50 watt is 243 millimeters, the 100 watt is 319 millimeters, the 125 watt is 319 millimeters, the 200 watt is 406 millimeters, the 250 watt is 452 millimeters, the 300 watt is 506 millimeters.

Does this heater have a power cord?
Answer by ChewyFeb 09, 2021
This Heater runs on electricity and must be plugged in to work properly.

ReviewsWrite a Review

Rated 3.9333 out of 5 stars
75 Ratings
Would recommend to a friend

75 Customer Reviews

Rated 4 out of 5 stars
By Brittany on Nov 3, 2023

Jager Thermostat Aquarium Heater

I bought the 150 watt for my 60 gallon turtle tank. I can tell the difference, but I wish I would have bought the 250 watt instead. It is working well with the tank filled half way, but when I fill it fuller, the difference will be less noticeable. Super easy to install. I like that the suction cups attach to the glass, then the thermometer itself is able to be easily removed seperately from the plastic holders, to adjust the temperature.

Rated 1 out of 5 stars
By MattK on Nov 14, 2023

Bad heater

I’ve used these heaters for a lot of years, but for some reason, out of the last 6 I bought, 3 of them didn’t work. I’m try to get replacements through the manufacturer

Rated 2 out of 5 stars
By Roger on Oct 28, 2023

not working after 2 months

This heater hasn’t been working consistently since I got it now it doesn’t even come on less then 2 months old also very hard to change temperature settings just disappointing purchase.

Rated 1 out of 5 stars
By Philip on Nov 11, 2023

Do not buy

I’ve purchased 4 of these and they all stopped working within 1 year and Eheim doesn’t fulfill their warranty obligations.

Rated 5 out of 5 stars
By Timothy on Jun 1, 2023

the best thermostat I’ve owned

I have 3 of these thermostats, a 50 watt, a 75 watt, and a 100 watt. They were really easy to set up and have never strayed from the temp I set them at. I’ve owned them for over 6 months and never had a problem. I’d highly recommend this if you need the temp to stay at a temp such as 80 degrees for a pet that likes a certain temp.

Rated 5 out of 5 stars
By Charles on Nov 13, 2023

Eheim heaters

Work great in my 125 cichlids tank

Rated 5 out of 5 stars
By Ygehr on Feb 13, 2023

Good product

My Eheim is doing its job and keeps the temperature at 25 Celsius in a 90 gal. tank. It is fully submersible and that is good. Partly devices submersible encourage lime build up on the outside margins. I have hard water. In my Eheim I noticed a slight discrepancy between the temperature on the dial and the reading on the outside thermometer reads. I adjust the dial on the heater to get the desired temperature: 25 Cel. The outside thermometer(essential) gives a precise reading . This discrepancy does not bother me. In the past I had Tetra and Eheim thermometers and both lasted 2-3 years

Rated 3 out of 5 stars
By Carol on Feb 25, 2023

Not too impressed

I worked in the pet shop business for years. We always used this brand of heater in our shop display tanks. They always worked great, and lasted a long time. Unfortunately, the one I got appears to be working, but it's not heating the water. I'm bummed.

Rated 5 out of 5 stars
By Kristina on Jul 15, 2023

Very accurate heater!

I have eheim jager heaters in my tanks. Very nice heaters.

Rated 2 out of 5 stars
By Darkdazeys on Jan 3, 2023

be careful

Initially, this heater worked great. It kept the fishtank nice and warm, and our fish were doing very well. Then our fish slowly started dying. Our water parameters were good, but we still did a 50% change. Then, the rest of our fish were dead the following day. We deep cleaned the tank and put everything back, and then my husband inspected all of the elements in the tank- the gravel, the decor, the bubblers, the water pump, etc. He noticed that there was a crack in the heater, and water had gotten into it. We are not too sure whether or not this was the cause of our fish suddenly dying, but we're not taking any chances with our next batch of fish.