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Your cart is empty.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.
Nik
Reviewed in Canada on March 2, 2025
Got this bad boy for my 20 gallon tank and it mostly works well aside from refusing to adjust temp. It turns on and off as needed but for whatever bizzare reason is determined to keep my tank at 83F/28C. Luckily I keep tropical fish but this is getting on the higher end of where I want my tank. Ideally I want it at 79f/26c.Even shutting down the heater and letting everything reset and setting the temp gauge way down low will still spike it back to 28C, it's crazy! It's wildly consistent at that temp, I just wish I could actually change it. This was a lot of money to drop on a heater that won't actually change temperature. I have had it for awhile now but I think I need to swap brands. My fish are existing at this temp and are fine and happy, but when summer hits I worry this heater is gonna end up being bad news and fry everything.Maybe I got a lemon, but it'd hurt to shell out this kind of money to find out with a second one.
Fred
Reviewed in Canada on March 19, 2025
Works very well!
Dave Anderson
Reviewed in Canada on December 15, 2024
This is a quality heater that is well made with a heavy duty card but it did need a major calibration. I set it to 77 F but it heated the tank to 80 F and was still going up. Don't trust the factory calibration. Luckily it is made with a red calibration ring.
Sam
Reviewed in the United States on November 15, 2024
Product works great. it runs a few degrees warm in my tank (set to 75, reading 78). Its been going strong for over a year now. It was a lot longer than expected, and I had to put it in at a slant on my 40 gallon breeder.
GT
Reviewed in Canada on October 17, 2024
Simple to use. Hearts up quickly and delivers reliable heat supply. No worries with Eheim.
Janine J.
Reviewed in Canada on May 17, 2023
I've been using this brand of heater for years. They are reliable and work great. Amazing price too. Cheaper than cheapo petsmart brand heaters.
Mary
Reviewed in the United States on November 7, 2023
I've had good luck with name brand pet store heaters over the years but I just bought Discus which are very expensive and "delicate". I didn't want to take the chance on the heater already in the tank as Discus need consistent warmer temps & the old heater is one of those preset ones with no ability to increase temps if needed. My house isn't heated so with winter coming on and night temps already in the lower 50s I wasn't going to take a chance on losing my new high priced fish. EHEIM is a well respected German aquarium product manufacturer and the reviews on this heater were excellent. The instructions are in more languages than I bothered to count which tells you this company is used world wide by aquarists. Some reviews mentioned temp setting dial not being accurate but I monitored mine continually for 2 days with multiple thermometers to be sure it was the temp I set it for with no issues. I only bumped the temp up a few degrees from what it was with the old heater but the fish demonstrated that those few degrees were exactly what they needed. Excellent color & activity in their new home including good appetites which can be an issue with Discus.
Laz
Reviewed in Canada on October 3, 2022
So far it’s working great I have waited for at least a month of continuous use before making a review and so far it’s good. It makes sense because it’s made from Germany. Should be a good quality. Also you should have at least a foot deep of water to use this because it has to be standing.
esli abundez
Reviewed in Mexico on October 15, 2022
Es de origen aleman no chino buena calidad
GeoCar Mom
Reviewed in Canada on February 5, 2020
I'd have given it 5 stars across the board, but I had to give 4 for accuracy, because it wasn't quite right when I first started using it. Luckily, the process to recalibrate it is very simple.The only negative I found is that it's long. I'm using it in a 20 gallon long tank, so the heater can't be installed completely upright. It's on an angle and I'm not in love with the way it looks, but I'll certainly get over it.Overall I'm very happy with it. The quality is noticeable.
dy.bl
Reviewed in Canada on May 11, 2019
The heater arrived in working condition. It wasn't damaged and is definitely heating the tank. However, I set it to 68°F, which should be 20°C, but the water rests at around 21°C, so it doesn't seem to be totally accurate. I believe there is a way to properly calibrate it, however, but it's a bit of nuisance to do, isn't it? It's set in a 10 gallon tank and seems to fluctuate by ± 0.6 degrees Celsius.It's also quite long, I think, for a 100W heater at 31cm. Almost the length of my tank.
Niranjan Ramamurthy
Reviewed in India on February 5, 2018
Living up to the company's reputation, the heater is efficient, durable and long-lasting. The holders, cord and instruction manual are also world class.There is a thermostat dial at the top, where you can set the temperature to a particular point. Note that you'll also need another thermometer separately to be sure of the accuracy. You'll need to adjust the settings per your second thermometer, which you can buy at affordable prices separately.One of the best features about such a high quality heater is that the temperature variation is very smooth, thereby not stressing out the poor fish.Important note - aquariums should NOT be set at a higher temperature (beyond 28-29C) because it raises the metabolism of the fish, thereby decreasing its life span. After a day or two of observation, I removed this heater because the city in which I live is usually warm.If I have an aquarium in Ooty or Bangalore, I might consider using this heater to maintain the temperature at around 27. If the surrounding temperature is beyond 27, you can turn this off.
Graham Turnbull
Reviewed in the United Kingdom on August 19, 2016
Heater was delivered the day after I ordered it as expected. It comes well packaged and even has a plastic ring around the bottom of the tube to protect it in transit. I would have liked it if the cord was a bit longer. If you have your electrics hidden in a cabinet like I do, you need the cord to be able to go down the back of the tank, down the back of the cabinet and then into cabinet to where the extension socket is. If you don't have your aquarium right next to a socket, you are going to need an extension.Some people wonder why this heater 'needs' to be calibrated. I think that the truth is you don't really need to calibrate it, you could just set it to a reasonable temperature depending on your stock and then check the temperature with a thermometer for the first 24 hours or so, adjusting up or down as necessary. I think that the reason for the calibration wheel is that it enables you to set the exact temperature (in half degree increments) regardless of the ORIENTATION of the heater. Most people will hang their heater diagonally, the instructions for this one say to place it vertically but I have heard of people placing it horizontally as well (to hide it behind plants for instance). You can imagine that depending on orientation, the the thermostat might read the ambient water temperature slightly differently.The other thing that I like about this heater is that it seems to be a bit more efficient than others I've looked at. I used the 100w model to replace a 150w Fluval model that exploded as I removed it from the aquarium (never do a water change without turning off your heater first!) Looking at other models of heater, a 150w model was suggested for my 129 litre tank. In this range, the Jager 100w seems to be enough. Not sure how this is possible, but it seems to work fine. Perhaps the heater is cycling less and that can only be a good thing in terms of the stability of the water temperature and the longevity of the heater.
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