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Old 08-23-2017, 08:31 AM   #1
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Ehiem Jäger Thermocontrol

Hi to everyone reading and potentially helping me out.

I've recently purchased Ehiem Jager 100w heater for a 90L, 23us gal aquarium. I am just wondering if anyone has the same experience as me or an answer to what's going on.

So I installed the heater yesterday to the filled aquarium with 26C water, the heater is set to 26C also so let it sit for an hour then plugged it in. It powered up straight away stayed on for 1 minute then turned off, great. Checked it periodically through the evening and it seemed fine however when I came down this morning the temperature was 25.2c and the heater was off. Then I noticed it had turned on, 25 minutes later it was still on and the water was 25.5C.

Looked like the heater was trying to get back up to 26C but why would let the water drop that low in the first place??

Anyone have a similar experience or know what to do. Bare in mind it's a brand new heater fresh out the box.

Thanks in advance!
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Old 08-23-2017, 08:34 AM   #2
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Eheim Jagers have to be calibrated. Once calibrated they are spot on. I would watch some YouTube videos on calibration of the Jager.
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Old 08-23-2017, 08:39 AM   #3
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Quote:
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Eheim Jagers have to be calibrated. Once calibrated they are spot on. I would watch some YouTube videos on calibration of the Jager.


I did see that they need calibration but though it would just work correctly at the wrong temp where as this doesn't seem to be working like my cheapo Chinese one does (15 mins off 1.30 mins on)
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Old 08-23-2017, 08:48 AM   #4
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Once I calibrated mine it was spot-on. It is the best heater I ever had.
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Old 08-23-2017, 08:52 AM   #5
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Great that's what I like to hear! I'll calibrate tonight.
Do I move the red arrow to the temperature it's working then move the blue temperature dial the the desired temperature?
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Old 08-23-2017, 08:55 AM   #6
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Yeah. It has been a couple of years since I have done that, but I remember rotating the dials.
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Old 08-23-2017, 11:28 AM   #7
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Do I move the red arrow to the temperature it's working then move the blue temperature dial the the desired temperature?
Yes. However, be aware that those heaters have about a two degree Fahrenheit spread so make sure you sample over a period of time. In other words, if you set them at 78 they will let the temp fall to 77 before turning on and 79 before turning off. In Celcius it would be less degrees but still basically the same theory.
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Old 08-23-2017, 11:55 AM   #8
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Ahh ok good to know thanks for that
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Old 08-29-2017, 08:32 AM   #9
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Looks like it's properly calibrated now as it shuts off and the desired temp of 25c however it drops to 24.7c then turns on for 26mins and shuts off for approximately 2 hours as it drops to 24.7c. Does this sound normal? My old heater was 2.30 mins on 15mins off all day and maintained the temp the same as the eheim is.
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Old 08-29-2017, 11:36 AM   #10
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The eheim's do not have a very tight window so that sounds normal to me.
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