Calibrating Ebo Jäger heater?
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Old 08-23-2014, 04:02 PM   #1
Richniner
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Calibrating Ebo Jäger heater?


Can anyone out there help or give suggestions on calibrating my Ebo Jäger heaters. I have a couple that even when set to 65 degrees are staying on and heating up my tanks. I read the directions on the newest models but why would they stay on? I examined t he insides and the heat elements all look fine. Why went set to the lowest temp would they be on? Some of them are like new and as you all know they are a pretty darn good brand...I am confused. Thanks for any relies.
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Old 08-23-2014, 04:42 PM   #2
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Which model heaters do you have, the ones with the buttons or the ones with the red/blue rings?

Also, which thermometer are you using to determine the tank temperature?
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Old 08-24-2014, 01:38 AM   #3
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Default Actually...

Thanks for the reply...I have both and I have issues with both. The button ones and red dials. I turn both of them down all the way and they are still running??? I use the ATI thermometers you stick on...but I have checked them with a digital thermometer and they are pretty accurate...still puzzled.
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Old 08-24-2014, 03:26 AM   #4
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That does sound odd. I know the heater will come on when you initially plug them in but once they reach their set temperature, they should shut off.

Were these heaters purchased new by you or are they used ones?
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Old 08-24-2014, 04:17 AM   #5
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"Like" New, so used? Either this or the heaters unable to read temp of water, but still able to heat.
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Old 08-24-2014, 04:47 AM   #6
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Angry Odd...

These are heaters I have had but were not in use for awhile. Like I said they look fine but I turn them all the way down and they stay on. That should not happen. With the button ones is there any special trick? I just thought pull up on the button and turn to the desired temp...then lock by pressing in the button? I have some of the MUCH older green Jäger heaters that work fine. Now I have the one with the red dial ... I follow the directions but to no avail...I must be missing something. Even watched a YouTube video to see how to adjust it. I am getting stumped.:mad
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Old 08-24-2014, 05:15 AM   #7
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Quote:
Originally Posted by Richniner View Post
These are heaters I have had but were not in use for awhile. Like I said they look fine but I turn them all the way down and they stay on. That should not happen. With the button ones is there any special trick? I just thought pull up on the button and turn to the desired temp...then lock by pressing in the button? I have some of the MUCH older green Jäger heaters that work fine. Now I have the one with the red dial ... I follow the directions but to no avail...I must be missing something. Even watched a YouTube video to see how to adjust it. I am getting stumped.:mad
I got multiple 50-500w jagers, never had that problem.
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Old 08-24-2014, 04:16 PM   #8
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To adjust the factory setting on the ones with the button follow these instructions:
- Unplug the heater
- Measure the water temp with an accurate thermometer
- Pull out the blue button as far as it will go. (sometimes I need to use pliers to do this)
- Set the temperature selector ring so that the indicator arrow points to the temperature you measured.
- Push the blue button back in as far as it will go

This method has worked for me in the past without any problems. However, it is always possible that the heater can no longer determine what the tank temperature actually is as agro noted above.

If you still want to use the heater, you can always purchase a separate heater controller unit that has a temperature probe and a thermostat, they are more expensive than buying a new heater.
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Old 08-25-2014, 12:04 AM   #9
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Are you sure it's not stuck on?

I've never bothered to calibrate a heater. Waste of time. All I ever do is put the heater in, move the knob until it just turns on then wait until it turns off then look at the thermometer to see if it is warm enough. Not right? Turn it a bit more. Once temp is right I leave it alone. The old heaters only had an arrow indicating which direction to turn it up. And face it those temp markings are only "around" temps anyway.
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Old 08-25-2014, 12:27 AM   #10
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I set two at the same temperature at either end of a 40 gallon tank and three thermometers attached to the front glass and after facing temperatures that were off by as much three degrees on either side of the tank I finally pumped them up to 85 (no fish, don't worry!) to see what would happen. They're closer together at this temperature (off by about one degree), but I'm still frustrated by the whole experience. Will give it another day or two and see if it straightens out. The whole process is made more difficult by the fact my house temperature is usually a degree or two warmer than what I set the tank at. I have an aqueon pro running in another, smaller, tank that has been spot on for over a year.

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Old 08-25-2014, 01:10 AM   #11
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Why would you return them? Because a stupid scale is off? Set it to the thermometer ans it should also be spot on to the thermometer. You guys have gotten lazy.


If your house is warmer than the tank why do you need a heater at all?
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Old 08-25-2014, 02:12 AM   #12
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I would return them if I feel they're not working properly. House is warm now, but it gets colder in winter. Don't feel that's lazy.

Last edited by psych; 08-25-2014 at 02:52 AM.. Reason: -
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Old 08-25-2014, 02:37 AM   #13
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It is highly unlikely for a sealed aquarium heater to be accurate. Even thermometers will have at least +-1f of permissible error, and the stick on ones are pretty much a crapshoot.

Even if your heater is bang on, without strong circulation it is easy for there to be a gradient across the tank.
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Old 08-25-2014, 02:41 AM   #14
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You're probably right. I owned an older Jager when I was back in grade school and feel frustrated by this experience and having to mess with calibration. Given the size of the tank and the lack of great circulation it's feasible there's a margin of error and I'm just being overly picky here.
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Old 08-25-2014, 03:04 AM   #15
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psych, when I first started with the heaters that can be "calibrated" I did "calibrate" it. I got the tank to the temp I wanted and moved the ring so it was spot on. Later I moved the heater to another tank it was off. That little ring means about nothing. It is telling you about where you are. Your real goal should be to get the heater to deliver the temp you want according to a thermometer you trust and pretty much forget about the marketing gimmick.
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