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Old 01-26-2008, 04:30 PM   #1
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Jager heater problem

The heater has been on for 24hrs in my 55-gallon tank set at 78. Now, the temperature fluctuates between 80.0 and 81.0 (I know that it is only a couple degrees). I bought this specific heater because of the great reviews it has received. My question is: "Is this normal for heaters to do this a couple days after they are turned on? Or is this heater broken?"
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Old 01-26-2008, 07:50 PM   #2
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1degree variation is nothing really. How are you monitoring the temp swing(digital thermomoter) The size of the tank, size of heater placement of heater, Water flow around the heater,Lights, room temperature, all affect the temperature swing.

My house thermostat is always the same temperature 75 roughly. I have just 1 200watt Jager in my 46g tank Placed right in front of my skimmer pumps intake so the heated water flows threw the skimmer and gets distributed into the tank. It is set at 77degrees I measure the temperature using a floating glass thermometer it is at the 80degree line everytime I look at it. Really consistent. Very little swing and It really doesn't concern me if its 82 or 78 as long as it is consistent within 4degrees.
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Old 01-26-2008, 11:54 PM   #3
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I've found that most name brand heaters are very very consistent, but what temperature their "dial" is set to, and what the temperature is in real life are two totally different things.

Normal procedure with any new heater is to watch your tank temperature for a couple days and adjust the heater thermostat accordingly - ignoring what the heater "says" the temp should be.
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Old 01-27-2008, 01:48 PM   #4
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Did you clibrate the heater before use?
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Old 01-27-2008, 03:15 PM   #5
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I would like to know how to calibrate a heater. Didn't know you could do that.
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Old 01-27-2008, 06:17 PM   #6
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Yeah pull the blue knob upward, that releases the dial in the thermostat so you can correct it.

Place in bucket if water, set to temp. find variation of water temp and thermostat and adjust accordingly. push blue knob back down again.
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Old 01-27-2008, 07:42 PM   #7
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Well it does keep the water within 1 degree so I am happy with that, but I wasn't sure if I just got a bad heater or not. I'm going to adjust the heater and see where I get from there.
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Old 02-07-2008, 10:11 PM   #8
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So I turned the heater down to 65 and it was still reading high 70s, low 80s. Then I turned the heater up to 84 and it's keeping my water temp right at 76 degrees (give or take 1). So I called up Drs. Foster and Smith and they were extremely helpful and friendly, and immediately shipped out a new one. So I go the new heater (exact same) in today and did the whole "calibration" or bucket test. The same thing happens. I set it to 78 degrees and it goes up to 88, I turn it down to 74 degrees and it goes to 84.9. I don't know what the problem is! Is it common for heaters to be off 10 degrees?!
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Old 02-11-2008, 12:28 PM   #9
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+/- 1-2 degrees is common, but 10 is definitely not. At this point, it doesn't seem to be the heater.
Where are you putting the thermometer?
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Old 02-11-2008, 01:52 PM   #10
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as far away from the heater as possible
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