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Old 01-23-2011, 03:06 PM   #1
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Eheim 300w heater

Does anybody have the same filter? How do you calibrate it? I know you're suppose to move the red dial to the left or right and then what? My heater is set to 80F but it will stop when it reaches 76F. Very frustrating.
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Old 01-23-2011, 03:58 PM   #2
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Old 01-23-2011, 04:00 PM   #3
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Moved to General Hardware and equipment discussion forum.
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Old 01-23-2011, 04:13 PM   #4
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I never trust the dial. Start in the middle of the dial, leave the heater in the tank for at least 30 minutes to let become the same temperatureas the water. Now plug it in most have a light to indicate it's on. let it run until the light turns off or the temp comes up to what you want. If the light stays on after your tank reaches your desired temperature then turn the dial down until the light goes off. Do not leave while adjusting. Use a separate Thermometer to verify your tank temperature. A cheep glass one is better the the stick on strips. Once you have it close move the dial in small steps and check every couple of hours.

A 300w is a large heater I use 2 in my 180 gallon. Two is case one should die.

P.S. I assume your talking heater and not filter.
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Old 01-23-2011, 04:24 PM   #5
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Quote:
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I never trust the dial. Start in the middle of the dial, leave the heater in the tank for at least 30 minutes to let become the same temperatureas the water. Now plug it in most have a light to indicate it's on. let it run until the light turns off or the temp comes up to what you want. If the light stays on after your tank reaches your desired temperature then turn the dial down until the light goes off. Do not leave while adjusting. Use a separate Thermometer to verify your tank temperature. A cheep glass one is better the the stick on strips. Once you have it close move the dial in small steps and check every couple of hours.

A 300w is a large heater I use 2 in my 180 gallon.
I have my heater set to 80F. Right now it is off and the tank temp is 76F. I have the small glass thermometer on the opposite side of the tank. Should I move the red dial towards higher temp? I have a 125g. Thanks. It seems to happen when I do my pwc and I turn off the whole thing(filter, heater, etc.)
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Old 01-23-2011, 06:05 PM   #6
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Yeah, just turn it up a hair more..

And yes, it is a good idea to have two smaller heaters than one if possible.

My aqueon heater is the same way.. Set to 82, but holding the tank at 78..
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Old 01-23-2011, 06:17 PM   #7
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Quote:
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Yeah, just turn it up a hair more..

And yes, it is a good idea to have two smaller heaters than one if possible.

My aqueon heater is the same way.. Set to 82, but holding the tank at 78..
2 heaters in case the other one malfunction, even heat distribution, more accurate temp?

Is it ok to add a 100w eheim and put it on the other end of the tank?
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Old 01-23-2011, 06:39 PM   #8
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This is a large tank, so.....

There are a couple ways to do the task.. I prefer my tank components to be hidden, so I have my primary heater set to hold the tank at 78 and a backup set to hold the tank at 76.. This way I can keep both of them hidden behind a home built cover for my filter supply line..

The other way, which most people seem to run, is to take the tank heater requirement (approx. 4-5watts per gallon) and divide by two to get the size for two separate heaters to operate together. One on each end of the tank to even out the heating..
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Old 01-23-2011, 06:53 PM   #9
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Quote:
Originally Posted by cjldad
This is a large tank, so.....

There are a couple ways to do the task.. I prefer my tank components to be hidden, so I have my primary heater set to hold the tank at 78 and a backup set to hold the tank at 76.. This way I can keep both of them hidden behind a home built cover for my filter supply line..

The other way, which most people seem to run, is to take the tank heater requirement (approx. 4-5watts per gallon) and divide by two to get the size for two separate heaters to operate together. One on each end of the tank to even out the heating..
The heater that I have claims to be able heat up 150- 200+g and my tank is only 125g. So there should be no problem. I'll just buy another one and have 2 heaters. Maybe an eheim 250w which is really for my tank size.
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Old 01-23-2011, 07:18 PM   #10
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Honestly, I'd get another 300w and put it at the other end.. That way if one fails, you have the other that will hold the tank fairly well..
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