Why is my water temperature running high?

Ryan1190

New member
My tank is 82-84 degrees throughout the day. I have 2 Jaeger heaters which I keep turning down, now set at 74. My place isn't that warm... Running LED's. Any ideas? My heaters don't seem to be on
 
It's a 50 gallon with sump. I'm in a 1 br apartment and its in the main living area. It's away from windows and direct sunlight.
 
I would try unplugging the heaters first and see what happens. My gf tank is in an apartment with window unit AC and her tank was running right around 83 we put a fan blowing across the water and it now runs about 79
 
I too would turn the heaters off to see what happens... and rather than relying on temp markings on them, do they not have an led that turns on when they are on? Or a red/green for on or on and heating?

Assuming no other outside factors (i.e. windows, lighting, ambient temp of the room), I would also check your pump(s) and/or power heads to see they are adding heat? And even if the tank is not directly in front of a windows, are you certain that sun light isn't shining through and hitting the tank at some point of the day?

Just some other thoughts... :)
 
+1 on the heater coming out and calibrating it. I just got 2 brand new jaeger heaters. 1 was 6deg high and the other was 5 deg high. Great heaters but they have the calibration for a reason. Unfortunately the calibration is only good for a max of 4 deg off.
 
Cool. I unplugged the heater so I'll keep a close eye on the temp. If not that Im thinking it might be an airflow thing like Rcook said I might need a fan blowing off heat or something.
 
It could also be your return pump, especially if it is submersible. What brand is it? I know the Mag drive series is notorious for creating heat. I use a mag 18 in my mixing barrel and if I forget to turn in off, by morning the water temp will be over 90!
 
It could also be your return pump, especially if it is submersible. What brand is it? I know the Mag drive series is notorious for creating heat. I use a mag 18 in my mixing barrel and if I forget to turn in off, by morning the water temp will be over 90!

Wow. I'm using an eheim pump. I felt it last night to see if it felt warm and it wasn't. Pretty crude test though
 
A good majority of pumps we use for aquariums are water cooled so a bad pump could be causing the water temp to climb also like someone else stated.
 
Maybe not failed, but it isn't true. My eheims were set to 76 before I got a controller and slowly creeped up to 82 with no equipment change.
 
Wow. I'm using an eheim pump. I felt it last night to see if it felt warm and it wasn't. Pretty crude test though

The pump is surrounded by water that is cooler than the pump. So the water pulls the heat away and keeps the pump very close to the water temp, which is going up due to the pump.

I have Jebao DC12000 pumps in use. One is submerged and one is external. The one in the sump feels cool, the external one feels slightly warm (not at all hot, but warm to the touch). Feeling your submerged pump is an almost worthless measurement unless it is running REALLY hot. Running 5 to 10 degrees above the water temp would be almost impossible to 'feel'.
 
First I would do is make sure that whatever you are using to measure temperature is correct. I can't be sure so I use 3 or 4 thermometers and use the average of all 3 to calibrate my apex temp probe.

Secondly, I feel your pain, I live in an NYC apartment and my temp right now is 80. I'm going to have to get a chiller this summer because I don't like fans over my tank and the increased evaporation.
 
You don't say whether your 50g set-up is a PNP set-up like a Red Sea Reefer. Some of these sorts of PNP systems have a hood with T5HO lighting, and an enclosed stand that contains the sump. Under such circumstances, most of the heat transfer from the tank to the surroundings is through the glass walls, and whatever warm, moist air leaks from the hood/stand.

If this describes your set-up, it's possible for the lights alone to heat your tank water significantly. So if you go through the equipment and don't find a problem, you may want to consider what you can do to actively vent the stand/hood, which will speed up evaporation and stabilize the tank temp.
 
I unplugged the heaters 2 nights ago and the temp is sitting at 78-79. The setup does not have a hood. It does have the sump in an open back stand. I measure with 2 different thermometers but neither of them are that great, they do generally agree within 1 degree though.
 
So - what's the temperature of the room that the tank's in? Depending on what you're using for lighting, return pump and circulation pumps, your tank may be running normally - 4-5 degrees F above ambient would generally be considered acceptable.
 
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