Heater making water too warm?

Matthiasfanu

So I just set up my new 40 gallon aquarium and I put my heater in (aqueoun 150w adjustable) and set it to 76. I have a digital thermometer with the probe inside the water and the prob is reading a constant 81-82 degrees. The thermometer strip on the outside also reads 82. I unplugged my heater to see if I could cool water down then plug it back in but it's not going down. My living room is not 82 degrees and no direct sunlight hits the tank to my knowledge. What is going on??
 

Chaory

It probably needs calibration. I don't know if you can manually calibrate it or not, but I have a Eheim jager and it comes with manual calibrating. Not also accurate, but a few times of calibrating, it should work.

If you can't calibrate it, then either get another heater or you can just keep it, and just go by the thermometer instead of what it is set to on the heater.
 

EbiAqua

What kind of lighting do you have over the tank? I used to have a 10 gallon with two CFL bulbs in the hood, and without a cooling fan that tank would get in excess of 86 degrees.
 

Matthiasfanu

I have a 24 in t-8 bulb I believe
 

Matthiasfanu

I haven't been running it though. I even took the lid off my tank
 

Matthiasfanu

I cannot for the life of me figure out why my tank is running so hot. The heater is unplugged (for about 12 hours now) the lights have been off all day and I took the lid off my tank. There is plenty of surface movement from my filter but my water temp is a constant 82 degrees. I even floated bags of ice in the tank. The ambient temp of my room is in the mid 70s so I know it's not that. I even felt my canister filter to see if it was getting hot in the cabinet and it feels normal. Ideas??
 

MikeRad89

What type of fish are you keeping?

Water holds heat extremely well, it'll take a while for the temp to drop to room temp. If you can do a room temperature water change, or a water change at a temp necessary for the species you keep that would obviously speed up the process.
 

Matthiasfanu

I actually haven't gotten fish in there yet. Starting my fishless cycle on Monday so I'm going to do a big water change tomorrow with prime and see if that helps
 

BReefer97

I cannot for the life of me figure out why my tank is running so hot. The heater is unplugged (for about 12 hours now) the lights have been off all day and I took the lid off my tank. There is plenty of surface movement from my filter but my water temp is a constant 82 degrees. I even floated bags of ice in the tank. The ambient temp of my room is in the mid 70s so I know it's not that. I even felt my canister filter to see if it was getting hot in the cabinet and it feels normal. Ideas??


The water change should help. If you have trouble keeping it a lower temp, consider getting an aquarium chiller. BUT it doesn't sound like you should need one - since your room temperature is in the mid 70s, the tank shouldn't really exceed that same temp, in my experience it's usually lower than room temp.
 

BeckyAnn

I work at a LFS in Florida and because it gets so hot down here our ac's break down sometimes and we float frozen bottles of water in all of our tanks.
 

smee82

What other electrical equipment do you have running or is uour tank near any central heating vents or.the like
 

fissh

Sometimes when a filters impeller is having a problem, it will heat up the tank.
 

Tiny_Tanganyikans

What size aquarium? A smaller aquarium would not take long to get to room temperature, something has to be providing heat especially if you've put ice etc. You can't trust your sense of touch, do you have a laser thermometer? They're extemely cheap like 5-10 $ at walmart and will certainly allow you to pinpoint the source.
 

BeanFish

I think it would be pretty easy to plug out everything, see if the tank cool downs and if it does not then well, you better tell us your secret, if it does cool down plug everything slowly, give it a day between equipment and then see what heats it up.
 

Matthiasfanu

Sometimes when a filters impeller is having a problem, it will heat up the tank.

How would I check for this?
 

Similar Aquarium Threads

Replies
28
Views
1K
Pescado_Verde
Replies
3
Views
379
jdhef
Replies
3
Views
521
Jeff75
Replies
3
Views
425
Aleidam
Replies
42
Views
9K
FinFanatic

Random Great Thread!

Latest Aquarium Threads

Top Bottom