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Old 10-23-2014, 04:05 AM   #1
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Does a return pump warm the water?

Hi guys,

I have a 75g sw tank, with a couple of corals and a few fish. Everything runs fine, numbers are good except for temperature. It is always high (+-84F) lately and I never had that experience before, since house temp is normally 70 or so, Seattle... I run a Mag Drive 9 or 9.5 I think and I noticed that if i turn it off the temp goes down. Is it because of less flow or may it be the pump itself? Help please
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Old 10-23-2014, 04:25 AM   #2
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I notice with a big pump i have to mix salt water it warms the water a little!!
As long as your temperature is stable it should be ok!!


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Old 10-23-2014, 08:01 AM   #3
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84 is a bit high. I would want it 80 or below if possible. Yes, any pump you add to the tank will warm the water, though I haven't experienced that kind of heat from a mag 9.5. Are you sure it's not coming from something else? What lights are you running? Though if you are turning it off and seeing the temp fall, the heat is coming at least partly from the pump.
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Old 10-23-2014, 08:16 AM   #4
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Here's a 3 min video from BRS discussing some differences between external, internal, and dual purpose pumps in terms of ease of installation, application, construction materials, and heat transfer.
In a test conducted in 5 gallons of 79 degree F water over 3 hours, the external pump raised the temp 7 degrees while the internal raised the temp 16 degrees. Not saying that the internal pumps are bad, they just need to be factored into your heat management plans.
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Old 10-23-2014, 08:19 AM   #5
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The above link does not seem to work with mobile devices Maybe it's just me. Let me try it again:



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Old 10-23-2014, 08:29 PM   #6
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Submerged pumps add significantly more heat than external ones do, like twice as much for the same flow. Easy to see why as the motors water cool unlike external pumps that air cool.

Pumps add heat.
Lights can add a lot of heat.
Even biological process's add a bit of heat.

I agree, 84f is too high IMO.


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Old 10-24-2014, 12:45 PM   #7
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Not for nothing, I recently ran into the same problem and found out that my heater wouldn't turn off. Even if I turned the knob way down.

In my 90 gal I have a Mag 12, Koralia 1450, and run a Tek T5 4-bulb and that seems to add about 3 degrees.


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Old 10-24-2014, 06:22 PM   #8
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Save up, get a JBJ chiller. Probably run you 350 for your size. I tried maintaining temp with fans and ice until I lost coral. I bit the bullet and got a chiller. No problems no mo.

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Old 10-24-2014, 06:34 PM   #9
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Quote:
Originally Posted by Peixe View Post
Hi guys,

I have a 75g sw tank, with a couple of corals and a few fish. Everything runs fine, numbers are good except for temperature. It is always high (+-84F) lately and I never had that experience before, since house temp is normally 70 or so, Seattle... I run a Mag Drive 9 or 9.5 I think and I noticed that if i turn it off the temp goes down. Is it because of less flow or may it be the pump itself? Help please
If your Mag 9.5 is used submerged it will heat the water. Nice things about Mag pumps is they can be used external too, reducing the chance of heating the water.

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Old 10-25-2014, 06:25 AM   #10
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I would do some research re using mags externally. I've been told by several hobbyists that they don't work as efficiently out of water and that's not the ideal application.

However, I have my return external and I still had heat issues.

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