Pump vs. Heat Absorbtion Into Water Column

[Tunjee]

The time has come to change out my Velocity t-2 external pump. The problem, it heats the water up too much. What pump creates the least amount of heat absorbtion into the water column? Gen-X claims they do. Is this true or false advertising?

 

[sjm817]

The Velocity is a water cooled pump. Most externals are air cooled. Switching to an air cooled pump will make a big difference.

 

[Tunjee]

Are your external pumps air cooled?

 

[sjm817]

I have a Gen-X Mak4 as a return pump in my basement sump. It is air cooled.

 

[David Grigor]

Like many things in life there is always a trade off.

If your otherwise happy with the pump, the cheapest solution would be to try increasing the air movement in and around the pump and see what kind of improvement you get before switching out the pump. While I just stopped using the velocity pumps altogether I have heard reports that it can make a difference even with these pumps.

On a 72g bow switching out with an OR2500 run exteranally made a 4 degree difference. 82 being the low even in winter to 78.

 

[Tunjee]

So you swaped your velocity t-2 with an ocean runner and lowered you tank temp by 4 degrees? Good to hear! My tank's low is 81. This makes me really want to get rid of this pump. It's just too hot for my 20 gal. I wonder if puttin a fan on it would lower my tank temp 4 degrees?

 

[David Grigor]

Yep. This was in the wintertime so definately the pump was the main culprit. However I will add that tank also had glass tops which I'm sure was contributing some as not as much surface area for evaporation cooling, lights were just VHO so that wasn't causing signifcant heating of the water. The sump was open top though. I didn't hear about the reports that improving air circulation in/around the pump would also help until after I stopped using so may be worth a try first.

Immediately was able to keep 77-78 where as before 81-82 was the low.

 

[Tunjee]

I"m thinking about using this pump. I"ll have to fill or cover the existing hole in my sump, drill a new one just to get this new pump in there. My stand is very cramped. Here's the pump. Gorman Rupp makes it.
http://www.marinedepot.com/md_viewItem.asp?idproduct=GR1111

 

[Tunjee]

here's the velocity, tight on space for anything but a velocity it seems.

 

[Tunjee]

and after a few years.....

 

[Tunjee]

open top tank too