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Zoom
10/08/2008, 08:40 PM
I always had external pumps and i don't think if will make any difference but i will asked this any way.
I'm building a new 50 G sump, i do have a Eheim 1260 for a return and a 1260 to feed the skimmer they are both external applications and i have them like this for years in all my sumps.
I have a change now to have them in sump submergible or i can have them external what way you think will add more heat to the water of my 250 total gallons of water or either way is the same heat added to the water , so far i don't need to use any chiller and i don't want to, my tank always stay about 76-79F even in the summer with the A/C on at 75F .
It is so much easier to have them submerged for cleaning but i need your advice here .
I need to have solid advice here for reefers that they have done this both ways not here say i need to pay and have this large glass sump drilled if the pump installation is going to be external..
Thank you for your time.

miwoodar
10/08/2008, 08:51 PM
Oops. I read the question backwards. I thought it was 'choose the pump that puts *less* heat into the water'. Switch one vote from external to the internal category please.

Put your hand on the housing of an external pump. Hot! That is all heat that does not go into your water.

sjm817
10/08/2008, 09:01 PM
The pump is water cooled whether it is submerged or not. It will add ~ the same heat.

pelochas
10/08/2008, 09:06 PM
<a href=showthread.php?s=&postid=13511116#post13511116 target=_blank>Originally posted</a> by sjm817
The pump is water cooled whether it is submerged or not. It will add ~ the same heat.

are you saying that an external -vs- submersible pump (of about the same gph) will add about the same amount of heat?

miwoodar
10/08/2008, 09:06 PM
sjm817 - what about the heat being put off by the motor on an external pump? I could burn my hand on my Iwaki if it did not have a fan on it. Wouldn't all that heat being going into the water if it were a submerged pump?

sjm817
10/08/2008, 09:10 PM
I'm posting specifically of using the same submersible, water cooled pump internal vs external. Zoom is asking about an Eheim 1260.

sjm817
10/08/2008, 09:18 PM
Here is a test that was done on a Mag internal Vs external. Yes, a different pump, but same idea. A submersible, water cooled pump run external and internal.
<a href=showthread.php?s=&postid=10350642#post10350642 target=_blank>Originally posted</a> by 8BALL_99
Well I didn't get around to testing till last night.. I decided to replace a vanity top in our guest bath.. Well that turned into getting a larger Vanity and top.. Then that turned into moving the water and drain lines.. Well then I had to patch the sheetrock where the old lines were.. Then I figured since I had my Sheetrock tools out I might as well go over some of the not so great seams in the room.. So then of course we had to paint the entire room a new color...Sigh so my 30 min job of a new vanity top turned into a weekend Bathroom remodel lol..Anyway


I tested a Mag12 both External and Internal. The test was done in a little less then 4 gallons of saltwater in a 5 gallon bucket. Also my Pump wattage might be a little on the high side.. My watt meter reads a little high.. It reads a constant wattage though..

http://reefcentral.com/gallery/data/500/71560DSC04976.jpg
http://reefcentral.com/gallery/data/500/71560DSC04977.jpg http://reefcentral.com/gallery/data/500/71560DSC04980.jpg
http://reefcentral.com/gallery/data/500/71560DSC04984.jpg
External Test-------------------------------Internal Test
Saltwater @ 1.025------------------------Saltwater @ 1.025

Start 7:07pm-------------------------------Start 12:38am
Water Temp 75.7---------------------------Water Temp 75.5
Pump Case Temp 79-----------------------Room 75
Room Temp 75------------------------------Pump Wattage 190
Pump Wattage 191Watts

8:07pm-----------------------------------------1:40am
Water Temp 81.9-----------------------------Water Temp 82
Pump Case Temp 98-------------------------Room 75
Room 75----------------------------------------Pump Wattage 192
Pump Wattage 194

9:07pm-----------------------------------------2:40am
Water Temp 86.6-----------------------------Water Temp 86.1
Pump Case Temp103-------------------------Room 75
Room 75-----------------------------------------Pump Wattage 192-193
Pump Wattage 194

10:07pm----------------------------------------3:40am
Water Temp 90.1------------------------------Water Temp 88.9
Pump Case Temp 104-------------------------Room 75
Room 75------------------------------------------Pump Wattage 194
Pump Wattage 194

11:07pm
Water Temp 92.7
Pump Case Temp 105
Room 75
Pump Wattage 197

12:07am
Water Temp 93.5
Pump Case Temp 105
Room 75
Pump Wattage 196

I didnt' bother testing more then 3 hours on the Internal It was getting late and as you can see pretty much The Exact same tempiture increase anyway.. Only difference is that the pump seemed to pull a few more watts External as it heated up faster..

I still plan on Testing a Eheim but I have a feeling the results will be the same.. IMO/IME mounting a Water cooled Internal pump as a External pump doesn't do anything but make it louder...

Will

miwoodar
10/08/2008, 09:38 PM
<a href=showthread.php?s=&postid=13511190#post13511190 target=_blank>Originally posted</a> by sjm817
I'm posting specifically of using the same submersible, water cooled pump internal vs external. Zoom is asking about an Eheim 1260.

Duh - I should have paid better attention to the OP. Agreed, essentially the same in this situation. You get a blue ribbon for attention to detail today! I get a bar of soap.

Zoom
10/09/2008, 12:26 PM
thank you very much sjm817 very good test .
I did contact The maker of the pump also and they said that the eheim 1260 will not make any difference in the water temp of my large volume of water in my tank externally or internally, actually they like for me to install the pump internally because the pump will run cooler and last longer and be quieter.
But i hate all the barnacles that they stick on the pump.