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Old 02-20-2020, 05:34 AM   #1
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Submersible Pump Heat

Hi, I am running a 200 gallon freshwater tank with an open sump, below-tank filter. The submersible pump is an Oblong FS-7000 (rated at 1200 gph at zero head). It was made in China, came with the aquarium package, and there is little to no online information available. It's doing a fine job at pumping water, except it seems to be adding a bit of heat to the water. I know that any submersible pump will necessarily add some heat, but my question is, are there particular pumps known for low heat production (high efficiency) that I could consider as a replacement? It's also just a little noisy: not too bad, but a quieter pump would be better in our living room. So, two related questions: a pump with lower heat production and, hopefully, less noise.
Thanks!
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Old 02-20-2020, 11:29 PM   #2
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Not sure about pumps options in the large size tank/sump.

Sometimes filters and pumps take some time for some bacteria to form in them almost like a bit of cushion and also for the motors to wear in some and they maybe will get more quiet.

If it "came with the tank" and it has been used a while and not a new item, it might be worn some, or of less quality unfortunately.
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Old 02-22-2020, 06:45 PM   #3
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Thanks

Thanks Autumnsky: I think quality could well be the issue. I think I'll track down a replacement and keep this one as an emergency spare.
Cheers!
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Old 02-23-2020, 08:33 AM   #4
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Look into DC pumps like Jeboa .
https://www.amazon.com/s?k=jebao+dc+...l_81oti12usr_e
They are silent ,do not transfer heat and have digitally controlled flow meaning when you slow the flow you save electricity ..
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Old 02-23-2020, 05:23 PM   #5
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Thanks Mr Bandit, I will: can you tell me if the AC to DC inverter is inside the pump housing (submerged) itself, or is it in the external controller (inverters generate heat). Also, I understand the DC pump curve drops off a little quicker than AC, is that right? For, say, 4m/12' head (including fittings and elbows), how much more flow would a DC unit be expected to lose, compared to an AC? Thanks again, Cheers!
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