Koolance PMP-500 Pump

Posted: December 13, 2012 in Pumps
Tags: , , , , ,

Photo Review


Above you can see screw holes in the heat-sink allowing mounting on the bottom or either side.  The heat-sink is a solid piece of aluminum that snugly fits over the coils.


If you unscrew the front top cover, the above is what you get, the impeller ceramic shaft is mounted to the top as is the impeller, but be careful about the water housing as it will be loose as well.


To remove the impeller you pull off a rubber tip (tip may be stuck in water jacket) and a washer.



Pulling the water jacket out reveals the coils and PCB, be careful not to let the coils slide out.

I would advise against taking the rest apart as it takes quite a bit of effort getting it all put back into place.  There is a plastic shield that slides over the back part of the coil that then slips into the heat-sink.  There is also the back plate that has really thick thermal pads and a floppy thick o-ring that’s loose. In all there are a number of loose parts to put all back together just right and it took me a few attempts working both ways before I got my sample back together just right.


Lots of individual parts..


A close up of the PCB

The construction quality was all very good.  The heart of the operation, the impeller is made very well and looks more like an Iwaki RD series impeller than your typical Laing or paddle type impeller you see in other pumps.  The ceramic shaft is also very large in diameter compared to other shaft impellers I have seen and the magnet is also almost twice as big.  Machining on all the parts is of high quality.  About the only thing I could pick on is the loosy o-ring in back as I don’t think it’s really sealing very well.  Fortunately there is a water jacket that isolates the PCB and any leaks would simply come out between this jacket and the top.  The top is made from quality acetal and looks perfect outside.  Internally it looks like a typical Koolance volute where a simple curve diverts from the impeller about half way around.


Partial spiral volute.  Could be refined further.


The impeller however is perfect and raises the bar on how to optimize. There is a nice radius on the inlet suction side and nice high pressure impeller blades.


Last but not least, note the 3A power requirement.  I wouldn’t go plugging this into a motherboard header unless it is capable of 3A or 36 watts.

Enough of that, let’s get it on with the performance testing!

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  1. Kevin Hua says:

    Finally, a pump that has dethroned the ddc series in all aspects! Nice testing Martin, I’ll be sure to pick up this pump! Maybe a custom pcb can lower power draw/noise… It’s using the old style transistors for power.

    • Martinm210 says:

      Yeah, if noise can be reduced via PCB and motor controller upgrades to say less than 40dbA max and a comfortable like tone that blends/hides well in your typical fan noise, that would be sweet. Add PWM to that and you would have one hard to beat little pump..:)

  2. nleksan says:

    So glad to have you back!!!!!!!!!!

    You are truly a pillar of the water cooling community, and if it weren’t for yourself and the few like you who have been so incredibly dedicated to scientifically analyzing and reviewing anything and everything water cooling, it’s quite likely that the hobby would still consist of a lot of non-modified aquarium pumps, semi-custom “water blocks”, and heater cores! I realize that you are a humble man, but take a moment to recognize the immense contribution you have made to “PC Water Cooling” as a whole, and if you’re ever nearby I’ll buy you a beer, hell, I’ll buy you a keg!

    • Martinm210 says:

      🙂 … Thanks!! and Cheers!!

      • Cole Markusen says:

        Not a problem. Might have to step up and buy one of Koolances controllers. The tone/pitch is almost unbearably annoying after long periods of time. Obviously the controller won’t get rid of it but lessen the severity a bit. Any idea what kind of components those controllers use? Would hate to have the same noise issue as the fan controller.

  3. Hi Martin,

    I lost my rubber washer (https://martinsliquidlab.files.wordpress.com/2012/12/koolancepmp500-16.jpg)

    I would like to know if my pump will get flooded or I can run the pump without.

    Thank you,

  4. Hi Martin, I just had a failure on my power supply just 20 minutes after starting my system with a PMP-500, an ATI 7870 and a FX-8350 oced to 4,6ghz, my power supply was a corsair GS700 with a single 12v rail of 56A, can you tell me what power supply should I buy to move all this without problem? Thank you!

    • Martinm210 says:

      I have had good luck with my TX650 and a single 570gtx card and hot hexacore, but I’m not up to speed on what the latest cards are drawing. I would plug it all into one of the online power calculators and base it on that. I would also check reviews on newegg on any model you are looking at and watch for how many bad reviews there are.