Koolance PMP-500 Pump

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

Comparison Efficiency Curves

In addition, any time you are considering extreme pumping power, you should also seriously consider efficiency and heat dump as those affect diminishing returns.  More flow is always better, but gains are relatively small and more heat added to the loop will eventually cause more harm than the extra flow does good.  While I’m not testing actual heat dump, you can tell quite a bit by the power consumption and hydraulic performance.  The hydraulic power out can be calculated and subtracted from the power going in, leaving you with hydraulic efficiency. Pulling my old 35X data and my new tests, you can see that the PMP-500 is right at the top in terms of efficiency, approaching the 25% mark and that curve will slide to the left as you reduce voltage.


Good efficiency is also one indicator of heat dump as the remaining energy is lost through heat and noise.  Fortunately, the PMP-500 has built in a very large heat-sink.  In addition, the PMP-500 using a shaft impeller type system where the motor and PCB is very removed from the water.  Unlike a DDC which has not OEM heat-sink and very compact, the PMP-500 does have an included heat-sink surrounding the entire motor.  With the high efficiency, heat-sink, and characteristic of the heating components in the pump, I expect the actual heat dump to be extremely small and at like pumping powers better than any of the DDC or D5 options.

Here is the heat-sink temperature after 40min of running at 12V and 2GPM.  Ambient was 26C and the heat-sink is 40C without any air flow around the heat-sink, just convection.


The heat-sink is being put to good use, while not hot, it does get warm all the way around.  The thermal pads are doing a nice job of pulling heat away from the PCB and into the air here which means less heat dumping into your loop.  I imagine the heat-sink will continue to gain some temperature, but that is what I got after 40 minutes. The specs note 60C as a maximum temperature.

Regardless, the heat-sink is definitely pulling heat from the pump and PCB, very nice!

Pages: 1 2 3 4 5 6 7 8

  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.