Phreenet:
Headheight, I guess, would just be the pump pushing water up a column that is the same ID as the pump output.
Now,
Adding inline flow resistance, whether it be from a radiator, or a waterblock or whatever, is basically the same as adding more headheight...ie, it adds more resistance to the flow of water.
What you could do is measure how many gallons it's pumping through your system in 1 minute. This would then tell you the EQUIVALENT head height your system is producing with all its inline flow restrictions.
Would be kinda interesting to know the equivalent head height produced by EACH inline item. That way you could buy a pump ahead of time and know how many GPH it could pump before even putting the pump in the system....hmmm
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