Well Les, I can say from practical experience that an MD-30RZ (50Hz) model does indeed push about 12LPM through a single WW, and just over 7LPM with an Eheim 1250, and over 5.5LPM with an Eheim 1048. Will lose a little bit with a radiator attached, but the PD of a radiator is fairly low in comparison so long as the fittings are largish.
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