OK, so now hopefully one of the pump experts will chime in.
In the meanwhile, looking at the charts on the first page of this thread, the 50 performance appears to be between the Iwaki 15 and 20Z (closer to the 20) and heat put into the water looks to be about the same situation, so maybe use the graphs there to figure if this pump makes sense given the heat you're moving and your cooling capacity (how big a rad and how much air you push through it).
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