Its DAMNED interesting!
I have edited my above post to add a bar chart giving hydraulic power for commun pumps in these two systems. I was too lazy to add all the Iwaki pumps, so yeah there is a giant leap between the MCP650 and 30RZ!!
Surprisingly, there is very little difference between the pumps useful output in these 2 loops, hence the pump heat factor would probably make very little difference to the relative performance of these two loops...
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