Dual Pump Setup
With this setup pumps could be sized (flow rate and pressure) for a rad AND for blocks. Perhaps high flow/low pressure for a 1/2" rad and low flow/high pressure for restrictive blocks. Kinda like having a source of the coolest water possible and being able to ram it through the blocks. Or you could look at it as being able to select (tune?) pumps to specific requirements. And, why stop at two pumps?
Or, just buy an Iwaki20RZ(T)?
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