This question is very open ended, and brings up more questions about your particular rig to be answered properly. The main questions hover around the amount of heat you plan on moving versus the zones to be heated. The ideal pump will be sized so it can deliver a little bit more than average flow rate necessary. Sometimes it will lag in peak capacity, but that's ok. If longevity is your main concern, that may or may not be at odds with overall efficiency. Depends on your budget.
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