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ECM pump recommendation

Finishing an Uponor-designed radiant heat system. Boiler is a Navien NCB-180E. Primary loop will use Navien's built-in pump. Secondary loop will have a single pump and I was wondering if someone could recommend a proper ECM pump for this application?

Following are more details and calculations from the Uponor design:
  • Secondary loop separated by a 20 gallon buffer tank (HTP SSU-20B)
  • Total RH Circuits: 16
  • Total Manifolds: 3
  • Total Zones: 7
  • Smallest zone Head Loss: 0.9
  • Total system Head Loss: 7.0
  • Total Flow: 5.31
  • Water Temp: 92.2
  • Total Heating Load: 25,374 Btu/hr (Radiant Back Losses: 5,049 Btu/hr; Radiant Heating: 19,964 Btu/hr)
  • First floor has in-slab tubing; second floor has heat transfer plates mounted to the sub-floor from below

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