Hot Water Recirc Pump Head

Pump head from pipe length, fittings, target flow.

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Formula and source

Recirc head = friction loss along the recirc loop at design flow + minor-loss allowance for fittings. Sized for the longest closed-loop circuit per ASHRAE Handbook hot-water recirculation guidance.

ASHRAE Handbook (HVAC Applications) by name; Hazen-Williams (AWWA M11 5th ed.) for friction.

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