Data from http://productfinder.wilo.com/en/COM/product/00000018000028040002003a/fc_product_datasheet
The nominal rpm is arbitrarily chosen as the rpm of the pump curve in the data sheet that has the highest rpm, without being limited by the maximum power limitation (see dotted curve on figure below). Pump curves (H(m_flow) and P(m_flow)) from the data sheets are digitized using web plot digitizer.
The figure below illustrates a digitized pump curve.
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