Parallel pumps, efficiency and capacity on two kinds of network.
Least power: 1 pump, 5.33 kW, pump efficiency 75 %.
Full-speed capacity: 1 pump 120 m³/h, 2 pumps 135 m³/h, 3 pumps 138 m³/h. All running pumps share one VFD speed; efficiency peaks at 75 % at each pump's best-efficiency flow.