^{*The basis for the comparison is the determination of the pump characteristics. The pumps are connected to our pump measuring section and supplied with the required voltage. After a short run-in period, a series of operating points are automatically approached, whereby pressure, flow rate, power consumption and other electrical values are recorded. This is then used to determine the efficiency, for example. These points are then used to create the pump characteristic curve, as well as the characteristic curve for performance and efficiency. The energy consumption of the different pumps for a standardized water volume X at the 2 m operating point is compared here.}