Pump selection with KSB – for maximum efficiency, right from the start

The selection of pumps, valves and piping plays a major role in making the operation of your system energy-efficient and cost-saving. In this step, the individual components of the hydraulic system are matched to your requirements and to each other. We find the optimum solution for every application, through consultation and meeting with you.

Find out more about the systematic selection with KSB or go directly to one of our helpful.

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The systematic approach

Selection step-by-step

The best selection result is obtained by following a clearly defined process. All our process steps have been developed and perfectioned through scientific studies, comprehensive expertise and many years of experience. From the analysis report and the selection of individual components right through to an energy-efficient system – we are there for you throughout the entire process. 


Step 1: Determining the system structure

The first step towards an optimum pump selection is to determine the system structure. Based on the load profile and the geodetic head we determine how many pumps should be used and in what operating mode. For a variable load profile, adjusting the head to demand by means of speed control can save 60 % of the energy consumed in mains operation.


Step 2: Selection of pumps, valves and piping


In the second step of pump selection, the components are matched to the system structure: For mains operation, the optimum hydraulic system has its maximum efficiency as close as possible to the actual operating point. To this end, we offer a range of closely spaced pump sizes, and we trim the impeller. For speed control, pump selection depends on the number of pumps and their load profile.


Important for the selection of valves are optimum flow coefficients and correct piping dimensions. KSB’s valves are great at saving, given their excellent zeta values and further product functions.


Dimensioning of the piping is part of the selection of an energy-efficient pump system. Particularly important are the flow velocities, the pipe diameter expansion at the discharge nozzle of the pump as well as the correct material selection. For optimum dimensions a cost-efficient compromise between pipe friction losses and materials used must be found.

Step 3: Selection of motors and automation products

For a proper pump selection, the drive and automation products also play a major role. Our motor concept offers the optimum drive for every system. You can choose the ideal combination of motor and automation product for the specific load profile from our broad product range. Next to meeting your requirements, we naturally take into account the aspects of economic efficiency, resource efficiency and compliance with ErP regulations.

Auswahl von Motoren und Automation

KSB SuPremE® – the energy diet for your system

The KSB SuPremE® IE4* motor is the world's most efficient magnet-less pump motor and the best solution for a variable operating point. This magnet-less synchronous reluctance motor of energy efficiency class IE4* saves you a maximum in energy. It is unbeatably efficient in part load operation and has an outstanding eco-balance. Most importantly, this drive technology does away with magnetic components – while having an energy efficiency that is equal to or higher than that of a permanent magnet synchronous motor (PMSM). Further advantages compared with a PMSM:

  • Higher efficiencies in the part-load range
  • No risk of demagnetisation
  • Lower rotor inertia
  • Lower operating temperature
  • Robust design 

*IE4 in accordance with IEC (CD) 60034-30 Ed. 2

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IE4 asynchronous motor

For a static load profile, we recommend using an asynchronous motor of efficiency class IE4 for maximum energy savings, especially for pumps in continuous operation. The payback period may be longer, but savings will be higher in the long term.

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IE3 asynchronous motor – our standard

If you would like to use a powerful drive technology, a fixed speed asynchronous motor is usually the best solution for a static operating point. As standard, KSB supplies robust, efficient IE3 motors which are suitable for DOL starting and meet the legal requirements.

KSB's own development, the Amarex KRT submersible motors, also meet the requirements of efficiency class IE3.*

**IEC 60034-30 standard not binding for submersible motors. Efficiencies calculated/determined according to the measurement method specified in IEC 60034-2. The marking is used for submersible motors that achieve efficiency levels similar to those of standardised motors to the IEC 60034-30 standard.

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IE2 asynchronous motor

Within the EU, IE2 asynchronous motors with a nominal power exceeding 7.5 kW must be controlled by a frequency inverter. The variable speed version is suitable for variable load profiles, however, it is less energy-efficient and resource-efficient than a synchronous reluctance motor.

Combined with PumpDrive, an IE2 motor is a suitable solution for motor ratings exceeding 45 kW, by-pass options or explosion protection. Outside the EU, an IE 2 motor without frequency inverter can be the most economical solution for a limited period of use. 

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Permanent magnet synchronous drives

A permanent magnet synchronous motor is the ideal drive technology for glandless pumps with a large clearance between rotor and stator.

KSB’s circulator has an integrated variable speed system, so it automatically adjusts the output to the demand. In Eco Mode the operating mode can be adjusted to the load profile even further, which results in top savings. Halving the flow rate can save an additional 40 % in energy compared with proportional-pressure control.

The UMA S synchronous motor is a powerful drive for submersible borehole pumps of the UPA series which excels through its energy efficiency. Owing to its high output per size, UMA-S saves up to 12% in energy and hence costs compared with common asynchronous motors. Since the motor is operated in combination with a frequency inverter, significant additional savings can be achieved thanks to the adjustment of the operating point.


Pump selection software: finding the best solution, fast

The right tool for every situation

To find an optimum solution for your system we offer you three professional consultant software programs for configuring pumps and valves. These tools are based on our experts’ know-how and help you with your individual pump selection.

KSB EasySelect®

KSB EasySelect® is a comprehensive all-round tool for pumps and valves – for all applications.


KSBase Consult Building

The selection software for pumps and valves in building services supports you as a building services consultant with information, curves, calculations and typical tenders.


KSB Helps

KSB Helps is a special pump selection software for waste water pumps. It helps select the right pump and also offers CAD files and typical tenders.


4 criteria for an optimum selection result

The selection outcomes are implementation scenarios and recommendations on how to optimise your hydraulic system. In the context of FluidFuture® the optimum means maximising energy efficiency as well as satisfying the following four criteria:

The application-specific requirements are met.

The solution is energy-efficient.

The ratio of savings to investment costs is ideal.

The (ErP) energy efficiency regulations are complied with.

Your contact to KSB

Thank you for taking an interest in FluidFuture® by KSB. Would you like to find out more? Contact us: it's quick and easy.

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