Immersible Pump GRUNDFOS MTH


Compact, vertical, multistage centrifugal pump for tank top mounting.

Water Pump Product Information (MEI)

Minimum efficiency index (MEI) means the dimensisonless scale unit for hydraulic pump efficiency at best efficiency point (BEP), part load (PL) and overload (OL). The commision Regulation (EU) sets efficiency requirement to MEI > 0.1 as from 1 January 2013 and MEI > 04 as from 1 January 2015. An indicative benchmark for best performing water pump available on the market as from 1 January 2013 is determined in the regulation.

  • The benchmark for most efficient water pump is MEI ≥ 0.70
  • The efficiency of a pump with a trimmed impeller is usually lower than that a pump with the full impeller diameter. The trimming of the impeller will adapt the pump to a fixed duty point, leading to reduced energy consumption. The minimum efficiency index (MEI) is based on the full impeller diameter.
  • The operation of this water pump with variable duty points may be more efficient and economic when controlled, for example, by the use of a variable speed drive that matches the pump duty to the system.
  • Information on benchmark efficiency is available at
  • The “Year of manufacture” is indicated on the product name plate with a four digit number which as deconded as follows, YYWW with year (2 digits), e.g. PC 0223 for year 2002 and week 23. The number can be seperate or it can be part of the model number, e.g. xxxxPX0223xxxx.

Pump Designs

Immersible Designs

Technical Data

Head max : 99.5 m
Max flow : 22 m3/h

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