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Series description

Your advantages

SOLID T impeller

  • Patented SOLID hydraulics for reduction of clogging susceptibility, suitable for untreated sewage
  • High hydraulic efficiency
  • Reduction of vibrations through a flow-optimised impeller geometry for secure operation and long service lives
  • Energy-efficient IE3 motor technology available as an option
  • Ceram coating and special material for protection against abrasion and corrosion

SOLID G impeller

  • SOLID hydraulics for reduction of clogging susceptibility, suitable for untreated sewage
  • Consistently high efficiency due to adjustable suction port
  • Process reliability thanks to optimised impeller geometry for safe pumping of untreated sewage with long-fibre components
  • Energy-efficient IE3 motor technology available as an option

Handle sewage. But preferably with minimal clogging.

Due to the increasing solids content in the sewage, pumps can clog.

This can result in breakdowns and therefore higher service costs.

Wilo’s tailor-made system solution: the Wilo-EMU FA submersible sewage pump.

Equipped with SOLID-G or SOLID-T low-clogging impeller technology, it is especially well-suited for use with

untreated sewage to achieve high efficiency and improved operational reliability.


Submersible sewage pump with and without active cooling system for pumping untreated sewage for continuous duty in the stationary and portable wet well installation, as well as for stationary dry well installation.


Pumping of

  • Untreated sewage with faeces and long-fibre components
  • Sewage containing faeces
  • Process water


  • Submersible motors as surface-cooled motors or self-cooling motors with active cooling system
  • Longitudinally watertight cable inlet
  • SOLID hydraulics with closed (T) or half-open (G) impeller

Scope of delivery

  • Submersible sewage pump
  • Cable length and accessories in accordance with customer requirements
  • Operating and maintenance manual

Type key


Wilo-EMU FA 20.54T + FKT 27.1-4/28KEx-E3


FA 20.54T


Submersible sewage pump


x10 = discharge port nominal diameter, e.g. DN 200


Performance indicator


SOLID impeller

T = closed SOLID impeller

G = semi-open SOLID impeller


FKT 27.1-4/28KEx-E3


Motor type:

T = surface-cooled motor without cooling system

FK, FKT, HC = self-cooling motor with active cooling system




Distinctive number


Number of poles


x10 = package length in mm


Seal version:

H = rotary shaft seal/mechanical seal

G = two separate mechanical seals

K = block seal cartridge with two mechanical seals




High-efficiency motor in accordance with IE3 (derived from ISO 60034-30)

Technical data

  • Mains connection: 3~400 V, 50 Hz
  • Submerged operating mode: S1
  • Non-immersed operating mode: S1 (FK, FKT, HC motor) or S2 (T motor, depending on performance)
  • Protection class: IP68
  • Fluid temperature: 3 - 40 °C, higher temperatures on request
  • Free passage (T impeller): 78x105…150x150 mm
  • Free ball passage (G impeller): 80 or 90 mm
  • Max. immersion depth: 20 m


  • Housing components: EN-GJL or EN-GJS
  • Impeller: EN-GJL or EN-GJS
  • Static gaskets: NBR
  • Sealing on pump side: SiC/SiC
  • Sealing on motor side: NBR, carbon/ceramic or SiC/SiC
  • Shaft: Stainless steel 1.4021, as of size 49: High-grade steel 1.7225


Submersible sewage pump as submersible monobloc unit for stationary and portable wet well and dry well installation. Portable installation is possible, depending on type.


The outlet on the pressure side is designed as horizontal flange connection. The maximum possible dry matter is 8 %. “SOLID” impellers are used as the impeller form:

  • T impeller: closed SOLID impeller for very smooth operation and high efficiencies. The hydraulic units are equipped with an impeller wear ring and casing wear ring. These can be readily replaced and contribute to ensuring the long-term, uniform efficiency of the unit.
  • G impeller: half-open SOLID impeller for high non-susceptibility to clogging and good efficiencies in comparison with conventional vortex impellers. The gap between suction port and impeller can be readjusted later. This ensures uniform hydraulic efficiency.


Submersible motors with passive and active cooling are used for the drive:

  • T motors (surface-cooled motors) have passive cooling. They emit their heat directly into the surrounding fluid via the housing parts. For this reason, these motors can operated immersed in continuous duty (S1), depending on performance, and non-immersed in short-time duty (S2).
  • FK, FKT and HC motors are self-cooling and have an active cooling system. The waste heat is guided via the coolant (white oil or water-glycol mixture) to an integrated heat exchanger, and this releases the waste heat to the conveyed medium. As a result, these motors are suitable for continuous duty (S1) either in immersed or non-immersed state.

All motors have a sealing chamber that protects the motor from fluid ingress. It can be accessed from the outside and can be monitored with an optionally sealing chamber electrode. All filling fluids used are potentially biodegradable and environmentally safe.

In addition, depending on performance, high-efficiency motors with the IE3 efficiency class (in accordance with IEC 60034-30) are also available. These motors are marked with the extension “E3” in the type code.

The cable inlet on the motors is longitudinally watertight, cable lengths can be individually configured.


Fluid-side and motor-side sealing is possible in the following versions depending on the motor type:

  • Version H: Mechanical seal for the fluid side, rotary shaft seal for the motor side
  • Version G: Two independently-acting mechanical seals
  • Version K: Block seal cartridge with two independently acting mechanical seals

Duty chart



REACH regulation

Edition 2020-08
Page format 209.9 x 296.7 mm
Number of pages 4

PDF (1 MB)




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