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Wilo-Sub TWU 4-...-GT | Wilo
Your advantages
Wilo-Sub TWU 4 GT

Your advantages

  • Low operating costs due to optimised hydraulics and efficient motors for targeted use in geothermal applications
  • High annual performance factor (JAZ) through increased system effectiveness
  • High operational reliability thanks to floating impellers and integrated non-return valve
  • Easy installation via Quick Connect variant for quick and easy extension of the motor cable

Recommended services

Series description


Multistage 4" submersible pump in shroud design for vertical and horizontal installation


  • Geothermal applications
  • For water supply from boreholes and rainwater storage tanks
  • For domestic water supply, sprinkling and irrigation
  • Pressure boosting
  • Lowering the water level
  • For pumping water without long-fibre and abrasive constituents


  • Multi-stage submersible pump with radial or semi-axial impellers
  • Hermetically cast motors
  • Integrated non-return valve
  • NEMA coupling
  • Three-phase motor



Wilo-Sub TWU 4-0203-C-QC-GT


Submersible pump


Diameter of the hydraulic unit in inches ["]


Rated volume flow [m3/h]


Number of hydraulic stages


Series generation


Motor shroud in 1.4571, motor connection via flat male tab


Quick Connect CableQuick connect cable for simple and fastextension of the motor cable


for geothermal applications

Technical data

  • Mains connection: 3~400 V, 50 Hz,
  • Submerged operating mode: S1
  • Fluid temperature: 3-30 °C
  • Minimum flow rate at motor: 0.08 m/s
  • Max. sand content: 50 g/m3
  • Max. number of starts: 20/h
  • Max. submersion depth: 200 m
  • Protection class: IP 68
  • Pressure connection: Rp 1¼


  • Hydraulic housing: Stainless steel 1.4301
  • Impellers: Noryl
  • Hydraulics shaft: Stainless steel 1.4104
  • Motor housing: Stainless steel 1.4301
  • Motor shaft: Stainless steel 1.4305


Submersible pump for vertical or horizontal installation.


Multi-stage submersible pump with radial or semi-axial impellers in sectional construction. Integrated non-return valve. All parts in contact with the fluid are made of corrosion-free materials.


Corrosion-free three-phase motor for direct starting. Sealed and hermetically cast motor with enamel-insulated winding, resin-impregnated, self-lubricating bearing, with water-glycol filling.


The motor is cooled by the fluid. The motor must always be operated in submerged state. The limit values for the maximum fluid temperature and the minimum flow rate must not be exceeded. Vertical installation is possible optionally with or without cooling jacket. Cooling jacket is required for horizontal installation.

Scope of delivery

  • Hydraulics and motor ready assembled
  • Connection cable with drinking water approval (TWU 4-…-GT with 15 m cable; TWU 4-…-GT-QC with short cable and plug for rapid replacement)
  • Installation and operating instructions


  • Motor versions for special voltages 3~380 V, 60 Hz; 3~460 V, 60 Hz


  • Cooling jacket pipes
  • Diaphragm pressure vessel
  • Cable kits for potable and process water
  • Float switch
  • Switchgears
  • Connection and installation material

Installation and operating instructions

Wilo-Sub TWU ..., TWU 4-...-QC, TWU 4-...-P&P

Article Number 2019023
Edition 1103
Page format A4
Number of pages 384
PDF (2 MB)

Wilo-Sub TWU ..., TWU 4-...-QC, TWU 4-...-P&P

Article Number 2019023
Edition 1103
Page format A4
Number of pages 30
PDF (565 KB)

General overview

General Overview 2023 - International version

Edition 2022
Page format 209.9 x 297.0 mm
Number of pages 74
PDF (24 MB)

Certification booklet

Wilo-Sub TWU 4

Article Number 6080453
Edition 1701
Page format A4
Number of pages 8
PDF (510 KB)

Wilo-EMU D/DCH/K/KM/SCH (w/o motor), Wilo-Sub TWI/TWU (w/o motor), Wilo-Actun ZETOS-K8 (w/o motor), Wilo-Actun ZETOS-K10 (w/o motor)

Article Number 6080455
Edition 2021-06
Page format 209.9 x 297.0 mm
Number of pages 72
PDF (7 MB)

Certificate REACH

REACH Regulation

Edition 2021-05
Page format 209.9 x 297.0 mm
Number of pages 4
PDF (262 KB)