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Wilo-Sub TWU 4-...-GT

Series description


Multistage 4" submersible pump in jacketed construction 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

Type key

E.g.Wilo-Sub TWU 4-0203-C-QC-GT
TWUSubmersible pump
4Diameter of the hydraulic unit in inches ["]
02Rated volume flow [m3/h]
03Number of hydraulic stages
CSeries generation
IMotor shroud in 1.4571, motor connection via flat male tab
QCQuick Connect Cable
Quick connect cable for simple and fast
extension of the motor cable
GTfor geothermal applications

Special features/product 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


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

Technical data

  • Minimum Efficiency Index (MEI) ≥ 0.7
  • 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.


  • No suction mode is possible with these units!
  • The unit must be fully immersed in water during operation.

Scope of delivery

  • Hydraulics and motor ready assembled
  • Connection cable with potable 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

General notes - ErP (ecological design-) directive

The benchmark for most efficient water pumps is MEI ≥ 0.70The efficiency of a pump with a trimmed impeller is usually lower than that of 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

Duty chart

Duty chart



NEMA connection

Standardised connection


Integrated non-return valve

Without non-return valve


AC motor


Three-phase motor

Direct activation

Star-delta activation


FC operation

Motor with cast stator

Rewindable motor


Oil motor filling


Water-glycol motor filling

Drinking water motor filling


Hydraulics/motor preassembled


Horizontal installation

Vertical installation


Motor temperature monitoring, PT100


PTC motor temperature monitoring


Capacitor box for 1~230 V

Dry-running protection


Integrated lightning protection



Bearing brackets for horizontal installation


Cooling jacket


Non-return valve


Pressure shroud



Pump housing

Stainless steel

Pump housing (special version)



Impeller (special version)

Motor housing

Stainless steel

Motor housing (special version)


Certification Booklet Wilo-Sub TWU 4

Article Number 6080453
Edition 1701
Version number 02
Page format A4
Number of pages 8

PDF (522 kB)


General overview

Edition 2017
Page format A4
Number of pages 72

PDF (46 MB)


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

Article Number 2019023
Edition 1103
Version number 03
Page format A4
Number of pages 30

PDF (578 kB)



Tipps & Guides

General Overview 2018

PDF: Wilo-Sub TWU 4-...-GT


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