Catalogue creation
My favorites
Product comparison
Wilo-Sub TWI 4 | Wilo

Wilo-Sub TWI 4

The reliable and corrosion-resistant multistage 4″ submersible pump.

Your advantages
Wilo-TWI 4

The reliable and corrosion-resistant multistage 4″ submersible pump.

Recommended services

Your advantages

  • Long service life thanks to corrosion-resistant stainless steel, optionally in V4A quality
  • ACS certified for drinking water applications
  • A high degree of flexibility thanks to versions in the 4, 6, 8 and 10-inch area
  • High range of performance from 1 to 250 m³/h
Series description
Sub TWI 4, (3~400 V)


Multistage 4" submersible pump in tie strap version for vertical or horizontal installation


  • For water and drinking water supply from boreholes and rainwater storage
  • Process water supply
  • For municipal water supply, sprinkling and irrigation
  • Pressure boosting
  • Lowering the water level
  • For pumping water in industrial applications
  • For pumping water without long-fibre and abrasive constituents


  • Multistage submersible-motor pump with radial impellers
  • Integrated non-return valve
  • NEMA coupling
  • Single-phase or three-phase motor
  • Hermetically cast motors



Wilo-Sub TWI 4.01-09-C


Submersible pump


Diameter of the hydraulic unit in inches ["]


Rated volume flow [m3/h]


Number of hydraulic stages


Series generation

Technical data

  • Mains connection: 1~230 V, 50 Hz or 3~400 V, 50 Hz
  • Submerged operating mode: S1
  • Fluid temperature: 3 – 30 °C
  • Minimum flow rate at motor: 0.1 m/s
  • Max. sand content: 50 g/m3
  • Max. number of starts: 20/h
  • Max. immersion depth: 150 m
  • Protection class: IP68
  • Pressure connection: Rp 1¼ – Rp 2


  • Hydraulic housing: 1.4301 stainless steel
  • Impellers: 1.4301 stainless steel
  • Hydraulics shaft: 1.4057 stainless steel
  • Motor housing: 1.4301 stainless steel
  • Motor shaft: 1.4305 stainless steel


Submersible pump with ACS approval for vertical or horizontal installation.


Multistage submersible-motor pump with 4" NEMA connection and radial or semi-axial impellers with sectional construction. Integrated non-return valve. All parts that come in contact with the fluid are made of corrosion-free materials.


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


The motor is cooled by the pumped fluid. The motor must always be immersed when operated. The limit values for maximum fluid temperature and minimum flow velocity must be adhered to. Vertical installation is possible with or without cooling jacket. Horizontal installation must be performed in conjunction with a cooling jacket.

Pressure shroud

The pressure shroud is used for the direct installation of the unit in the pipe network. Standard models are without mounted non-return valves. The maximum inlet pressure is 10 bar.

Scope of delivery

  • Hydraulics + motor fully assembled
  • 1.5/2.5 m connecting cable approved for drinking water (cross-section: 4x1.5 mm2)
  • Single-phase version including switchbox with capacitor, thermal motor protection and On/Off switch
  • Installation and operating instructions


  • Hydraulics in stainless steel 1.4401
  • Motor in stainless steel 1.4401
  • 60 Hz version


  • Cooling jacket pipes
  • Pressure shroud (for configured units)
  • Diaphragm pressure vessel
  • Cable kits for drinking water and process water
  • Switchgears

Installation and operating instructions

Wilo-Sub TWI 4..., TWI 4-...-QC

Article Number 6061724
Edition 1110
Number of pages 344
Language da, en, et, fi, lv, mk, no, pt, sl, sr
PDF (2 MB)

Wilo-Sub TWI 4..., TWI 4-...-QC

Article Number 6061724
Edition 1110
Number of pages 28
Language en
PDF (516 KB)

Certification booklet

Wilo-Sub TWI 4, Wilo-Sub TWI 6/TWI 06, Wilo-Sub TWI 8/TWI 08, Wilo-Sub TWI 010

Article Number 6080451
Edition 2022-02
Number of pages 24
Language language neutral
PDF (4 MB)


Wilo-Sub TWI

Article Number 6080451
Edition 1612
Number of pages 14
Language language neutral
PDF (388 KB)
Product selection
Number of results: 97
0.37 … 7.5 kW