Wilo-Sub TWI 10


Multistage 10″ 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

Type key

Example: Wilo-Sub TWI 010,125-02-NB + NU 811-2/90
Hydraulics: TWI 010.125-02-NB
TWI Hydraulics
0 Configurable series
10 Diameter of the hydraulic unit in inches [“]
125 Rated volume flow [m3/h]
02 Number of hydraulic stages
N Impeller diameter (N = Standard, S = trimmed)
B Series generation
Motor: NU 811-2/90
NU Submersible motor
811 Size (5…, 6… = 6″; 7…, 8… = 8″)
2 Number of poles
90 Package length

Special features/product advantages

  • Long service life thanks to corrosion-resistant stainless steel, optionally in V4A quality
  • ACS certified for domestic hot 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

Technical data

  • Mains connection: 3~400 V, 50 Hz
  • Immersed operating mode: S1
  • Fluid temperature:
    • Hermetically cast motors: 3-20 °C or 3-30 °C (depending on type)
    • Rewindable motors: 3-30 °C (depending on type)
  • Minimum motor flow: 0.1-0.5 m/s (depending on type)
  • Max. sand content: 50 g/m3
  • Max. number of starts: 10‐20/h (depending on type)
  • Max. immersion depth: 100 – 350 m (depending on type)
  • Protection class: IP 68
  • Pressure connection: Rp 6


  • Multistage submersible-motor pump with semi-axial impellers
  • Integrated non-return valve, spring-mounted
  • NEMA coupling up to 8″ motor connection, standardised connection for 10″ motor and larger
  • Three-phase motor
  • Hermetically cast motors
  • Rewindable motors
Wilo-Sub TWI 10 graph


  • Hydraulic housing: Stainless steel 1.4301
  • Impellers: Stainless steel 1.4301
  • Hydraulics shaft: Stainless steel 1.4057
  • Motor housing: EN‐GJL or stainless steel 1.4301
  • Motor shaft: Stainless steel 1.4542 or 1.4462 (depending on type)


Submersible pump with ACS approval for vertical or horizontal installation.


Multistage submersible-motor pump with 6/8″-NEMA- or from 10″ and larger with standardised connection and semi-axial impellers in sectional construction. Integrated non-return valve. All parts that come in contact with the fluid are made of corrosion-free materials.


Three-phase motor for direct or star-delta start. Sealed, hermetically cast motor, resin-impregnated, with enamel-insulated winding or rewindable motor with PVC-insulated winding, self-lubricating bearing, with water-glycol filling. Motors of the NU 611, NU 8…, NU 9… series are also available in drinking water version (T version).


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.


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

Scope of delivery

  • Hydraulics + motor fully assembled
  • Connecting cable approved for drinking water, cable cross-section and length per standard design or per customer request
  • Installation and operating instructions


  • Hydraulics in 1.4401 stainless steel
  • Motor in stainless steel 1.4401, 1.4571 or G-CuSn10
  • 60 Hz version
  • Star/delta starting
  • Rewindable motor
  • Rewindable motor with drinking water filling as special version