PDF: Wilo-Sub TWI 6


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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


Multistage 6" submersible pump in tie strap version for vertical or horizontal installation


  • For water and drinking water supply from boreholes and rainwater storage tanks
  • 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

Technical data

  • Minimum Efficiency Index (MEI) ≥ 0.4
  • Mains connection: 3~400 V, 50 Hz
  • Submerged operating mode: S1
  • Fluid temperature: 3‐30 °C
  • Minimum flow rate at motor:
    • Hermetically cast motors: 0.08 - 0.16 m/s
    • Rewindable motors (SD-R): 0.1 ‐ 0.5 m/s (depending on type)
  • Max. sand content: 50 g/m3
  • Max. number of starts: 20/h
  • Max. submersion depth:
    • Hermetically cast motors: 350 m
    • Rewindable motors: 100 m
  • Protection class: IP 68
  • Pressure connection: Rp 2½ ‐ Rp 3

Type key


Wilo-Sub TWI 6.18-04-C-SD
TWISubmersible pump
6Diameter of the hydraulic unit in inches ["]
18Rated volume flow [m3/h]
04Number of hydraulic stages
CSeries generation
IMotor shroud in 1.4571, motor connection via flat male tab
SDStarting mode
Without = Direct starting
SD = star-delta starting

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