Wilo-Sub TWU 3 HS

Series description


Multistage, frequency controlled 3" submersible pump in jacketed construction for vertical or horizontal installation


  • For private water supply from boreholes, wells and rainwater storage tanks
  • For domestic water supply, sprinkling and irrigation
  • For pumping water without long-fibre and abrasive constituents

Type key

e.g.Wilo sub TWU 3-0305-HS-E-CP
TWUSubmersible pump
3Diameter of the hydraulic unit in inches ["]
03Nominal volume flow [m3/h]
05Number of hydraulic stages
HSHigh-speed version
EFrequency converter version
E = external frequency converter
I = internal frequency converter
CPControl function
CP = constant pressure control
without = fixed speed with up to 8400 rpm

Special features/product advantages

  • Constant, adjustable pressure thanks to external frequency converter with integrated control (TWU 3 HS-ECP)
  • Easy installation with no additional sensors provided by the customer for pressure control (TWU 3 HS-ECP)
  • High output thanks to integrated frequency converters with fixed motor speed of 8,400 rpm (TWU 3 HS-I)
  • Reduction of well bore expansion and installation costs due to narrower diameter and installation volume
  • Comprehensive monitoring and protection functions for absolute operational reliability

Technical data

Submersible pump:

  • Supply voltage:
    HS-E…: 1~230 V, 50/60 Hz (connection to the AC mains supply by a frequency converter )
    HS-I…: 1~230 V, 50/60 Hz (direct connection to the AC mains supply)
  • Submerged operating mode: S1
  • Fluid temperature: 3 – 35 °C
  • Minimum flow rate at motor: 0.08 m/s
  • Max. sand content: 50 g/m3
  • Max. number of starts: 30/h
  • Max. immersion depth: 150 m
  • Protection class: IP58
  • Pressure connection: Rp 1/Rp !¼

Frequency converter for version “HS-E…”:

  • Mains connection: 1~230 V, 50/60 Hz
  • Output: 3~230 V/max. 140 Hz/max. 2.2 kW
  • Fluid temperature: 3 – 50 °C
  • Max. pressure: 8 bar
  • Protection class: IPX5
  • Connection: G 1¼


  • Multistage submersible-motor pump with radial impellers
  • Integrated non-return valve
  • Including frequency converter (HS-E…: external, HS-I…: built-in)
  • Thermal motor protection built into the frequency converter


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


Submersible pump for vertical or horizontal installation.


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


Corrosion-free asynchronous motor for connection to the frequency converter supplied (HS-E…) or for direct connection to the mains power supply (HS-I…). Rewindable oil-filled motor with self-lubricating bearings, designed for high speeds up to 8400 rpm.

Frequency converter

External frequency converter or frequency converter integrated within the motor, for operation of the pump at speeds up to 8400 rpm, including the following functions:

  • Soft starter
  • Undervoltage, overvoltage and short-circuit protection
  • Thermal overload protection of the motor and the frequency converter

The version "HS-E…“ with external frequency converter offers the following additional equipment features:

  • Control function "CP“: Constant pressure
  • Avoidance of frequent switching (cycling) by leakage monitoring
  • Dry-running protection with automatic reset
  • Change of direction of rotation
  • Setting for max. flow and set pressure
  • Pressure is shown on the display
  • Settings, operating statuses and error messages are shown by LEDs or on the display.

The frequency converter always must be installed outside the fluid where it will be protected against overflows!

Control function "CP“: Constant pressure

Operation with the frequency converter means the rotation speed of the unit is adapted to the current water requirements automatically. As a result, the submersible pump always delivers a constant pressure.


The motor is cooled by the fluid. The motor must always be operated in submerged state. The limit values for the max. fluid temperature and the minimum flow rate must not be exceeded.

In cases of vertical installation, a cooling jacket must be provided depending on the diameter of the bore. In cases of horizontal installation, a cooling jacket must always be provided .

The external frequency converter is also cooled by the fluid. For this the frequency converter must be installed directly in the piping outside the fluid (overflow-proof).


  • No suction mode is possible with these units!
  • The unit must be fully immersed in water during operation.
  • An adapter of Rp 1 to G 1¼ in required for installation of all types except TWU 3-05..HS-ECP-B. This must be provided on site!

Scope of delivery

  • Hydraulics + motor ready assembled
  • Frequency converter
  • 1.75 m connecting cable approved for drinking water (cross-section: 4x1.5 mm2)
  • Installation and operating instructions


  • Special cable lengths on request

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 3

Article Number 6080452
Edition 1608
Version number 01
Page format A4
Number of pages 11

PDF (514 kB)


General overview

Edition 2017
Page format A4
Number of pages 72

PDF (46 MB)


Wilo-Sub TWU 3-...HS

Article Number 6063546
Edition 1405
Version number 01
Page format A4
Number of pages 27

PDF (9 MB)



PDF: Wilo-Sub TWU 3 HS


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