Wilo-Sub TWU 4 Plug & Pump

Series description


Water-supply unit with submersible-motor pump, control and complete accessories.


Water-supply unit for self-sufficient water supply in the domestic sector

  • Washing machines
  • Garden sprinkling
  • Transferring by pumping and filling
  • Taps for process water

Type key

E.g.Wilo-Sub TWU 4-0405-C-P&P/FC
TWUSubmersible pump
4Diameter of the hydraulic unit in inches ["]
04Rated volume flow [m3/h]
05Number of hydraulic stages
CSeries generation
P&PPlug & Pump system
FC = Sub I package with HiControl 1
DS = Sub II package with pressure switching

Special features/product advantages

  • Easy installation due to preinstalled and pre-wired components
  • Parts that come in contact with fluids are corrosion-free
  • Integrated non-return valve
  • Low-wearing due to floating impellers


  • Multistage submersible-motor pump with radial impellers
  • Integrated non-return valve
  • NEMA coupling
  • Single-phase motor
  • Thermal motor protection
  • Dry-running protection system (only with Wilo-Plug & Pump Sub‐I package)

Technical data

  • Minimum Efficiency Index (MEI) ≥ 0.7
  • Mains connection: 1~230 V, 50 Hz
  • Immersed 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. immersion depth: 27 m
  • Protection class: IP 68
  • Pressure connection: Rp 1¼


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


Submersible-motor pump for vertical or horizontal installation.


Multistage submersible-motor 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 single-phase AC motor for direct starting without soft starter. 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 max. 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

Wilo Plug & Pump Sub‐I package for garden irrigation of private greenery in the domestic sector:

  • Fully mounted
  • 30 m connection cable approved for drinking water (cross-section: 4x1.5 mm2)
  • Switchbox with capacitor, thermal motor protection and On/Off switch
  • Wilo-HiControl 1 (FC); automatic flow monitor and pressure controller with integrated dry-running protection
  • 30 m guy cable
  • Assembly parts: 2x screwed clamp ring connections, R 1¼ to R 1 reducer, 8x cable binders
  • Installation and operating instructions

Wilo Plug & Pump Sub‐II package for self-sufficient water supply in single-family and multi-family houses:

  • Fully mounted
  • 30 m connection cable approved for drinking water (cross-section: 4x1.5 mm2)
  • Switchbox with capacitor, thermal motor protection and On/Off switch
  • Wilo pressure switching 0 – 10 bar, including 18 l diaphragm expansion tank, manometer, shut-off device and pressure switch
  • 30 m guy cable
  • Assembly parts: T-iron, R 1¼ to R 1 reducer, 8x cable binders
  • Installation and operating instructions

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 www.europump.org/efficiencycharts

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)



PDF: Wilo-Sub TWU 4 Plug & Pump


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