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Wilo-Vardo WEEDLESS-F | Wilo
Your advantages

Your advantages

  • Optimum agitation in basin with square or rectangular floor plan
  • Operational reliability owing to wear-resistant propeller
  • Easy installation for existing systems
  • Floating version for basins with alternating water levels

Recommended services

Series description


Low-speed vertical mixer with gear motor


The mixers are suitable for both intermittent and continuous duty in wastewater and sewage (with and without faeces) as well as in sludge:

  • For suspension of solid matter
  • For homogenisation


  • Drive unit
  • Variable length of the mixer shaft
  • 2-blade or 3-blade propeller



Technical data


  • Max. circulation capacity: 7.5 m³/s
  • Propeller diameter: 2.50 m ... 1.50 m
  • Diameter of mixer shaft: 70 ... 114 mm
  • Shaft length: from 2 m
  • Fluid temperature: 3 ... 40 °C

Drive unit

  • Mains connection: 3~400 V, 50 Hz/3~460 V, 60 Hz
  • Drive power: 0.37 ... 7.50 kW
  • Operating mode: S1
  • Protection class: IP55, with protective fan cover
  • Insulation class: F (155 °C)
  • Ambient temperature: -20 ... +40 °C


  • Motor housing: EN-AC
  • Gear housing: EN-GJL-200
  • Output shaft: Steel (C 45)
  • Motor plate:
    • Steel, hot-galvanised
    • Stainless steel A2
    • Stainless steel A4
  • Mixer shaft:
    • Steel, coated
    • Stainless steel A2
    • Stainless steel A4
  • Rotary shaft seals: FKM
  • Hub: PUR/A4
  • Propeller blades: PUR


Vertical mixer for permanent installation in basins, on platforms or mounting brackets. Floating version for free placement in the basin.

Drive unit

Mixer-type gear motors with mixer lantern and additional bearing are used as the drive unit. Rated power of 0.37 kW to 7.5 kW in motor efficiency class IE3. High-efficiency IE4 versions are also available as an option. The motors are suitable for continuous duty. The drive unit can also be complemented with different options (e.g. suitability for explosive environments).

Motor plate

The motor plate connects the drive unit to the structure by suitable fixations. The motor plate can be modified to system-specific requirements to do this. A gas-tight version is also available. This version facilitates operation in potentially explosive atmospheres.

Mixer shaft

The mixer shaft made of thick-walled, hollow steel links the drive unit to the propeller unit. Shrink discs and tensioning kits connect the components to the drive and propeller unit.


2-blade or 3-blade solid propeller with a nominal propeller diameter of 2500 mm to 1500 mm. The individual propeller blades are attached to a hub on the mixer shaft. Here, the propeller blade angle can be set to 30, 35, 40 or 45°. The flow direction can be configured towards the water surface or the ground of the basin depending on the design.

Scope of delivery

  • Vertical mixers with motor plate
  • Propeller blades packed individually, installation on-site
  • Operating and maintenance manual

Installation and operating instructions


Article Number 6074816
Edition 2019-02
Page format 209.9 x 297.0 mm
Number of pages 44
PDF (5 MB)

General overview

General Overview 2023 - International version

Edition 2022
Page format 209.9 x 297.0 mm
Number of pages 74
PDF (24 MB)

Certification booklet


Article Number 6090988
Edition 2020-10
Page format 209.9 x 297.0 mm
Number of pages 12
PDF (5 MB)


Biological treatment with efficiency.

Page format 209.9 x 297.0 mm
Number of pages 20
PDF (12 MB)

Certificate REACH

REACH Regulation

Edition 2021-05
Page format 209.9 x 297.0 mm
Number of pages 4
PDF (212 KB)