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Wilo-Flumen OPTI-TR 22 … 40 | Wilo
Your advantages
Wilo-Flumen OPTI-TR

Your advantages

  • Low cleaning work by avoiding deposits during basin draining thanks to installation close to the ground
  • Low clogging rate and reliable operation thanks to optimised hydraulics
  • Low wear thanks to stainless steel investment-cast propellers with minimal cavitation tendency
  • A wide range of possible uses in diverse applications, even at high-interval running times
  • High flexibility thanks to the most diverse installation options and accessories

Recommended services

Series description


Fast running, directly driven submersible mixer, in continuous or intermittent operation.


  • Stormwater retention tanks
  • Pump sump
  • Mixing and buffer basins
  • Special applications


For suspension and homogenisation in commercial areas of:

  • Process sewage
  • Sewage containing faeces
  • Wastewater (with small amounts of sand and gravel)


  • Thermal motor monitoring with bimetallic strip
  • Operation with frequency converter possible



Wilo-Flumen OPTI-TR 30-1.145-4/16Ex S17


Submersible mixer, horizontal


Series: Mixer with standard asynchronous motor


x10 = nominal propeller diameter in mm




Rated propeller speed in rpm


Number of poles


x10 = stator pack length in mm




Propeller code for special propeller (omitted for standard propeller)

Technical data

  • Mains connection: 3~400 V, 50 Hz
  • Fluid temperature: 3 … 40 °C (37 … 104 °F)
  • Submerged operating mode: S1
  • Protection class: IP68
  • Insulation class: H
  • Max. switching frequency: 15/h
  • Max. immersion depth: 20 m (66 ft)


  • Motor housing: 1.4408 (ASTM A 351) or EN-GJL-250 (ASTM A48 Class 35/40B)
  • Seal housing: 1.4408 (ASTM A 351)
  • Seal:
    • On the motor side: SiC/SiC or NBR (nitrile)
    • Fluid side: SiC/SiC
  • Propeller: 1.4408 (ASTM A 351)



2- or 3-bladed propeller made of solid material with a nominal propeller diameter of 200 mm to 400 mm. Clogging-free propeller geometry design made possible by backward-curved incoming flow edge.


Surface-cooled submersible motor in three-phase current design with permanently lubricated und large-size rolling bearings. The motor winding is equipped with temperature monitoring. The motor heat is given off directly to the surrounding fluid via the motor housing. The connection cable is designed for heavy mechanical loads, sealed water pressure-tight against the fluid and is sealed longitudinally watertight. The connection cable has bare cable ends and is 10 m (33 ft) long as standard.


Large-volume sealing chamber with double shaft sealing. The sealing chamber is filled with white oil and absorbs the leakage from the seal on the fluid side. A corrosion- and wear-resistant mechanical seal is used on the fluid side. The seal on the motor side involves either a rotary shaft seal or a mechanical seal.

Scope of delivery

  • Submersible mixer with attached propeller and connection cable
  • Accessories attached, depending on the installation type
  • Installation and operating instructions


  • Thermal motor monitoring as temperature controller and temperature limiter
  • Thermal motor monitoring with PTC sensor
  • Fluid temperatures up to 60 °C (140 °F), depending on the motor type and motor capacity
  • Sealing chamber monitoring
  • Ex-rated in accordance with ATEX, FM and IEC-Ex
  • Ceram coating for housing parts made of grey cast iron


  • Mounting bracket for wall and floor fixation
  • Lowering device
  • Auxiliary lifting device
  • Cable bollard to secure the hoist cable
  • Adjustable stop
  • Additional rope anchoring
  • Fixation sets with anchor bolts

Installation and operating instructions

Wilo-Flumen OPTI-TR 20-1, 22, 28-1, 30-1, 40-1, Wilo-Flumen EXCEL-TRE 20, 30, 40

Article Number 6074709
Edition 2021-10
Number of pages 48
Language en
PDF (17 MB)

Wilo-Flumen OPTI-TR 20-1, 22, 28-1, 30-1, 40-1, Wilo-Flumen EXCEL-TRE 20, 30, 40

Article Number 6074737
Edition 2021-10
Number of pages 88
Language en, zh
PDF (18 MB)

Installation and operating instructions (digital)

Flumen OPTI-TR/EXCEL-TRE 20...40

Language bg, cs, da, de, el, en, es, et, fi, fr, hr, hu, it, lt, lv, mk, nl, no, pl, pt, ro, ru, sk, sl, sr, sv, tr, uk
HTML (22 MB)

General overview

General Overview 2024 - International version

Edition 2024
Number of pages 74
Language en
PDF (33 MB)

Certification booklet

CE-Booklet Wilo-EMU TR(E) / Wilo-Flumen OPTI-TR / Wilo-Flumen EXCEL-TRE / Wilo-Sevio MIX BG / Wilo-Sevio FLOW BG

Article Number 6074694
Edition 2019-02
Number of pages 36
Language language neutral
PDF (3 MB)

Wilo-Flumen OPTI-TR 20-1 ... 40-1, Wilo-Flumen EXCEL-TRE 20 ... 40, Wilo-Flumen OPTI-TR 50-3 ... 120-1, Wilo-Flumen EXCEL-TRE 50-3 ... 90-2, Wilo-EMU TR 50-2 ... 120-1, Wilo-EMU TRE 50-2 ... 90-2, Wilo-EMU TR/TRE 212 ... 326-3

Article Number 6074694
Edition 2023-10
Number of pages 68
Language en
PDF (37 MB)


Wilo-Flumen EXCEL and Wilo-Flumen OPTI

Number of pages 4
Language en
PDF (933 KB)

Biological treatment with efficiency.

Number of pages 20
Language en
PDF (12 MB)

Efficiency for your Treatment Processes

Number of pages 20
Language en
PDF (6 MB)