Series description


Glandless circulation pump with threaded connection. Preselectable speed stages for power adjustment


Hot-water heating systems of all kinds, industrial circulation systems, cold water systems and air-conditioning systems

Type key

Example:Wilo-Star-RS 25/4
Star-RSStandard pump (screw-end pump)
25/Nominal connection diameter Rp
4Nominal delivery head [m] at Q = 0 m3/ h

Special features/product advantages

  • Suitable for any installation location with a horizontal shaft; terminal box in 3-6-9-12 o'clock position
  • Three preselectable speed stages for load adjustment
  • Easy and safe installation due to practical wrench attachment point on pump body
  • Simplified electrical installation due to terminal box with removable threaded cable connection that can be used on both sides; quick connection with spring clips

Technical data

  • Permissible temperature range -10°C to +110°C
  • Mains connection 1~230 V, 50 Hz
  • Protection class IP 44
  • Threaded connection Rp ½, Rp 1 or Rp 1¼
  • Max. operating pressure 10 bar


Operating modes

  • Speed-stage switching

Manual functions

  • Setting of speed stages (3 speed stages)


  • Wrench attachment point on pump body
  • Cable lead-in possible on both sides
  • Quick connection with spring clips
  • Blocking current-proof motor


  • Pump housing: Grey cast iron
  • Impeller: Plastic
  • Shaft: stainless steel
  • Bearing: Carbon, metal impregnated

Scope of delivery

  • Pump
  • Seals
  • Installation and operating instructions


  • Version ...RG with housing made of red brass
  • Version ... -130 with short overall length of -130 mm


  • Screwed connections
  • Adapter fittings
  • Thermal insulation shells

Duty chart

Pump curves


General overview

Edition 2017
Page format A4
Number of pages 72

PDF (46 MB)


Wilo-Star RS, RSD

Article Number 4185968
Edition 1502
Version number 02
Page format A4
Number of pages 22

PDF (2 MB)



PDF: Wilo-Star-RS


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