Wilo Star S 21 ZFX, 115V, 3-Speed Stainless Steel Star Series Circulator


Wilo Star S 21 ZFX, 3-Speed Stainless Steel Star Series Circulator for hydronic radiant floor

Technical sheet User manual

In stock


Part #: 4190427 SKU: WIL-S21-ZFX Categories: ,

Wilo Star S 21 ZFX circulator pump incorporates a stanless housing and a three speed motor (Low/Med/High)  . Wilo Star S 21 ZFX is among the most popular and most versatile circulator pump models on the market. Pump’s performance parameters cover nearly all traditional heating applications – from radiant and baseboards, to fan coils and zoning and many others. 3 speeds allow to set up the circulator pump in a way, that matches the system’s requirements, while wet rotor design allows it to be virtually silent while operating.


  • 115V/60Hz
  • Stainless steel housing
  • 90 degrees rotated fixed flanges
  • Built-in motor protection for longer life and better performance.
  • Suitable for a wide range of applications, including radiant heating, hydronic heating, fan coil heating,
  • solar and other system types.
  • Whisper-quiet operation for sound sensitive installations.
  • Includes (2) Gaskets (O-rings).
  • UL/CSA listed.


  • Closed loop radiant heating & snow melting systems.
  • Baseboard/Radiator/Fan coil heating and other hydronic heating applications.
Weight3,5 kg
Dimensions15 × 19 × 17 cm

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