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Wilo Star S 21 RFC 3-Speed Pump Circulator 1/12 HP

$139.99  CAD  $119.99  CAD
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Wilo Star S "21RFC" 3-Speed Pump Circulator 1/12 HP

The Wilo Star S series Residential circulation pumps offer high quality pumps at affordable prices. Equipped with a rotating flange for easier installations.  The S 21 RFC has a maximum flow of 18 US Gallons Per Minute.


Wet rotor circulation pump, with flanged connections. Pre‐selectable speeds to adjust the capacity on "S" versions. The cast iron body allows  for the circulation of hot water or cold water. 


Cast iron body for hot‐water heating systems of all kinds, industrial circulation systems, geothermal systems, in-floor heating, cold‐water systems and air‐conditioning systems. Wilo pumps are commonly used in outdoor wood burning stoves and indoor wood burning stove systems allowing you to heat more of your buildings. 

Special features / product benefits

  • Suitable for any installation position with horizontal shaft; terminal box in 3‐6‐9‐12 o'clock position
  • Three pre‐selectable speed stages for load adjustment ("S" type only)
  • Rotating 360 degree flange
  • Contains installable check valve


Technical data

  • 1/12HP
  • Permitted temperature range +14 °F to +230 °F (‐10 °C to +110 °C)
  • Power supply 1~115 V, 60 Hz
  • Protection class F
  • Optional Flange Sizes flange sizes ¾", 1", 1 ¼" and 1 ½" NPT
  • Max. operating pressure 145 PSI (10 bar)
  • Max Flow of 18 USGPM
  • Max Head of 33 Feet



  •  Suitable for any installation position with horizontal shaft; terminal box in 3-6-9-12 o'clock position
  • 360 Degree rotatable flange
  • Three pre-selectable speed stages for load adjustment
  • Impedance protected motor, motor protection not required
  • Cable entry both sides of terminal box
  • Quick connection spring clips for simple electrical connection
  • Steel Terminal Box
  • Powerful Starting Torque
  • Wet Rotor Technology
  • Ultra Quiet
  • Automatically Vented


Material Composition:

  • Pump housing: Grey cast iron (EN-GJL200)
  • Impeller: Engineered Composite (PP - 40% GF)
  • Shaft: Stainless steel (Cr)
  • Bearing: Metal-impregnated carbon your wilo Ontario Canadian dealer and retailer


Flange Kit Sold Seperately


Product Documentation Download Documention

Submittal Data Sheet Download Documention

  • Model: WS21RFC

This product was added to our catalog on Friday 05 February, 2016.

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