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Wilo Star S21 RFC 4171560 3-Speed 1/12 HP Pump Circulator

SKU 4171560
by Wilo
Original price $249.00 - Original price $249.00
Original price
$249.00 - $249.00
Current price $249.00
in stock

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.


  • Cast iron housing, rotating flanges, three-speed motor (Low/Med/High), and a built-in, removable check valve - Max head: 21 feet
  • Built-in motor protection for longer life and better performance. - 24/30 months warranty on material/workmanship
  • Suitable for a wide range of applications, including water and glycol radiant floor heating, hydronic heating, fan coil heating, solar water heating, etc...
  • Whisper-quiet operation for sound-sensitive installations
  • Includes (2) Gaskets (O-rings) / UL/CSA listed - Made in France.

Application: 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. 

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              Type3-Speed Pump
              MaterialCast Iron
              Horse Power1/12HP
              Permitted Temperature Range+14 °F to +230 °F (‐10 °C to +110 °C)
              Power Supply1~115 V, 60 Hz
              Protection ClassF
              Optional Flange Sizes Flange Sizes¾", 1", 1 ¼" and 1 ½" NPT
              Max. Operating Pressure145 PSI (10 bar)
              Max Flow Rate18 USGPM
              Max Head33 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
              Head Range (ft.) 
              Temperature Range (F) 
              Connection Size 
              Connection Type 

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