Star S 21FX, 3-Speed Cast Iron Star Series Circulator, 1/12 HP

Application: Heating
Material: Cast Iron
Horse Power: 1/12
Voltage: 115v
Phase: 1
Hertz: 60
Temperature Range (F): 14°-230°F
Max Pressure (PSI): 140 psi
Max Head (Ft): 21
Max Flow (GPM): 19
Connection Type: Flange Rotated 90 Deg
Connection Size: 1-1/2″
Max. Amps: 0.92
Max. RPM: 2700
Type: 3-Speed Pump




Wet rotor circulation pump, with flanged connection. (Flange parallel to shaft). Pre-selectable speeds to adjust the capacity on “S” versions. Cast iron body for hot-water heating systems of all kinds, industrial circulation systems, cold-water systems and air-conditioning systems.


  • 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)
  • 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
  • Fits all Competitor’s Models
  • Powerful Starting Torque
  • Ultra Quiet
  • Reliable Wet Rotor Technology
  • Automatically Vented


  • Pump housing: Grey cast iron (EN-GJL200)
  • Impeller: Engineered Composite (PP – 40% GF)
  • Shaft: Stainless steel (Cr)
  • Bearing: Metal-impregnated carbon