TACO VR-1816 Viridian Variable Speed ECM HE Circulator #5800023

The Viridian VR1816 circulator is an infinitely variable speed, high-efficiency wet rotor circulator with an ECM permanent magnet motor. Operating modes include infinitely variable fixed speed and self-adjusting constant pressure or proportional pressure variable speed.


  • Connection type: Flanged
  • Flange Code: S
  • High-efficiency ECM motor uses up to 85% less electricity
  • Infinitely variable speed settings to fine tune flow for any system
  • Six pressure presets to fit the job
  • Sure Start automatic unblocking and air purging mode


  • 18ft. Shut-off head, 16 gpm max flow
  • ECM High-efficiency motor
  • Easy to use dial to set operating speed or pressure control
  • 3 operating modes:
    • Fixed speed - infinitely adjustable min/max settings
    • Constant pressure - variable speed - 3 constant pressure differential curves (5, 10, or 15 feet of head)
    • Proportional pressure - variable speed - 3 variable pressure differential curves (High, Med, or Low)
  • Multi-color LED display showing operating mode and error code diagnostics.
  • Use with a Taco ZVC Zone Valve Control or SR Switching Relay for ON/OFF operation.
  • Integral Flow Check (IFC) is included in carton. Simply press into discharge flange if required.
  • Dual electrical knockouts
  • Whisper quiet operation.
  • BIO Barrier® protects the pump from system contaminants