The Outdoor Reset Circulator controls the hot water supply temperature, so that the heat supplied to the building equals the heat loss of the building. The 00-VR modulates the circulator to inject hot water from the boiler loop into the radiant or reduced temperature loop while providing Outdoor Reset to a heating system. Available in any style 003 – 0014, the 00-VR also comes with a boiler sensor to protect against low return temperatures. The 00-VR is the ultimate for protection, control, ease of installation, and trouble-free operation.


  • Adjustable Heating Curve (0.2 to 2.2)
  • Selectable Maximum Supply Temperature (110°F, 130°F, 150°F, or Off)
  • Selectable Minimum Boiler Return Temperature (120°F, 135°F or Off)
  • Minimum Supply Temperature (85°F or Off – Default to Heating Curve)
  • System and/or Boiler Pump Contact (Line Voltage, 5 amp max.)
  • LED Status Panel
  • Pump Exercise (10 Seconds After 3 Days of No Operation)
  • Post Purge (20 Seconds)
  • Fail Safe Mode (Assumes Outdoor Temp of 32°F)
  • 2-Second Start Delay Prevents Short Cycling