Bell & Gossett AQS-1/2 and AQS-3/4 Aquastat

Overview Specifications Documentation & Tools Submittals


Aquastat is designed to thermostatically control Bell & Gossett NRF, NBF or Series PL circulators. Separate models are available for 1/2” or 3/4” copper pipe.

Product Features
  • Provides thermostat control circulators
  • Connects to the lead wires in the connection box of any Bell & Gossett NBF/NRF/SSF circulator
  • AQS-1/2 clips onto 1/2″ copper pipe or 3/8″ steel pipe (OD of pipe 5/8″)
  • AQS-3/4 clips onto 3/4″ copper pipe or 1/2″ steel pipe (OD of pipe 7/8″)
  • UL approved

Automatic Timer Kit and Aquastat Combination – To increase the overall efficiency of a hot water recirculation system, the TC-1 timer control kit and the AQS-1 /2” and AQS-3 /4” Aquastat Kits can be used in combination. When used together, the pump will only circulate water when the ON time conditions are met and when water temperature is low enough to cause the Aquastat to switch ON.



Compatible with Bell & Gossett Circulator Models (NRF/NBF/Series PL), indoor use only.

Documentation & Tools