A.O. Smith 9005044205 Aquastat Control Kit W/3/4" Well 3-1/2"X7/16" Bulb

The A.O. Smith 9005044205 Aquastat Control Kit is a temperature controller that is used in HVAC and hydronic heating systems to check and control water temperature. It has a 3/4 inch well and a 3-1/2 inch x 7/16 inch sensing bulb, which is placed in the water circuit of the boiler or heat exchanger. The system uses temperature variations in water to activate or deactivate burners or circulator pumps in the heating system through signals to the control module of the heating system. Having fixed temperature limits prevents overheating and facilitates the regular running of the system.