meaning the circuit completes only when the 24V coil is energized

increasing the maximum operating fluid temperature to 428 degrees Fahrenheit (220°C)

The Rheem-Ruud 70-20602-01 Blower Wheel is a precision-engineered OEM replacement centrifugal fan designed for high-static pressure applications in residential and light commercial HVAC units

this model allows for manual pre-setting of the flow rate to balance the system before the thermostatic head is installed

minimizing pressure drops while maximizing the response time of your boiler control system

McDonnell & Miller PSE-801-U-120 Low Water Cut Off Els PW 29614 meaning the circuit completes onlyMcDonnell & Miller?PSE 801 U 120 120Vac Auto Reset Low Water Cut Off for Steam Boilers with Test Switch and Extended Barrel Probe (Part Number 153828) LWCO 120V (153828)