Optimized for accurate gas flow measurement

ensuring seamless field swaps for legacy HVAC systems

Thermal Protection: Equipped with an automatic reset thermal overload to protect the windings during extreme ambient temperatures

electromechanical switching component engineered for high-current management in HVAC heating circuits

Professional installation is recommended to calibrate the differential pressure sensing and maintain optimal efficiency in high-demand heating environments

McDonnell & Miller 63-M Low Water Cut Off 30067439-890 Optimized for accurate gas flowThe McDonnell & Miller 63 M (Part Number 143100) is a heavy duty, float operated mechanical low water cut off designed for superior reliability in both hot water and steam boiler applications. Built for contractors who require a dependable safety interface, this unit features a manual reset mechanism and a robust No. 2 dual switch assembly. These switches provide simultaneous low water cut off protection and a dedicated circuit for an electric water