McDonnell & Miller 67G Boiler Low Water Cut-Off

The McDonnell & Miller 67G Boiler Low Water Cut-Off is a critical safety device for steam boilers. This float-type low water cutoff protects residential and commercial boiler systems by preventing dangerous low-water conditions that can damage equipment or trigger unexpected shutdowns.

Designed with lever/mechanical actuation, it offers versatile port connections and reliable operation across standard piping. The unit handles steam and water media and is suitable for millivolt service applications, making it a robust choice for both home and business boiler setups.

Key specifications

• Port connections: 1/4 inch, 3/8 inch, and 3/4 inch threaded ports
• Current rating: 7.4 A at 120 V AC / 3.7 A at 240 V AC (full load); 44.4 A at 120 V AC / 22.2 A at 240 V AC (locked rotor)
• Input supply rating: 120/240 V AC, 125 VA
• Pressure rating: 20 PSI (Steam)
• Media: Steam and Water
• Application: Millivolt service, Residential, Commercial
• Standards: UL, CSA, FM listed