McDonnell & Miller 64 Boiler Low Water Cut-Off

McDonnell & Miller 64 Boiler Low Water Cut-Off is a heavy-duty safety device that prevents boiler damage by continuously monitoring water level and automatically stopping the burner when levels drop too low. Featuring 1-inch threaded port connections and mechanical actuation, it delivers fast, dependable response across boiler systems.

Designed for residential, commercial, and industrial applications, it handles steam and water media and meets strict safety standards for reliable operation. This unit is rated for 120/240 VAC, with current ratings of 7.4 A at 120 V / 3.7 A at 240 V (full load) and 44.4 A at 120 V / 22.2 A at 240 V (locked rotor); it supports a boiler pressure rating of 50 PSI and is UL, CSA, and FM approved. With these safety approvals, it is built to withstand demanding boiler environments and deliver reliable protection across residential, commercial, or industrial systems.

• Heavy-duty mechanical actuation for precise shut-off
• 1-inch threaded port connections for easy installation and compatibility
• 120/240 VAC operation with wide current ratings to fit your system
• Steam and water media compatibility for versatile boiler applications
• 50 PSI boiler pressure rating ensures safe, reliable performance
• UL, CSA, FM approved for safety and compliance