McDonnell & Miller 369 Boiler Low Water Cut-Off

Boiler Low Water Cut-Off, the McDonnell & Miller 369, delivers reliable boiler protection with a built-in low water cutoff. Designed for both residential and industrial boilers, this mechanical-actuation device ensures safe operation in steam and water systems.

Featuring a 2-1/2 inch threaded port and a compact footprint (9-1/2 inches long by 4-1/8 inches wide), it installs easily into existing boiler setups. The unit supports 120/240 volt AC power, with full-load currents of 7.4 A at 120 V and 3.7 A at 240 V, and locked-rotor ratings of 44.4 A at 120 V / 22.2 A at 240 V, making it compatible with a wide range of residential and commercial circuits.

Key specifications include a 20 PSI steam pressure rating, and the device handles both steam and water media. Insertion length is 1-3/4 inch, and it carries UL, CSA, and FM listings for added safety and reliability.

• Built-In low water cutoff for automatic boiler protection
• Mechanical actuation for reliable operation
• 2-1/2 inch threaded port and 9-1/2" x 4-1/8" footprint
• 120/240 V AC input with listed current ratings
• Suitable for steam and water media, 20 PSI steam rating
• Ideal for residential and industrial applications
• UL, CSA, FM listed
• Insertion length: 1-3/4 inch