McDonnell & Miller

A leader in engineering and manufacturing boiler and liquid level controls, low-water cutoffs, and flow switches for steam and hot water boilers in industrial, commercial and building applications.

Boiler Controls

McDonnell & Miller Low Water cut-offs are specially designed to protect steam and hot water boilers from the hazards of a low water condition. In operation they will interrupt the electrical current to the firing device, if the water in the system drops below the boiler manufacturer’s minimum safe water level. Our low water cut-offs also provide an additional circuit for a low water alarm, should you desire to install one, for additional protection.

MM-Flow-Switch_FS5_600

Flow Switches

mcdonnell miller liquid-level

Liquid Level Controls

MM-Test-N-Check-Valves-TC4_600

Valves

MM-Water-Feeder-Lower-Water-Cut-off-Model-47-2

Water Feeders