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We are a leader in engineering and manufacturing of boiler controls, liquid level controls and flow switches for steam and hot water boilers.

Our extensive line of products includes:
Low Water Cut-offs, Combination Low Water Cut-offs/Pump Controllers, Water Feeders, Valves, Liquid Level Controls, Liquid Flow Switches and Air Flow Switches.

Find out more:
MM-825(A) Download McDonnell & Miller General Catalog MM-825(A)
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the McDonnell & Miller
Little Red Schoolhouse Video Library.
These presentation are intended to assist you in the proper design of hydronic and steam systems.
New Products   Featured Products  
New Series 1575 Commercial Conductance Probe Low Water Cut-Offs & Pump Controllers provide protection against a low water condition and satisfy pump control needs for commercial and industrial steam boilers. NEMA 4 x chamber with vertical probes is rated to 250 psi.
Typical application:
Primary low water fuel cut-off protection and pump control for commercial and industrial steam boilers
Motorized valve controller, low water cut-off, high water cut-off and alarm actuator for boilers, vessels and tanks
Learn more about this product.
McDonnell & Miller is pleased to bring 21st Century technology to residential steam boilers via the all new PSE-800 low water cut-off.
Microprocessor enables accurate detection of a low water condition without the need to arbitrarily shut down the boiler
Self-cleaning probe minimizes maintenance requirements
Ideally suited to residential steam boilers with unstable water lines
Learn more about this product.
 

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