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A Century of Innovation with McDonnell & Miller
This year marks 100 years of McDonnell & Miller as a leader in engineering and manufacturing safety devices for steam and hot water boilers.
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GuardDog® RB-24SE Low Water Cut Off
Introducing the GuardDog® RB-24SE, which packs a whole lot of control into a compact device, making it ideal for tight spaces.
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GuardDog® RB-122-E Low Water Cut Off
Introducing the GuardDog® RB-122E, a sturdy, reliable primary cut-off device for residential and commercial hot water boilers.
A Century of Innovation
For 100 years, McDonnell & Miller has been committed to delivering quality through its comprehensive portfolio of safety devices, including its proprietary low water cutoff solutions, which contribute to improved efficiency, reduced energy consumption, lower operational costs and better emissions control.