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McDonnell & Miller’s newly enhanced GuardDog® RB Series brings smaller compact design for high efficiency compatibility and integration.
The updated Low Water Cut Off solutions streamline operations and elevate existing product lines, coincide with the company’s 100th anniversary.

McDonnell & Miller, a Xylem brand, is proud to introduce updates to its electronic Low Water Cut Off (LWCO) product line, including the GuardDog® RB-24SE Low Water Cut-Off and RB-122E Low Water Cut-Off for Hot Water Boilers. Arriving during McDonnell & Miller’s centennial, these product line enhancements signify the company’s legacy as an industry leader committed to reliable engineering and
manufacturing and continuous innovation.

The GuardDog® RB-24SE and RB-122E share a variety of features, including an exclusive, patented McDonnell & Miller self-cleaning probe—the only low water cut-off equipped with one.

Saving time and money, the self-cleaning probe minimizes scale build-up and protects users from potential boiler shutdowns or water overfill, while extending the recommended cleaning interval. The updated LWCO line also features a leak-free metal-to-metal seal and a push-totest button that quickly confirms proper operation, enabling low water cut-off protection to be verified without draining any part of the system.

“Upgrading the LWCO line positions Xylem to further meet growing industry demands and reflects McDonnell & Miller’s 100-year-old commitment to engineering efficient and reliable solutions that strengthen user experience and simplify operations,” said Jarek Berezowski, product manager, steam specialties, Xylem Inc. “In addition to a more accessible experience, the enhanced GuardDog® RB series promotes easy integration due to its reduced size and
backwards compatibility, meaning that new offerings can easily replace current installations in the market.”

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 GuardDog® RB-24SE key features and benefits:
• Universal wiring harness fits most of today’s hot water boilers
• Small compact size that fits high efficiency boilers, optimized design ensures reduced
footprint, making it the ideal choice for space-conscious installations
• 15,000 ohms probe sensitivity
• Exclusive self-cleaning probe
• Designed per UL353/1998 standard
GuardDog® RB-122E key features and benefits:
• Primary cut-off for residential hot water boiler applications
• No blow down required
• 20,000 ohms probe sensitivity
• Designed per UL353/1998 standards
• Exclusive self-cleaning probe

McDonnell & Miller is marking a century of innovation, celebrating 100 years of dependability in the engineering and manufacturing of boiler controls, liquid level controls and flow switches for steam and hot water boilers.

For more information about McDonnell & Miller’s LWCO offerings, product details are available at the following links: GuardDog® RB-24SE, GuardDog® RB-122E.

To place an order, contact your local McDonnell & Miller representative at https://mcdonnellmiller.com/findarep.

To learn more about Xylem’s commitment to future-proofed
solutions in the commercial buildings space, visit https://bellgossett.com/buildingbetter.

About Xylem
Xylem (XYL) is a leading global water technology company committed to solving the world’s critical water challenges with innovation and expertise. Our 23,000 diverse employees delivered combined pro forma revenue of $8.1 billion in 2023. We are creating a more sustainable world by enabling our customers to optimize water and resource management and helping communities in more than 150 countries become water-secure. Join us at www.xylem.com and
Let’s Solve Water.


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