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-to- test button that quickly confirms proper operation, enabling low water cut-off protection to be verified without draining any part of the system.
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