Xylem GuardDog Electronic Low Water Cut-Off for Hot Water Boilers

The Xylem GuardDog Electronic Low Water Cut-Off (LWCO) from McDonnell & Miller helps protect hot water boilers from unsafe water loss. The control interrupts the burner circuit when the water level drops too low. Low water can be caused by a leaking radiator or pipe, or by a cracked boiler section. This conductance-type boiler safety control is also called a low water cutoff, LWCO or boiler water level control.

Key Features:

• Electronic, conductance-type operation that cuts off the burner when a low water condition is detected
• Self-cleaning probe that limits scale build-up and extends the recommended cleaning interval
• Test button that confirms proper operation without draining any part of the system
• Red LED low water indicator and green LED power indicator for quick status checks
• Easy to install and wire, with threaded connections for secure installation
• Designed per the UL 353 standard
• Suited to residential hot water boiler applications, with models available for different control voltages

McDonnell & Miller, a Xylem brand, has been a trusted name in boiler controls and safety for about a century. A low water cut-off helps meet code requirements for boiler protection. It also gives homeowners and installers dependable protection for hydronic heating systems.