Xylem 47X McDonnell & Miller Mechanical Water Feeder for Steam & Hot Water Boilers

The Xylem McDonnell & Miller 47X is a float-type mechanical water feeder designed to maintain safe and consistent water levels in residential and commercial steam and hot water boiler systems. Operating without electricity, the 47X uses proven proportional feed action to automatically replenish water as needed, providing continuous protection against low water conditions independent of electrical service.

Key Features:

• Fully mechanical operation — functions without electrical power for reliable, fail-safe performance
• Proportional feed action — continuously maintains the minimum safe boiler water level
• Float-type design — durable and time-tested for long-term dependability
• Field upgradeable — can be upgraded in the field with a No. 2 switch to add low water cut-off (LWCO) function, converting to Model 47X-2
• Quick-change cartridge valve and strainer — simplifies routine maintenance and servicing
• Compatible with cold-water feed systems — suitable for steam and hot water boiler applications
• Maximum water supply pressure: 150 psi (10.5 kg/cm²)
• Maximum inlet water temperature: 120°F (49°C)
• Maximum boiler pressure: 25 psi (1.8 kg/cm²)

The McDonnell & Miller 47X is part of Xylem's trusted Series 47 line of boiler water feeders, engineered for reliable performance in industrial, commercial, and residential building heating applications. This model ships without quick hook-up fittings, making it ideal for installations where standard pipe connections are preferred.