Xylem 21 McDonnell & Miller Make-Up Water Feeder for Boiler Receiver Tanks

The Xylem McDonnell & Miller Model 21 is a make-up water feeder designed for boiler receiver tanks, providing reliable automatic water level control for steam and hot water boiler systems. This float-operated feeder ensures consistent water levels through proportional feed action, maintaining optimal boiler performance and safety.

Key Features:

• Direct mounting via mounting flange with six 7/16" bolt holes on a 5-3/4" bolt circle, eliminating the need for equalizing connections
• Float-operated proportional feed action for accurate water level maintenance
• Soft seat design provides positive seal against leakage
• Includes strainer assembly with 3/4" NPT female-threaded connection
• Durable construction for long-term reliability in commercial and industrial applications

Specifications:

• Maximum water supply pressure: 150 PSI (10.5 kg/cm²)
• Maximum inlet water temperature: 120°F (49°C)
• Maximum vessel pressure: 35 PSI (2.5 kg/cm²)
• Connection type: 3/4" NPT screwed connection

The Model 21 simplifies installation and maintenance while providing dependable automatic water feed control for boiler systems. Also known by manufacturer part number 126400.