Xylem McDonnell & Miller 221 Float-Operated Make-Up Water Feeder for Boiler Receiver Tanks

The Xylem McDonnell & Miller 221 (Part No. 126600) is a float-operated make-up water feeder engineered for direct mounting into boiler receiver tanks. By mounting directly to the receiver tank, the Series 221 eliminates the need for equalizing connections, simplifying installation and reducing potential leak points in steam boiler systems.

The unit delivers proportional feed action to maintain consistent water levels, while a soft seat valve design ensures a positive, drip-free seal. The rugged construction is built to handle the demands of commercial and industrial steam boiler applications, providing continuous protection against low-water conditions.

Key Features:

• Float-operated design for reliable, automatic water level control
• Direct mounting to boiler receiver tanks — no equalizing connections required
• Proportional feed action for accurate water level maintenance
• Soft seat valve provides positive, leak-free seal
• 3/4" NPT screwed connection for easy plumbing integration
• Mounting flange with six 17/32" bolt holes on an 8-1/2" bolt circle
• 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)

The McDonnell & Miller 221 is an ideal solution for commercial and industrial steam boiler systems requiring dependable automatic make-up water control. Also referenced by part number 126600.