Description
Xylem-McDonnell & Miller Model 21 Make-Up Water Feeder
The Xylem-McDonnell & Miller Model 21 is a reliable make-up water feeder engineered for use with boiler receiver tanks in hydronic heating systems. Designed to automatically maintain proper water levels, this feeder helps protect your boiler from low-water conditions and ensures consistent system performance. With a robust construction and straightforward installation, the Model 21 is a trusted solution for commercial and residential boiler applications.
Key Features
- Automatic make-up water feed for boiler receiver tanks
- 35 PSI maximum vessel pressure rating for safe, dependable operation
- 3/4″ NPT connection for easy integration with standard piping
- 5-3/4″ bolt circle for secure, precise mounting
- Maintains proper water levels to protect boiler equipment
- Durable construction built for long-term hydronic system service
- Part Number: 126400
Specifications
- Model: 21
- Part Number: 126400
- Max Vessel Pressure: 35 PSI
- Connection Size: 3/4″ NPT
- Bolt Circle: 5-3/4″
- Application: Boiler Receiver Tanks
- Brand: Xylem-McDonnell & Miller
Application
The Model 21 make-up water feeder is ideal for hydronic heating systems where maintaining a consistent water supply to the boiler receiver tank is critical. It automatically replenishes water lost through evaporation or minor system leaks, reducing manual intervention and minimizing the risk of boiler damage due to low water levels.







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