McDonnell & Miller 247 Water Feeder

The McDonnell & Miller 247 is a heavy-duty mechanical water feeder designed for precise fluid level maintenance in low-pressure steam boilers and hot water heating systems. Engineered for high-capacity applications, this unit facilitates a cold water feed to maintain minimum safe water levels, preventing dry-fire conditions. The Part Number 133700 features a proportional feed action that responds immediately to boiler load changes, ensuring stable operation without the complexity of electronic controls. This field-proven feeder handles a maximum water pressure of 150 psi and a maximum steam pressure of 30 psi. Its rugged construction and float-operated valve mechanism make it a standard choice for contractors looking for reliable boiler water level control. The integration of proportional water leveling technology minimizes thermal shock by introducing water gradually, which protects the integrity of the boiler vessel during peak demand cycles.

Key Benefits

• Proportional Feeding: Delivers a steady flow based on actual water loss rather than simple on/off cycling.
• High-Capacity Throughput: Optimized for larger commercial and residential boilers requiring consistent makeup water.
• Simplified Maintenance: Mechanical float assembly provides a straightforward troubleshooting path for field technicians.
• Durable Construction: Built to withstand high-temperature environments and variable water inlet pressures up to 150 psi.

Common Questions

How do I determine if the 247 is the correct replacement for a boiler?
The McDonnell & Miller 247 is typically sized for boilers with higher steaming rates that exceed the capacity of the Series 101-A. Ensure your system operates under 30 psi steam pressure and requires a mechanical makeup water feeder.

Can this feeder be used on both steam and hot water systems?
Yes, it is designed for steam and hot water boiler compatibility, provided the pressure ratings are not exceeded and the application requires a cold water makeup source.

What is the primary difference between the 247 and the 247-2?
The standard 247 is a dedicated mechanical feeder, whereas the 247-2 includes an integral low water cut-off switch for secondary safety protection.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.