McDonnell & Miller 51-2 Water Feeder with Cut-Off 135000

Original price was: $1,579.85.Current price is: $1,297.73.

5 in stock

SKU: 38302 Category:


The McDonnell & Miller 51-2 Water Feeder with Cut-Off is a combination device for low-pressure steam and hot water boilers, serving two crucial functions:

1. Water Feeder:

  • Automatically maintains the minimum safe water level in the boiler, eliminating the need for manual filling and ensuring optimal boiler operation.
  • Works independently of electricity, providing continuous protection even during power outages.
  • Features proportional feed action, meaning the water is steadily added as the level drops, preventing sudden fluctuations and maintaining ideal boiler conditions.

2. Low Water Cut-Off (LWCO):

  • Monitors the water level and automatically shuts down the boiler burner if it falls below a critical point.
  • This prevents potentially damaging low water conditions and safeguards against boiler explosions.
  • Features a No. 2 switch that can be used for additional control functions, such as activating an alarm or an electric water feeder, upon low water detection.

Key Features:

  • Quick-change replaceable cartridge valve and strainer for simplified maintenance.
  • Maximum water supply pressure: 150 psi
  • Maximum inlet water temperature: 120°F (49°C)
  • Available in different connection sizes and with various options for manual reset and low water alarm functionality.


  • Enhanced safety: Protects your boiler from the dangers of low water and potential explosions.
  • Increased efficiency: Maintains the ideal water level for optimal boiler performance and fuel savings.
  • Peace of mind: Provides continuous monitoring and automatic response to water level changes, even without electricity.
  • Reliable performance: Proven design and durable construction ensure long-lasting operation.
  • Versatility: Suitable for various boiler types and offers additional control options through the No. 2 switch.

Things to consider:

  • Compatibility: Ensure the 51-2 model matches your boiler type, pressure rating, and water temperature requirements.
  • Installation: Proper installation by a qualified technician is crucial for safety and optimal performance.
  • Maintenance: Regular inspection and testing are recommended to ensure both the Water Feeder and LWCO functions are working correctly.

Overall, the McDonnell & Miller 51-2 Water Feeder with Cut-Off is a valuable and versatile solution for maintaining ideal water levels and protecting your low-pressure steam or hot water boiler. Its combination of automatic features, ease of use, and reliable performance makes it a popular choice for boiler safety and efficiency.

Additional information

Weight 11.79 lbs


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