McDonnell & Miller 25A-HD Water Feeder

The McDonnell & Miller 25A-HD Water Feeder (Part Number 127100) is a heavy-duty make-up water feeder engineered specifically for boiler receiver tanks in commercial and industrial hydronic systems. This Series 25-A head mechanism is designed for applications where maintaining a precise water level is critical to preventing pump cavitation and ensuring dry fire protection. Rated for a 35 PSI max vessel pressure and a 100 PSI maximum supply pressure, the 25A-HD utilizes a high-capacity float-operated valve to provide automatic water replenishment. The rugged construction of this 18.50 lb unit ensures it withstands the thermal cycling and mechanical stress common in high-demand boiler rooms. This model is the standard choice for contractors looking to replace or upgrade McDonnell & Miller 25A assemblies, offering seamless mechanical integration with existing boiler feed water systems to maintain optimal system pressure and operational reliability.

Key Benefits:

• Mechanical Precision: Heavy-duty head mechanism provides accurate float-operated water level control for receiver tanks.
• High Pressure Capability: Engineered to handle 35 PSI max vessel pressure, making it suitable for a wide range of low-pressure steam and hot water applications.
• Direct Replacement: Designated as Part Number 127100, ensuring exact fitment and reduced labor time during field service.
• Industrial Durability: Built with high-grade components to resist scale buildup and ensure consistent make-up water flow.
• Optimized Performance: Facilitates consistent boiler feed pump operation by keeping receiver levels within specified tolerances.

Common Questions:

Can the 25A-HD be used on a steam boiler directly?
No, the 25A-HD is a make-up water feeder designed for boiler receiver tanks or storage tanks. For direct boiler mounting, refer to the Series 51 or 101-A feeders designed for low-water cut-off integration.

What is the difference between the 25A and the 25A-HD?
The 25A-HD features a heavy-duty construction specifically optimized for higher demand cycles and commercial environments, maintaining compatibility with standard Series 25-A piping configurations.

Does this unit include the specific float linkage?
Yes, as a head mechanism only (127100), it includes the internal float and valve assembly required to restore full functionality to an existing McDonnell & Miller housing.

This item is not eligible for free shipping.

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.