McDonnell & Miller 25-A Water Feeder

The McDonnell & Miller 25-A (Part Number 126800) is a heavy-duty, float-operated make-up water feeder specifically engineered for boiler receiver tanks and condensate return systems. Built with a rugged iron and bronze body, this mechanical feeder ensures a constant water level without the need for electrical components, making it a fail-safe choice for steam boiler maintenance. It utilizes proportional feed action to deliver a steady volume of water as needed, effectively preventing the "hunting" or rapid cycling common in lesser valves. With a 1" NPT connection and 1" equalizing lines, it supports high-capacity flows—up to 12.5 gallons per minute at a 35 psi differential. The integrated replaceable strainer protects the valve seat from line debris, ensuring a long-term, positive seal. Designed for reliability in demanding commercial environments, the 126800 water feeder handles a max vessel pressure of 35 psi and a water supply pressure up to 100 psi.

• Mechanical Precision: The float-operated design provides independent operation from electrical services, ensuring boiler water level control even during power outages.
• Enhanced Durability: Soft-seat construction and a built-in strainer minimize leakage and protect internal components from sediment or scale buildup.
• Proportional Feed: Optimizes water delivery by matching the feed rate to the system demand, reducing thermal shock to the receiver tank.
• Field Serviceable: Features a removable head assembly, allowing for rapid internal component replacement without disturbing the equalizing pipework.

• What is the maximum pressure for the McDonnell & Miller 25-A? The unit is rated for a maximum vessel pressure of 35 psi and a maximum water supply pressure of 100 psi.
• Can this be used on pressurized receiver tanks? Yes, provided the vessel pressure does not exceed the 35 psi limit. It is ideal for condensate receiving tanks in steam systems.
• What size are the equalizing connections? This model uses 1" NPT top and bottom equalizing connections to ensure accurate float response to water level changes.

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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.