Resideo FM911 Valve

The Resideo FM911 (identical to the FM911/U) is a high-performance boiler fill valve and backflow preventer combo engineered for precise hydronic heating system maintenance. This 1/2-inch assembly features a pressure regulating valve factory-preset at 12 PSI, though it is field-adjustable from 4 to 60 PSI to accommodate systems in buildings up to 12 stories. Designed specifically for expansion tank mounting, the unit utilizes a balanced-seat piston design to ensure stable outlet pressure despite fluctuations in the supply line.

For service efficiency, this dual-unit assembly incorporates a fast fill feature and an integrated check valve. The robust brass construction and stainless steel filter protect internal components from debris, maintaining the integrity of the boiler feed water supply. This model includes a union connection with both NPT and sweat tailpieces, providing maximum installation flexibility for contractors working with varying piping configurations.

• Dual-Function Assembly: Combines a pressure reducing valve and backflow preventer into a single hardware footprint for streamlined installation.
• Adaptive Pressure Control: Featuring Dial-Set technology, the regulator allows for easy adjustments between 4 and 60 PSI to meet specific system head requirements.
• Contractor-Grade Durability: Built with a corrosion-resistant brass body and a high-capacity stainless steel strainer to prevent clogging.
• Universal Connections: Equipped with 1/2" NPT and sweat union fittings, simplifying retrofits and new installs.
• Maintains System Isolation: Prevents contaminated boiler water from re-entering the potable supply, ensuring compliance with local plumbing codes.

What is the difference between the FM911 and FM911/U?
Technically, they are identical units. The "/U" designation typically refers to the retail or "universal" packaging, but the specifications, pressure range, and 1/2-inch fittings remain the same.

Can this valve be used on high-rise residential systems?
Yes, the Resideo FM911 is rated for buildings up to 12 stories, provided the system pressure requirements fall within the 4-60 PSI adjustable range.

Is the backflow preventer component field-serviceable?
Yes, the assembly is designed for professional maintenance, featuring a manual shut-off and easily accessible internal components for cleaning the stainless steel filter.

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.