Watts B911S Boiler Combination Fill Valve and Backflow Preventer

The Watts B911S Boiler Combination Fill Valve and Backflow Preventer is a durable, space-saving solution for maintaining proper boiler fill and backflow protection in hydronic heating systems. With its bronze body and precision engineering, this unit delivers dependable performance in both commercial and residential settings.

Designed for a 1/2 inch nominal size, the Watts B911S combines a high-capacity fill valve with a backflow preventer to safeguard your system. It features soldered union x threaded end connections for versatile installation, and a compact 8-1/2 inch end-to-end distance to fit tight boiler rooms. Rated for up to 212°F and 100 PSI, it handles demanding hot-water applications with ease.

• Very high-capacity fill valve for rapid system filling and steady pressure
• Bronze body delivers durability and corrosion resistance
• Backflow preventer integrated protects potable water and boiler circuits
• End connections: soldered union x threaded for flexible installation
• End-to-end distance: 8-1/2 inch fits standard boiler configurations
• Suitable for commercial and residential hydronic heating systems