Xylem-McDonnell & Miller 51-S Mechanical Water Feeder, 35 PSI, 1″ NPT (135600)

The Xylem-McDonnell & Miller 51-S is a reliable mechanical water feeder engineered for use with low pressure steam and hot water boilers. Designed to automatically maintain proper water levels, this feeder helps protect boiler systems from the hazards of low-water conditions — reducing the risk of equipment damage and costly downtime.

Product Overview

The 51-S operates on a proven mechanical design, delivering dependable water feeding performance without the need for electrical controls. Its straightforward construction makes it a trusted choice for residential and light commercial boiler applications where consistent water level maintenance is essential.

Key Features

• Mechanical water feeder design — no electrical components required
• Compatible with low pressure steam and hot water boiler systems
• 35 PSI maximum vessel pressure rating
• 1″ NPT inlet and outlet connections for easy installation
• Automatically feeds water to maintain safe boiler water levels
• Durable construction built to withstand demanding boiler environments
• Part Number: 135600

Specifications

• Model: 51-S
• Part Number: 135600
• Application: Low pressure steam and hot water boilers
• Maximum Vessel Pressure: 35 PSI
• Connection Size: 1″ NPT
• Brand: Xylem-McDonnell & Miller

Why Choose the McDonnell & Miller 51-S?

McDonnell & Miller, a trusted Xylem brand, has been a leader in boiler water level controls and feeders for decades. The 51-S continues that legacy with a no-nonsense mechanical design that HVAC professionals and building engineers rely on for long-term, low-maintenance performance in steam and hot water heating systems.