Xylem 51-2 Mechanical Water Feeder with Low Water Cutoff

The Xylem 51-2 (McDonnell & Miller Series 51-2) is a combination float-type mechanical water feeder and low water cutoff (LWCO) designed for low pressure steam and hot water boilers larger than 5,000 square feet capacity. This professional-grade boiler control system provides automatic water level maintenance and safety protection for commercial and industrial heating systems.

Key Features:

• Mechanical water feeder with integrated low water cutoff function
• Equipped with automatic reset 120-volt No. 2 cutoff switch for enhanced safety
• Quick-change replaceable cartridge valve and strainer for easy maintenance
• Proportional feed action ensures precise water level control
• Continuous maintenance of minimum safe water level independent of electrical service
• 1-inch pipe connections with 3/4-inch feeder connections
• Compatible with steam boilers up to 12,000 square feet capacity

Specifications:

• Maximum water supply pressure: 150 PSI
• Maximum inlet water temperature: 120°F (49°C)
• Maximum vessel pressure: 35 PSI
• Connection type: Screwed/threaded
• Suitable for cold water feed systems

The Series 51-2 provides reliable boiler protection by automatically feeding water to maintain proper water levels while simultaneously monitoring for low water conditions that could damage the boiler. The float-type mechanism operates mechanically, ensuring continuous protection even during power outages.