Description
Xylem-McDonnell & Miller 51-S-HD Mechanical Water Feeder — Head Mechanism Only
The McDonnell & Miller 51-S-HD is a reliable mechanical water feeder engineered to maintain safe and consistent water levels in low-pressure steam and hot water boiler systems. Sold as the head mechanism only (Part Number 135800), this unit is an ideal replacement or upgrade component for existing installations, allowing technicians to service the feeder without replacing the entire assembly.
Key Features
- Designed for low-pressure steam and hot water boiler applications
- 35 PSI maximum vessel pressure rating for dependable performance in residential and light commercial systems
- Head mechanism only configuration (Part Number 135800) — simplifies replacement and reduces service costs
- Mechanical operation provides automatic water feeding without electrical components in the feed mechanism
- Manufactured by McDonnell & Miller, a trusted Xylem brand with decades of boiler control expertise
- Built for durability and long service life in demanding hydronic and steam environments
Product Specifications
- Model: 51-S-HD
- Part Number: 135800
- Application: Low-pressure steam and hot water boilers
- Maximum Vessel Pressure: 35 PSI
- Configuration: Head mechanism only
- Brand: McDonnell & Miller (Xylem)
Application
The 51-S-HD mechanical water feeder automatically supplies make-up water to a boiler when the water level drops below the desired operating point. By maintaining proper water levels, it helps protect the boiler from low-water damage and ensures efficient, safe system operation. The head-only design makes it a cost-effective solution for field replacement when the existing body remains serviceable.
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