Description
Xylem-McDonnell & Miller 63-HD Auto Reset Mechanical Low Water Cut Off
The McDonnell & Miller 63-HD is a reliable, auto reset mechanical low water cut off engineered for use on both hot water and steam boilers. Designed to protect your boiler from the hazards of low water conditions, this head mechanism automatically resets once safe water levels are restored — reducing manual intervention and downtime. Rated for up to 50 PSI maximum boiler pressure, the 63-HD is a proven solution for residential and light commercial hydronic and steam heating systems.
Key Features
- Auto reset operation — automatically resets when proper water level is restored
- Suitable for both hot water and steam boiler applications
- 50 PSI maximum boiler pressure rating
- Head mechanism only — mounts to compatible McDonnell & Miller body assemblies
- Mechanical float-based design for dependable low water detection
- Helps prevent boiler damage caused by low water conditions
- Part Number: 142600
Specifications
- Model: 63-HD
- Part Number: 142600
- Type: Auto Reset Mechanical Low Water Cut Off
- Application: Hot Water and Steam Boilers
- Maximum Boiler Pressure: 50 PSI
- Supply Included: Head Mechanism Only
- Brand: Xylem-McDonnell & Miller
Application
The 63-HD head mechanism is ideal for replacement or new installation on compatible McDonnell & Miller low water cut off bodies. It is well-suited for boiler rooms requiring a dependable, low-maintenance safety control that automatically returns to service after a low water event is resolved. Always verify compatibility with your existing body assembly before installation.
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