Description
The Xylem-McDonnell & Miller 64-B is a dependable, mechanical low water cut off (LWCO) engineered to protect hot water and steam boilers from the damaging effects of low water conditions. Featuring an automatic reset design with a float block mechanism, the 64-B continuously monitors boiler water levels and automatically shuts down burner operation whenever water drops below a safe threshold — then resets itself once safe water levels are restored, minimizing downtime and manual intervention.
Key Features
- Automatic reset operation — no manual intervention required after water level is restored
- Mechanical float block design for reliable, long-term water level sensing
- Compatible with both hot water and steam boiler systems
- 1″ NPT connection for straightforward installation into standard boiler tappings
- 50 PSI maximum boiler pressure rating
- Part Number: 143800
Why Low Water Protection Matters
Operating a boiler without adequate water can cause catastrophic heat exchanger damage, boiler failure, and serious safety hazards. The McDonnell & Miller 64-B provides a critical safeguard layer, cutting burner power before low water conditions can cause irreversible harm to the boiler vessel or connected piping.
Specifications
- Brand: Xylem-McDonnell & Miller
- Model: 64-B
- Part Number: 143800
- Connection Size: 1″ NPT
- Maximum Boiler Pressure: 50 PSI
- Reset Type: Automatic (Auto Reset)
- Control Type: Mechanical with Float Block
- Application: Hot Water and Steam Boilers
Applications
- Residential and light commercial hot water boilers
- Steam heating boiler systems
- Replacement low water cut off for existing boiler installations
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