Description
Xylem-McDonnell & Miller 67-G Mechanical Low Water Cut Off
The Xylem-McDonnell & Miller 67-G is a reliable, auto-reset mechanical low water cut off (LWCO) engineered specifically for steam boilers and millivolt service applications. Designed to protect your boiler from the dangers of low water conditions, the 67-G automatically shuts down burner operation when water drops below a safe level — and resets itself once proper water level is restored, minimizing downtime and manual intervention.
With a 3/4″ NPT connection and a maximum boiler pressure rating of 20 PSI, this unit is well-suited for residential and light commercial steam heating systems. Its mechanical float-based design provides dependable, electrically independent operation, making it an ideal solution for millivolt (standing pilot) heating systems where no external power source is available.
Key Features
- Auto-reset operation — automatically restores burner function when safe water level returns
- Mechanical float design — no external power required, compatible with millivolt service
- 3/4″ NPT connection for straightforward installation on standard boiler tappings
- 20 PSI maximum boiler pressure rating — suitable for residential and light commercial steam systems
- Designed for steam boiler applications to prevent dry-fire damage
- Part Number: 149600
- SKU: 67-G
Specifications
- Brand: Xylem-McDonnell & Miller
- Model: 67-G
- Part Number: 149600
- Connection Size: 3/4″ NPT
- Maximum Boiler Pressure: 20 PSI
- Reset Type: Automatic
- Control Type: Mechanical (Float-Based)
- Application: Steam Boilers, Millivolt Service
Application
The 67-G is the go-to choice for steam boiler protection in systems utilizing millivolt (standing pilot) controls, where conventional electrically powered LWCOs are not suitable. Its mechanical float mechanism ensures consistent, code-compliant low water protection without reliance on line voltage, making it a trusted solution for heating contractors and boiler technicians.
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