McDonnell & Miller 51S Water Feeder/Low Water Cut-Off

The McDonnell & Miller 51S Water Feeder is a reliable Water Feeder/Low Water Cut-Off for boiler systems, delivering automatic water feed and protecting against hazardous low-water conditions. Featuring a 1 inch threaded port and mechanical actuation, it offers precise control and durable performance across typical commercial boilers. Designed for 120/240 VAC operation, this unit balances efficiency with durability, ensuring dependable startup and steady operation.

Key specifications and features:

• 1 inch threaded port
• Mechanical actuation
• 120/240 VAC input, 60 Hz
• Full-load current: 10.2 A at 120 V / 5.1 A at 240 V
• Locked-rotor current: 61.2 A at 120 V / 30.6 A at 240 V
• Overall diameter: 10-3/8 inches
• Water inlet temperature rating: 120°F
• Water pressure: 100 PSI; vessel pressure: 35 PSI
• Media handled: Water
• UL and CSA compliant

Engineered for safety and reliability, the 51S integrates smoothly into commercial boiler rooms, helping prevent boiler damage and downtime while meeting standard compliance requirements.