Low Water Cut-Off with Quick Connect Harness, 24 V

Weil-McLain 511100005 Low Water Cut-Off (24V) – Dependable Protection for Boiler Safety

The Weil-McLain 511100005 Low Water Cut-Off is a vital safety control engineered to protect hot water boilers from dry-fire damage. Operating on a 24-volt circuit, this control automatically interrupts burner function if water levels fall below the safe threshold—helping prevent overheating, system failure, and costly repairs.

Designed for Safety. Built for Performance.

This low water cut-off is ideal for residential and light commercial boiler systems, offering field-tested reliability and long-term durability. Designed for installation in return piping near the boiler’s minimum safe water level, the 511100005 continuously monitors conditions and acts immediately when a low-water event occurs.

Product Highlights

• Automatic Low-Water Shutdown: Cuts burner power to prevent operation during unsafe water levels.
• 24V Control Voltage: Compatible with standard hydronic heating system circuits.
• Reliable System Monitoring: Continuously supervises water level and automatically resets when conditions normalize.
• Durable Construction: Engineered to withstand the environmental demands of mechanical rooms and boiler applications.
• Service-Friendly Design: Built for easy access and routine maintenance, including probe cleaning.

Installation Notes

The Weil-McLain 511100005 is designed for ease of integration but should be installed by a licensed HVAC or plumbing technician to ensure proper function and code compliance. The unit mounts directly into the boiler's return piping and interfaces with the burner circuit for seamless operation.

For Professional Contractors

This model offers dependable low-water protection in systems where performance and safety can’t be compromised. It's a smart choice for any hydronic project requiring reliable automatic cutoff functionality and integration with 24V controls.

Technical Specifications

• Manufacturer: Weil-McLain
• Model Number: 511100005
• Voltage: 24 VAC
• Type: Electronic low water cut-off for hot water boilers
• Reset Function: Automatic upon restoration of safe water level
• Application: Residential and light commercial boilers

Why Install the Weil-McLain 511100005?

• Protects Boiler Equipment: Automatically shuts down burner in low-water events to prevent damage.
• Improves System Longevity: Reduces risks of overheating and cracked heat exchangers.
• Compact & Efficient: Installs easily and provides around-the-clock system oversight.

Safety You Can Rely On

Don’t leave your boiler’s protection to chance. The Weil-McLain 511100005 Low Water Cut-Off delivers the performance and reliability contractors demand to keep hydronic systems safe and efficient. Install with confidence—and protect what matters most.