Ao Smith 100110095 Low Water Cut-off 120V with Probe

Product Description

The AO SMITH 100110095 is a low water cut-off (LWCO) control designed to protect boilers and hydronic heating systems from damage caused by insufficient water levels. Operating at 120 volts, it includes an integrated probe that senses water presence in the vessel. When water drops below the probe tip, the control interrupts the burner circuit, preventing dry-fire conditions that can cause catastrophic heat exchanger failure. This device is installed by licensed plumbers, HVAC technicians, or boiler specialists as a primary safety control in residential and light commercial heating systems.

The 100110095 is suited for residential and light commercial boiler applications where a probe-style low water cut-off is required. Probe-type LWCOs are commonly installed on steam boilers and hot water boilers where continuous water level monitoring is necessary to maintain safe operating conditions. The 120-volt operating voltage makes it compatible with standard residential and commercial boiler control circuits without additional transformers or step-down wiring.

Key Features

• Probe-based water sensing interrupts burner circuit when water level drops below safe threshold
• 120-volt operating voltage compatible with standard boiler control wiring
• Designed to prevent dry-fire damage to boiler heat exchangers
• Functions as a primary safety control in hydronic and steam heating systems

Compatibility

Designed as an OEM-style replacement low water cut-off control for residential and light commercial boilers requiring a 120-volt probe-type LWCO safety device.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or boiler technician in accordance with local mechanical codes and the boiler manufacturer's guidelines. Shut off power to the boiler and allow the system to cool and depressurize before removing or installing any controls. Verify the probe is fully seated and the electrical connections are secure before restoring power. Consult local jurisdiction requirements, as LWCO devices on steam and hot water boilers may be subject to ASME or jurisdictional inspection.

Technical Specifications

• Type: Low Water Cut-Off (LWCO)
• Operating Voltage: 120 volts
• Sensing Method: Probe

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100110095