Lochinvar & A.O. Smith 100208665 Low Water Cutoff

The Lochinvar & A.O. Smith 100208665 Low Water Cutoff is a critical safety component designed for high-efficiency hydronic boilers and water heating systems. This probe-style LWCO provides essential dry-fire protection by monitoring the water level within the heat exchanger. If a low-water condition occurs, the sensor interrupts the burner circuit to prevent catastrophic equipment failure. Engineered as an automatic reset Low Water Cutoff, it restores system operation once the safe water level is replenished, minimizing downtime for the end-user. This part is a direct factory replacement and is identical to WTR2528, ensuring seamless integration into existing control strings. It features a streamlined design for 24VAC systems and is typically compatible with Lochinvar Knight and A.O. Smith Legend series boilers. For contractors, the 100208665 offers a reliable solution for meeting CSD-1 code requirements regarding boiler safety limits. Ensure the boiler sensor probe is free of scale and debris during installation to maintain accurate conductivity readings.

• Direct Replacement: Designed as a 1:1 match for Lochinvar WTR2528, maintaining original equipment specifications.
• Automatic Reset Logic: Eliminates the need for manual intervention once water levels return to the safe operating range.
• System Protection: Effectively prevents thermal stress and cracked heat exchangers caused by dry firing.
• Technical Compatibility: Optimized for use in Lochinvar and A.O. Smith residential and commercial boiler platforms.

Is the 100208665 compatible with my existing WTR2528 sensor?
Yes, the Lochinvar 100208665 is the direct superseding part and is functionally identical to WTR2528, fitting the same mounting ports and wiring harnesses.

Does this unit require a manual reset after a low-water event?
No, this specific model is an auto reset low water cutoff. It will automatically close the burner circuit once the probe-style sensor detects sufficient water volume.

What are the symptoms of a failing boiler low water cutoff?
Common signs include ghost "low water" codes on the boiler control board, intermittent burner lockouts, or the unit failing to fire even when the system is fully bled of air.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.