Lochinvar & A.O. Smith 100074640 Ignitor 319825-402 replacing the entire assembly is

replacing the entire assembly is often the standard practice to ensure long-term reliability and compliance with original equipment manufacturer specifications

Airtight Performance: High-temperature material prevents flue gas leakage and ensures consistent draft inducer operation

this reversible high-strength component expands the standard mounting capacity of Belimo LF series actuators

Flexible Connectivity: Standard barbed fitting ensures a secure grip on pneumatic tubing

Lochinvar & A.O. Smith 100074640 Ignitor 319825-402 replacing the entire assembly isThe Lochinvar & A. O. Smith 100074640 Ignitor is a critical genuine OEM ignition component engineered for high efficiency condensing water heaters and commercial boiler systems. Built to survive the rigorous thermal cycling of modern hydronic equipment, this black box ignitor assembly provides the high voltage spark necessary for consistent burner ignition and reliable system startup. As a standard replacement for Lochinvar Knight boilers and A. O.