The Lochinvar & A.O. Smith 100191120 Spark Ignitor Assembly is a vital component utilized in gas-fired HVAC systems, such as boilers and water heaters. This part acts as the system's ignition source, producing sparks that ignite the fuel supply for the burner. The fuel-air combination inside the combustion chamber is ignited by sparks produced by the spark ignitor assembly when the he... https://www.partshnc.com/100191120-lochinvar-ao-smith-spark-ignitor-assembly