The Lochinvar & A.O. Smith 100224099 Ignitor Rod is a genuine replacement ignition component designed for compatible gas-fired boilers, water heaters, and HVAC heating equipment. It works by generating the spark required to ignite the gas burner during the startup cycle, ensuring safe and reliable burner operation. https://www.partshnc.com/100224099-lochinvar-ao-smith-ignitor-rod