The Lochinvar igniter is designed for compatible boiler and heater applications where the ignition component needs replacement. An igniter is useful because it helps initiate burner operation, supporting dependable startup and more consistent equipment performance.This replacement is especially useful when the original igniter is cracked, weak, damaged, or no longer producing proper ignition. Including the gasket helps support cleaner installation and dependable sealing at the mounting point.The 100165919 is a practical service part when a compatible Lochinvar boiler or heater needs an igniter to restore dependable startup performance. Lochinvar igniter Fits compatible boilers and heaters Includes gasket Useful when the original igniter is damaged or failing Supports cleaner and more dependable ignition performance