5°F Warm On

ensuring efficient transition between heat sources

If the transformer is failing

consistent rotation in horizontal or vertical orientations

Lochinvar & A.O. Smith 100109355 Ignitor Assembly 326058-757 5°F Warm OnThe Lochinvar & A. O. Smith 100109355 Ignitor Assembly is a mission critical hot surface igniter (HSI) replacement designed for high efficiency natural gas (NG) water heaters. Engineered to meet strict OEM specifications, this assembly functions as the primary ignition source for the burner, ensuring reliable light off and consistent flame rectification. As the direct updated replacement for the legacy 9003626005 part number, the 100109355 features a