System Modernization: Replaces obsolete Honeywell and Johnson Control ignition systems with current UCS technology

consistent rotation in horizontal or vertical orientations

5°F Warm On

The Honeywell 311852 is technically identical to the 311852/U (universal) model

24V coil ensures compatibility with standard HVAC control circuits

Lochinvar & A.O. Smith 100109355 Ignitor Assembly 326058-757 System Modernization: Replaces obsolete HoneywellThe 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