Lochinvar & A.O. Smith 100109318 Burner Assembly 321042-401 they are functionally identical parts

they are functionally identical parts and fully interchangeable in the field

1 Watts to provide reliable actuation while minimizing energy overhead

the pressure-temperature curve differs

Since the unit is self-powered by the monitored conductor

Lochinvar & A.O. Smith 100109318 Burner Assembly 321042-401 they are functionally identical partsThe Lochinvar & A. O. Smith 100109318 Burner Assembly is a direct replacement LP gas burner engineered for high efficiency water heater maintenance and repair. This LP FV Burner ASSY features a #51 orifice specifically calibrated for Liquid Propane applications, ensuring precise fuel to air ratios and stable combustion performance. Designed for units utilizing Flammable Vapor (FV) ignition technology, this assembly addresses common water heater pilot