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The AO SMITH 100112748 is a final burner assembly kit configured for liquefied petroleum (LP) gas. This kit delivers the burner hardware needed to restore proper combustion at the end of a multi-burner array in a gas water heater. The assembly is sized at 16 inches and uses a No. 51 orifice, which is calibrated for LP gas fuel delivery. Licensed plumbers and gas appliance technicians install this part during burner replacement or combustion system service on compatible AO Smith water heaters.
This kit is designed for use in residential or light-commercial gas water heater applications running on LP gas. It is typically installed as a service replacement when the final burner position in the burner assembly shows signs of wear, damage, or improper combustion. The 16-inch length and No. 51 orifice size are key fitment factors that must match the existing burner configuration before installation.
Designed as an OEM-style replacement final burner assembly for AO Smith LP gas water heaters requiring a 16-inch burner with a No. 51 orifice. Verify existing burner length, orifice size, and fuel type before ordering.
Installation must be performed by a licensed plumber or qualified gas appliance technician in accordance with local codes and the International Fuel Gas Code (IFGC). Shut off the gas supply and allow all components to cool completely before beginning any burner service. Inspect the gas valve, manifold, and surrounding burner positions for wear or damage while the assembly is accessible. Confirm orifice size and fuel type match before placing the burner into service.
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