Ao Smith 100112349 Natural Gas Burner Assembly Kit 18in

Product Description

The AO SMITH 100112349 is an 18-inch natural gas final burner assembly kit designed for gas-fired water heater systems. This kit includes a 39-orifice burner assembly that meters and distributes natural gas for combustion within the burner chamber. It is an OEM-style replacement component intended for installation by licensed plumbers or HVAC technicians servicing residential or light commercial water heating equipment. The assembly provides the critical interface between the gas valve and the combustion chamber, ensuring proper flame propagation across the burner surface.

This burner assembly kit is sized at 18 inches and configured for natural gas (NG) fuel type, making it appropriate for standard residential water heater applications where natural gas is the fuel source. It is not compatible with propane (LP) systems without a dedicated LP conversion kit. Technicians replacing failed or degraded burner assemblies during routine service or warranty repair will find this kit provides all necessary burner components in a single assembly.

Key Features

• 18-inch burner assembly length sized for compatible water heater tank configurations
• 39-orifice design for controlled natural gas distribution across the burner surface
• Natural gas (NG) fuel type — not for use with propane without conversion
• Complete assembly kit format reduces sourcing of individual burner components
• Heating application rated for gas-fired water heater systems

Compatibility

Designed as an OEM-style replacement natural gas final burner assembly for compatible AO SMITH gas-fired water heaters requiring an 18-inch burner configuration with a 39-orifice specification. Confirm burner length and orifice count against the existing assembly before installation.

Installation Notes

Installation should be performed by a licensed plumber or qualified gas appliance technician in accordance with local codes and the IFGC. Shut off the gas supply and allow the water heater to cool completely before disassembling the burner compartment. Inspect the burner orifices, thermocouple, and gas valve connections before reinstalling and relighting. After installation, check all gas connections for leaks using an approved leak-detection solution before returning the unit to service.

Technical Specifications

• Fuel Type: Natural Gas (NG)
• Burner Length: 18 inches
• Orifice Count: 39
• Application: Heating

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100112349