Ao Smith 100109200 Natural Gas Burner Assembly 40000 Btu/h

Product Description

The AO SMITH 100109200 is a natural gas burner assembly rated at 40,000 BTU/h, designed for residential water heating applications. This assembly delivers the combustion output needed to maintain consistent water temperature inside a natural gas storage water heater. The unit features a 33-orifice configuration that distributes the gas-air mixture evenly across the burner surface for stable, efficient combustion. Licensed plumbers and HVAC technicians install this assembly as a direct OEM-style replacement during burner failure, corrosion damage, or routine combustion system service.

This burner assembly is suited for natural gas water heater systems in residential heating applications. It is specified for systems where the original burner has degraded, producing inconsistent flame, sooting, or ignition failure. The 40,000 BTU/h output rating makes it appropriate for standard tank-style natural gas water heaters. Installation is performed during scheduled maintenance or in response to combustion system faults diagnosed during a service call.

Key Features

• 40,000 BTU/h output rating for consistent water heating performance
• 33-orifice burner configuration for even gas-air distribution across the burner surface
• Natural gas (NG) fuel type — not compatible with LP or propane systems
• OEM-style replacement designed for water heater combustion system service
• Intended for residential heating applications

Compatibility

Designed as an OEM-style replacement burner assembly for natural gas storage water heaters rated at 40,000 BTU/h. Consult the water heater nameplate and AO SMITH parts documentation to confirm fitment before installation.

Installation Notes

This assembly is installed by a licensed plumber or qualified gas appliance technician. Before servicing, shut off the gas supply at the manual shutoff valve and allow the water heater to cool. Work must comply with local gas codes and applicable sections of the International Fuel Gas Code (IFGC). Do not attempt to modify the orifice or burner components — install the assembly as supplied.

Technical Specifications

• Fuel Type: Natural Gas (NG)
• Burner Output: 40,000 BTU/h
• Orifice Count: 33
• Application: Heating

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100109200