Ao Smith 100187920 Lp Final Burner Assembly Kit 51 Orifice

Product Description

The AO SMITH 100187920 is an LP final burner assembly kit designed for propane-fired water heating systems. This kit includes the final burner component fitted with a No. 51 orifice, sized for liquid propane fuel delivery at the correct flow rate for proper combustion. Final burner assemblies are a critical combustion component in gas water heaters, responsible for igniting and sustaining the flame that heats the water supply. This replacement kit is installed by licensed plumbers and HVAC technicians performing burner service or combustion-system restoration on propane water heaters.

This assembly is intended for propane (LP) heating applications. It is a direct replacement kit for AO SMITH water heaters configured for liquid propane fuel. The No. 51 orifice designation indicates a specific drill-size opening calibrated for LP gas pressure and BTU output requirements. Technicians servicing water heaters with degraded, damaged, or incorrectly orificed burner assemblies will use this kit to restore proper combustion performance.

Key Features

• Configured for liquid propane (LP) fuel with a No. 51 orifice for correct fuel metering
• Final burner assembly design provides a complete, ready-to-install combustion component
• OEM-style replacement for AO SMITH propane water heater burner systems
• Supports proper combustion efficiency and flame stability in LP heating applications

Compatibility

Designed as an OEM-style replacement for AO SMITH propane water heaters requiring a final burner assembly with a No. 51 orifice. Verify the orifice size and fuel type against the existing unit data plate before installation.

Installation Notes

Burner assembly replacement on gas water heaters should be performed by a licensed plumber or qualified gas appliance technician in accordance with local codes and IFGC requirements. Shut off the gas supply and allow the unit to cool completely before removing any burner components. Inspect the gas valve, manifold, and igniter connections before reinstalling the new assembly. Do not substitute orifice sizes or interchange LP and natural gas components.

Technical Specifications

• Fuel Type: Propane (LP)
• Orifice Size: No. 51
• Application: Heating

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100187920