Ao Smith 100112274 Lp Final Burner Assembly 18 in 51 Orifice

Product Description

The AO SMITH 100112274 is an 18-inch liquid propane final burner assembly kit designed for residential and light commercial water heater heating systems. This kit provides the burner assembly and a No. 51 orifice sized and calibrated for LP gas service. It serves as a direct service component for licensed plumbers, HVAC technicians, and water heater service professionals performing burner section repairs or fuel-type-specific replacements. The 18-inch assembly length and LP-specific orifice sizing are the two critical spec points that define correct application for this part.

This burner assembly kit is intended for LP gas heating applications, specifically water heater units requiring an 18-inch burner assembly. The No. 51 orifice is factory-sized for liquid propane fuel delivery, making this kit appropriate for installations where the water heater is connected to a propane supply rather than natural gas. Service technicians replacing a failed or damaged burner assembly should confirm the fuel type and burner length of the existing unit before installation.

Key Features

• Liquid propane (LP) rated burner assembly for propane-supplied water heater systems
• 18-inch assembly length for correct fitment in compatible AO SMITH water heater models
• Includes No. 51 orifice sized specifically for LP gas fuel delivery
• Complete kit format simplifies burner section service and reduces parts sourcing time
• OEM part number 100112274 ensures direct manufacturer traceability

Compatibility

Designed as an OEM-style LP burner assembly replacement for AO SMITH water heaters requiring an 18-inch burner section with a No. 51 LP orifice. Confirm burner length, fuel type, and model compatibility before installation.

Installation Notes

Installation should be performed by a licensed plumber or qualified water heater service technician. Shut off the propane gas supply and disconnect power or pilot before beginning burner section disassembly. Follow all applicable local gas codes and manufacturer service documentation during reassembly. Verify gas pressure and leak-test all connections at the burner and supply line after installation is complete.

Technical Specifications

• Fuel Type: Liquid Propane (LP)
• Application: Heating
• Burner Assembly Length: 18 inches
• Orifice Size: No. 51

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100112274