Ao Smith 100074216 Burner Gasket Kit

Product Description

The AO SMITH 100074216 is a burner gasket kit designed to restore a proper combustion-chamber seal on AO Smith tankless and storage water heaters. The kit contains the gasket components needed to reseal the burner assembly during routine maintenance or after burner removal for service. A failed or compressed burner gasket can cause flue gas leaks, combustion inefficiency, and safety hazards, making this a critical replacement part. Licensed plumbers and water heater technicians install this kit as part of burner service on both natural gas and liquid propane units across a wide range of AO Smith models.

This gasket kit is used across AO Smith residential and light-commercial tankless and storage water heater models in both indoor and outdoor configurations. It covers natural gas and liquid propane variants, including direct-vent and open-combustion units. The broad model compatibility makes it a practical stocking item for service technicians who regularly service AO Smith equipment. Refer to the compatibility list below for the full range of confirmed applicable models.

Key Features

• Restores burner assembly seal to factory specification
• Compatible with both natural gas and liquid propane heater variants
• Covers indoor, outdoor, direct-vent, and open-combustion configurations
• OEM replacement part for reliable fit and performance
• Supports routine burner maintenance and field repair

Compatibility

Confirmed compatible models include: TK-540P-NIH (NG), T-K3-OS (LP), T-H2-DV (NG), T-KJR2-IN (LP), T-H2S-OS (LP), T-K3-SP (LP), T-H2S-DV (NG), T-K4-OS (NG), T-K3 (NG), T-H3J-DV (NG), TK-540P-PIH (LP), T-H2-OS (NG), T-D2-IN (NG), T-K3-OS (NG), T-K4-IN (LP), T-K3-PRO (NG), T-K3-PRO (LP), T-H2-OS (LP), T-K4-OS (LP), T-D2-OS (LP), T-H3-DV (LP), T-H3S-OS (LP), T-D2-OS (NG), T-K3-SP (NG), TK-540P-PEH (LP), T-K4-IN (NG), T-H2-DV (LP), T-D2-IN (LP), T-H3J-DV (LP), T-H2S-DV (LP), TK-540P-NEH (NG), T-KJR2-OS (LP), T-H3-DV (NG), T-H3-OS (LP), T-H2S-OS (NG), T-KJR2-IN (NG), T-H3S-DV (LP), T-H3-OS (NG), T-H3J-OS (NG), T-H3S-OS (NG), T-K3 (LP), T-H3J-OS (LP), T-KJR2-OS (NG), T-H3S-DV (NG).

Installation Notes

Installation should be performed by a licensed plumber or qualified water heater technician in accordance with local codes and the manufacturer service documentation. Before beginning any burner service, shut off the gas supply at the service valve and disconnect power to the unit. Allow the heat exchanger and burner components to cool completely before removal. Inspect the burner mounting surface for debris or corrosion before seating the new gasket to ensure a proper seal.

Technical Specifications

• Part Type: Burner Gasket Kit
• Fuel Type Compatibility: Natural Gas and Liquid Propane

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100074216