Ao Smith 100108348 Gas Thermostat Natural Gas 55000 Btu/h

Product Description

The AO SMITH 100108348 is a natural gas thermostat designed for residential and light-commercial water heating applications. It regulates gas flow to the burner assembly based on water temperature demand, maintaining consistent output within the rated capacity of through 55,000 BTU/h. The thermostat mounts directly to the gas valve or control assembly and serves as a critical safety and control component in natural gas water heater systems. Licensed plumbers and HVAC technicians are the typical installers of this part during routine maintenance or component failure repairs.

This thermostat is rated for natural gas service at capacities through 55,000 BTU/h, making it suitable for standard residential tank-style water heaters. It is used in heating applications where precise temperature regulation of the stored water supply is required. Installations are most common in residential settings but may also apply to light-commercial units operating within the same BTU/h range. Consult the water heater unit nameplate and service documentation to confirm this thermostat matches the original equipment specification before installation.

Key Features

• Rated for natural gas (NG) fuel type — not compatible with LP or propane systems
• Supports heating applications through 55,000 BTU/h
• OEM-style replacement part for AO SMITH water heater systems
• Provides burner control and temperature regulation within the gas valve assembly

Compatibility

Designed as an OEM-style replacement gas thermostat for AO SMITH natural gas water heaters rated through 55,000 BTU/h in residential heating applications.

Installation Notes

Installation should be performed by a licensed plumber or qualified gas technician in accordance with local codes and the manufacturer service documentation. Shut off the gas supply and allow the unit to cool completely before removing or replacing any gas control or thermostat components. Do not overtighten fittings on the gas valve assembly; follow the equipment manufacturer torque guidance where provided in the service manual. Verify for gas leaks at all connections after restoring the gas supply before returning the unit to service.

Technical Specifications

• Fuel Type: Natural Gas (NG)
• BTU/h Rating: Through 55,000 BTU/h
• Application: Heating

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100108348