Gas Control Thermostat, Natural Gas

Rheem SP20303B Natural Gas Thermostat and Control Valve Assembly

The Rheem SP20303B is an OEM natural gas control thermostat designed for use in select Rheem water heaters. This component manages both the water temperature and the gas flow to the burner, maintaining consistent system operation and safety compliance in residential applications.

Engineered for direct replacement, the SP20303B integrates mechanical temperature regulation with gas valve control in a single unit. It is factory-calibrated to support ignition control and burner operation according to Rheem’s original specifications.

Product Highlights

• Model Number: SP20303B
• Application: Direct replacement for compatible Rheem natural gas water heaters
• Function: Controls water temperature and regulates gas supply to the main burner
• Connection: 1/2" NPT gas inlet
• Material: Corrosion-resistant metal housing for long-term durability

System Compatibility

• Use: Residential natural gas water heating systems
• Mounting: Matches factory configurations for designated models
• Fuel Type: Natural Gas
• Verification: Check unit data tag or service manual to confirm model match before installation

Installation Considerations

Installation of the SP20303B should be performed by licensed technicians familiar with gas control systems. Proper leak testing, pilot assembly connection, and adherence to code requirements are critical for safe and effective operation. Follow all Rheem guidelines and local code enforcement when installing or replacing this unit.

Contractor Notes

This control valve and thermostat assembly is intended for OEM service or warranty replacements. It ensures continuity in system performance when matched correctly and simplifies field maintenance due to its alignment with original factory specifications. Always verify part number compatibility before installation.