Rheem-Ruud SP20166D Gas Valve

The Rheem-Ruud SP20166D Gas Valve is an essential OEM service component designed for high-performance natural gas water heater repair. This combination gas control valve features a standard 1/2 inch NPT inlet and a 1/2 inch NPT outlet, factory-set for a 5.0 inch water column (WC) manifold pressure to ensure precise fuel regulation. Engineered for Robertshaw gas valve replacement applications, the SP20166D integrates a built-in high-limit energy cutoff (ECO) and a thermocouple connection to maintain system safety during the combustion cycle. This Rheem gas water heater part is built to withstand the rigorous demands of residential and light commercial plumbing environments, offering a direct-fit solution for technicians looking to restore pilot light stability and burner ignition in Rheem, Ruud, and Richmond water heaters. When performing a water heater thermostat replacement, this valve provides the necessary mechanical reliability and thermal sensing required for optimal recovery rates.

• OEM Compatibility: Precision-engineered as a direct Rheem-Ruud replacement part to ensure seamless fitment without pipe manifold modifications.
• Integrated Safety: Features a robust energy cutoff (ECO) switch that automatically shuts off gas flow if water temperatures exceed safe operating limits.
• Standardized Connections: Industry-standard 1/2" NPT threading allows for straightforward installation into existing gas lines and tank spuds.
• Accurate Pressure Regulation: Pre-calibrated to 5" WC Nat gas specifications for consistent burner performance and efficient combustion.

How do I troubleshoot a pilot that won't stay lit on an SP20166D valve?
Verify the thermocouple is fully seated and generating at least 20-30 millivolts. If the pilot flame is hitting the thermocouple but the valve won't engage, the internal electromagnet or the ECO circuit within the SP20166D may have failed.

Can the SP20166D be converted for use with Liquid Propane (LP)?
No, this specific model is calibrated for natural gas at 5.0" WC. Using natural gas valves in LP applications causes hazardous over-firing and is not supported by technical specifications.

What is the proper shank length for this gas control?
This valve typically features a standard 1-3/8 inch shank depth, designed to clear the insulation jacket on most standard Rheem residential water heaters.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.