Rheem-Ruud SP20170A Control

The Rheem-Ruud SP20170A Natural Gas Combination Control is a critical direct replacement water heater gas valve designed for specific Rheem, Ruud, and Richmond residential units. This Robertshaw thermostatic control operates with a fixed pressure regulator set at 3.5" W.C., ensuring consistent burner manifold pressure for efficient combustion. This natural gas water heater control utilizes a standard 3/4" NPT inlet and a 1/2" NPT inverter outlet, making it compatible with various standing pilot ignition systems. Designed for precise temperature regulation, it features an integrated high-limit energy cut-off (ECO) to protect against overheating conditions. When diagnosing Rheem water heater gas valve problems, verify the millivolt output from the thermocouple to ensure the electromagnetic power unit properly holds the pilot flame. This robust gas water heater thermostat replacement is engineered for high-cycle reliability in residential hot water applications, maintaining tight tolerances for temperature differentials across varying flow rates.

Key Benefits

• Precise Pressure Regulation: Pre-set internal regulator maintains 3.5" W.C. natural gas manifold pressure for optimal burner performance.
• Integrated Safety System: Built-in ECO automatically interrupts gas flow if water temperatures exceed safe operating limits.
• Standardized Threading: Features a high-flow 3/4" inlet and 1/2" inverter outlet for seamless integration with existing piping and burner manifolds.
• Robertshaw Engineering: Leverages industry-standard thermal sensing technology for accurate water temperature maintenance.
• Direct Fit Compatibility: Specifically designed to replace OEM Rheem-Ruud controllers without the need for piping modifications.

Common Questions

Is the SP20170A compatible with LP (Propane) systems?
No, this control is factory-calibrated for natural gas only. Using this valve with liquid propane will lead to dangerous over-firing and equipment failure.

What should I check if the pilot will not stay lit on this control?
First, verify the thermocouple is fully seated and generating at least 20-30mV. If the millivolt signal is strong but the pilot drops, the internal power unit may be defective.

Does this valve include the temperature sensing probe?
Yes, the shank or "immersion probe" is an integral part of the control assembly and inserts directly into the water heater tank to monitor temperatures.

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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.