Rheem-Ruud SP10100B Thermopile

The Rheem-Ruud SP10100B is a high-output 23-inch thermopile engineered for millivolt gas control systems in residential and commercial water heaters and boilers. This critical OEM replacement part utilizes a series of interconnected thermocouples to convert thermal energy from the pilot flame into a DC electrical signal, typically ranging between 600mV and 800mV. This self-generated voltage provides the necessary power to operate the gas control valve and maintain main burner ignition without an external power source. Featuring a 3-inch bulb length and a 3/8-inch bulb diameter, the SP10100B thermopile ensures precise temperature monitoring and safety shutoff capabilities. Designed for direct compatibility with specialized Rheem, Ruud, and Richmond atmospheric gas units, this heavy-duty lead assembly is built to withstand high combustion chamber temperatures while preventing nuisance pilot outages. For field technicians, verifying the 7/16-28 well end fitting O.D. and the 23-inch overall length is essential for ensuring a secure, leak-free seat within the burner manifold assembly during installation.

• Universal Millivolt Compatibility: Precision-engineered to power standard millivolt gas valves in various Rheem-Ruud water heater models.
• Superior Thermal Response: High-quality sensing wire ensures rapid millivolt output to prevent unnecessary lockout cycles.
• Rugged Build Quality: Constructed with OEM specifications to resist oxidation and heat-related degradation in the combustion zone.
• Standardized Fitment: Features a standard 23-inch lead length and a 7/16-28 thread size for direct drop-in replacement.

• Why is my pilot light staying lit but the main burner won't ignite? This often indicates that the thermopile is not generating the minimum 350-400mV required under load to open the main gas valve. Test the generator leads with a multimeter while the pilot is active.
• Can I use the SP10100B for a 19-inch application? While the added length can be coiled safely, it is best practice to use the exact matching OEM part number to ensure the sensor bulb sits correctly in the pilot flame's "hottest" zone.
• Is this part compatible with electronic ignition systems? No, this is a millivolt thermopile specifically designed for standing pilot systems and will not function with hot surface or spark ignition controls.

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.