White-Rodgers 37C73U-170 Valve

The White-Rodgers 37C73U-170 is a heavy-duty natural gas water heater control valve designed to meet the rigorous demands of residential and light commercial applications. This unit features a 1-inch shank and is a direct replacement for Rheem AP14270G-1 and White-Rodgers 37C73U-836 models. Engineered with a temperature regulation range of 70°F to 160°F, it utilizes a 1/2-inch NPT inlet and a 1/2-inch inverted flare outlet for seamless integration into existing gas lines. The internal manifold pressure tap allows for precise field diagnostics, while the 4-inch W.C. main burner and 4.9-inch W.C. pilot pressure settings ensure stable combustion. Safety is managed through an integrated Energy Cut-Off (E.C.O.) high limit and an automatic safety shutoff for both the pilot and main burner, providing essential protection in the event of pilot failure. This CSA-certified gas water heater thermostat is a standard-setting component for technicians prioritizing reliability and exact pressure regulation in natural gas systems.

Key Benefits

• Universal Compatibility: Serves as a primary service replacement for common Rheem and A.O. Smith gas control configurations.
• Enhanced Safety: Built-in non-cycling E.C.O. prevents tank overheating by interrupting gas flow if temperatures exceed safe limits.
• Diagnostic Efficiency: The integrated manifold pressure tap simplifies the process of checking gas pressure during installation or troubleshooting.
• Debris Protection: Features a safe-lighting pilot cock with an internal filter to prevent orifice clogging and extend pilot assembly life.
• Robust Construction: Designed for high-performance natural gas water heaters with a durable 1" shank for a secure, leak-free mount.

Common Questions

What is the purpose of the 1-inch shank on this valve?
The shank length refers to the threaded portion that inserts into the water heater tank. A 1-inch shank is a standard size for many residential natural gas units, ensuring the sensing bulb reaches the correct depth for accurate temperature monitoring.

Can the 37C73U-170 be converted for use with Propane (LP)?
No. This valve is specifically calibrated for natural gas (NG). Using this control with liquid propane can lead to dangerous pressure levels and equipment failure; technicians must use the appropriate LP-rated replacement.

Does this gas control include the thermocouple?
This item is the gas control valve assembly only. While it features a 1/4-inch compression pilot connection and a standard thermocouple port, the pilot assembly and thermocouple are typically sold separately or salvaged from the existing burner kit.

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.