White-Rodgers 37C73U-173 Valve

The White-Rodgers 37C73U-173 is a universal gas water heater valve designed for natural gas applications, providing a reliable field replacement for various OEM controls. This direct-acting thermostatic valve features a precise temperature adjustment range from 70°F to 160°F (21°C to 71°C) and utilizes a 1.25-inch shank for standard tank installation. Engineered with a built-in ECO (Energy Cut-Off) and a regulated pilot flow, it ensures consistent burner performance and thermal safety. The unit incorporates a thermopile-powered gas control system, eliminating the need for external electricity by utilizing a millivolt signal. For contractors, the White-Rodgers 37C series facilitates faster service calls due to its standardized 1/2-inch NPT inlet and outlet connections and consistent 1.25sk mounting specification. This gas control valve is a robust choice for maintaining specific water temperatures while providing dependable pilot ignition and main burner regulation in residential tanks.

• Universal Compatibility: Replaces common White-Rodgers 37C and competitive models used in standard natural gas tanks.
• High-Accuracy Sensing: Integrated immersion sensor ensures responsive temperature regulation and prevents overheating.
• Contractor-Grade Durability: Solid body construction with a multi-position knob for Off-Pilot-On settings and precise setpoints.
• Self-Powered Operation: Works via millivolt thermopile generated power, ensuring functionality during power outages.

Frequently Asked Questions

How do I troubleshoot a pilot that will not stay lit on the 37C73U-173?
Verify the thermopile is generating at least 325-750 millivolts and check for proper pilot gas pressure. Ensure the ECO connection is secure and not tripped.

Can this valve be used for LP (Liquid Propane) conversions?
No, this specific model is calibrated for natural gas only. Mixing fuel types can lead to hazardous operating conditions and burner failure.

What is the purpose of the 1.25sk shank length?
The 1.25-inch shank is the insertion depth for the temperature sensing probe into the water tank, standard for most residential 30 to 50-gallon water heaters.

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.