Weil McLain 511-724-253 Thermocouple

The Weil McLain 511-724-253 Thermocouple is a task-specific 48-inch push-in thermocouple designed for high-performance flame sensing in residential gas boilers and standing pilot systems. Engineered as a genuine OEM replacement part, this 48" lead ensures reliable millivolt signal transmission to the gas valve, maintaining the safety loop in LP (Propane) and Natural Gas configurations. When troubleshooting a pilot that will not stay lit or a burner that fails to engage upon call for heat, this heavy-duty sensor is the standard specification for Weil McLain CGa, CG, and EG series boilers.

Constructed for the high-temperature environment of an atmospheric burner, the Weil McLain 511-724-253 features a universal push-in clip or bracket-mount design for rapid field replacement. The extended 48-inch length provides the necessary slack for proper routing around burner manifolds and through base assemblies without creating tension on the connection. For contractors maintaining hydronic systems, utilizing this factory-specified pilot burner thermocouple is essential for preventing nuisance lockouts and ensuring the structural integrity of the burner assembly is preserved during commissioning.

• Precise Millivolt Output: Delivers consistent voltage to the gas valve solenoid for reliable standing pilot domestic heating.
• Extended 48-Inch Reach: Ideal for larger boiler cabinets and specific manifold configurations requiring long-lead thermocouples.
• Direct OEM Fit: Eliminates the compatibility issues associated with universal kits in Weil McLain CGa and EG series applications.
• Robust Junction Design: Withstands high thermal cycling within the pilot flame to prevent premature sensor failure.
• Natural Gas & Propane Ready: Compatible with both fuel types when used with the appropriate pilot burner head.

• Will this fit a screw-in pilot burner? No, the 511-724-253 is a push-in thermocouple; check your pilot bracket to ensure it accepts a friction-fit or clip-style mounting rather than a threaded nut.
• Is the 48-inch length compatible with smaller CGa models? Yes, the 48-inch length is often specified to ensure enough reach for various cabinet sizes, and any excess lead can be safely coiled away from the burner.
• Does this work for both Propane and Natural Gas? Yes, the thermocouple itself detects heat and generates millivolts regardless of the gas type, though it is frequently specified in Weil McLain LP conversion kits.

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.