Weil McLain 510-811-938 Conversion Kit

The Weil McLain 510-811-938 conversion kit is a field-critical assembly engineered to safely transition a heating system from natural gas to liquid propane (LP). As a technician, you know that propane’s higher BTU content—approximately 2,500 BTU/ft³ versus 1,000 BTU/ft³ for natural gas—requires precise air-to-fuel ratios to prevent soot buildup or heat exchanger damage. This LP conversion kit includes a dedicated gas valve, exact-tolerance burner orifices, and a pilot assembly with tubing to maintain flame stability under high-pressure LP conditions. The package also features a temperature sensor wire harness and a module to ensure the control logic aligns with propane combustion parameters. Properly swapping the burner with pilot bracket and applying the included labels is mandatory for code compliance and safe manifold pressure adjustment. Using this Weil McLain 510-811-938 OEM hardware ensures the boiler fuel conversion meets factory specifications for peak thermal efficiency and long-term reliability on the job site.

• Precise Fuel Regulation: Includes a high-grade gas valve and calibrated orifices to handle the specific energetic demands of liquid propane.
• Complete Component Integration: Features a burner with pilot bracket and pilot assembly with tubing designed for seamless mechanical fitment in the combustion chamber.
• System Control Synchronization: The included module and temperature sensor wire harness update the boiler's electrical logic for propane-specific firing rates.
• Full Installation Hardware: Comes with a bushing-3/4" x 1/2" NPT, necessary hardware, and instructions to streamline the natural gas to propane conversion.

Can I reuse the existing natural gas orifices for an LP conversion?
No. Propane requires smaller orifice diameters due to its higher energy density and delivery pressure. Reusing natural gas orifices will cause over-firing and potentially hazardous combustion conditions.

Is the gas valve in this kit different from the standard natural gas valve?
Yes. The gas valve provided in the Weil McLain 510-811-938 kit is specifically calibrated for the spring tension and flow characteristics required for liquid propane regulation.

Why are the included labels important for the conversion process?
The labels are a critical safety and code requirement. They notify future technicians that the equipment has been modified for LP fuel, ensuring they use the correct testing equipment and replacement parts during service.

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.