Weil McLain 383-500-407 Burner Replacement Kit

When you are troubleshooting an Ultra Gas Boiler that isn't maintaining a stable flame or is showing signs of combustion instability, the Weil McLain 383-500-407 Burner Replacement Kit is the specified OEM solution for Ultra 299 and Ultra 399 Series 1 and 2 units. This professional-grade kit is engineered to restore the precise fuel-to-air mixture required for high-efficiency condensing applications. As a genuine Weil McLain part, it ensures that the burner geometry and porting align perfectly with the original combustion chamber specifications. The assembly is field-versatile, designed for use with either Natural Gas or LP (Propane) configurations. By replacing the worn burner head, you eliminate common issues like hot spots, resonance, or delayed ignition that can lead to boiler heat exchanger damage. This burner manifold kit comes complete with a high-temperature burner gasket and all necessary boilder mounting hardware, ensuring a gas-tight seal and reliable operation during high-fire cycles.

• OEM Compatibility: Specifically designed for Weil McLain Ultra models 299 and 399 (Series 1 & 2), ensuring zero-clearance fitment.
• Dual Fuel Ready: Engineered for seamless performance with both natural gas burner and propane setups.
• Complete Service Kit: Includes the 383-500-407 burner, durable gaskets, and hardware to streamline field replacement.
• Combustion Precision: Restores factory-spec flame patterns for optimal thermal transfer and reduced emissions.
• Rigid Construction: Built to withstand the high-cycle thermal stress of modulate-condensing boiler operation.

• How do I know if the burner needs replacement? Look for signs of "flame lifting," visible cracking on the burner ports, or carbon buildup that persists after cleaning.
• Is this kit compatible with Series 3 Ultra boilers? No, the 383-500-407 is designated specifically for Series 1 and 2. Always verify your boiler's series before installation.
• Does this include the ignitor? This kit includes the burner, gasket, and hardware; secondary ignition components should be inspected and ordered separately if worn.

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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.