Weil McLain 383-500-085 Burner Replacement Kit

The Weil McLain 383-500-085 Burner Replacement Kit is a critical service component for maintaining the combustion efficiency of Ultra Gas Boiler models, specifically engineered for the Ultra 155 Series 1 and 2. As a veteran-grade OEM boiler part, this kit addresses common combustion issues such as burner degradation, inconsistent flame signals, and carbon buildup that can lead to lockout codes. This boiler burner assembly is compatible with both natural gas and propane (LP) configurations, providing the versatility required for diverse field applications. When performing an annual teardown or a burner tube repair, replacing the entire assembly ensures the venturi and burner mesh maintain the precise air-to-gas ratio necessary for high-condensing performance. The high-temperature burner gasket included in this Weil McLain Ultra service kit prevents flue gas bypass, protecting the heat exchanger and surrounding components from thermal stress and localized overheating. This complete gas boiler maintenance part is the standard for technicians who prioritize reliable ignition and long-term system stability over temporary fixes.

• Includes genuine OEM components: burner, professional-grade gasket, and all necessary mounting hardware for a complete swap.
• Optimized for Weil McLain Ultra 155 units, ensuring a perfect fit and preventing the combustion leaks often associated with aftermarket alternatives.
• Engineered to handle both Natural Gas and Liquid Propane fuel sources without additional modifications.
• Designed specifically for Series 1 and Series 2 heat exchangers to restore factory-spec flame patterns.

Is this kit compatible with Ultra Series 3 or 4 boilers?
This specific part is dimensionally and technically tuned for Ultra Series 1 and 2 (Size 155). For later series, verify the specific part number as burner designs were updated for different heat exchanger geometries.

Do I need to replace the gasket during every burner inspection?
Yes. The burner gasket is a single-use fiber component. Reusing an old gasket often leads to air leaks, which disrupts the flame sensor signal and can cause premature ignition failure.

Can this burner be used for both NG and LP boilers?
Yes, the 383-500-085 is designed to function with either fuel type, provided the boiler’s gas valve and orifices are correctly configured by a licensed professional.

This item is not eligible for free shipping.

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.