Weil McLain 383-500-035 Blower Assembly Kit

This Weil McLain 383-500-035 Blower Assembly Kit is the direct OEM replacement engineered specifically for Ultra-155 Series Gas Boilers. As a technician, you know that maintaining precise combustion airflow is critical for the Ultra 155 gas boiler to operate at peak efficiency and avoid lockout codes. This replacement blower assembly eliminates the guesswork of sourcing individual components by providing a drop-in solution that handles both the air-gas mixing and forced induction necessary for the heat exchanger. The kit includes the high-performance blower motor, a pre-cut boiler blower gasket, and all required mounting hardware to ensure an airtight seal against the venturi and burner housing. When the existing motor starts pulling high amps or showing bearing wear, this Weil McLain 383500035 kit allows for a fast, reliable swap that restores factory-spec modulation. Designed for Ultra 155 Series 1 and 2 units, it is built to withstand the thermal demands of high-efficiency hydronic systems while ensuring consistent boiler blower motor performance across the full firing range.

Key Benefits

• Verified Compatibility: Purpose-built for Weil McLain Ultra-155 models to ensure exact electrical and mechanical fit.
• Complete Assembly: Includes a fresh blower gasket and mounting hardware, reducing service time and preventing gas leaks.
• OEM Reliability: Genuine Weil McLain part prevents the common vibration and airflow issues found in universal aftermarket alternatives.
• Restored Efficiency: Corrects combustion air ratios to maintain the low-NOx performance and fuel economy of the condensing boiler.

Common Questions

Does this kit work for the Ultra 230 or other sizes?
No, this specific assembly is optimized for the fan curve and static pressure requirements of the Ultra 155. For the Ultra 230, you must use part number 383-500-040.

Are the gaskets included or sold separately?
The gasket is included in this Blower Assembly Kit. Replacing the gasket during every blower service is a standard best practice to prevent carbon monoxide leakage and maintain combustion integrity.

Is this compatible with both Series 1 and Series 2 boilers?
Yes, the 383-500-035 serves as the standard replacement for Ultra-155 Series 1 and Series 2 gas-fired boilers.

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.