Weil-McLain 383-500-775 Heat Exchanger Replacement Kit for Ultra 155 Boiler

The Weil-McLain 383-500-775 is a genuine OEM heat exchanger block replacement kit designed specifically for Ultra 155 gas-fired water boilers. This kit is compatible with all Ultra 155 series versions including S1, S2, S3, and S4 models, providing a comprehensive solution for restoring boiler performance.

Important Product Notes:

• This updated kit replaces the previous part number 383-500-673
• Kit no longer includes the cover plate (383-500-395) or burner replacement (383-500-085), which must be ordered separately if needed
• Designed for Weil-McLain Ultra 155 condensing boilers with cast aluminum heat exchanger design
• Genuine Weil-McLain replacement part ensuring proper fit and compatibility

Application:

• Compatible with Ultra 155 Series 1, 2, 3, and 4 boilers
• For use with natural gas and LP gas-fired water boilers
• Suitable for high-efficiency condensing boiler applications

This heat exchanger replacement kit includes essential components, gaskets, fittings, and hardware necessary for installation. Professional installation by a licensed HVAC technician is required. Refer to the manufacturer's installation instructions for complete component list and detailed installation procedures.