EG-40-45, Block Section Assembly, Steam, 125,000 BTU

Weil-McLain Section Assembly – EG & PEG 40/45 Series

The Weil-McLain 321811115 is a cast iron section assembly designed for use with EG-40, PEG-40, EG-45, and PEG-45 steam and hot water boiler models. This OEM component is a critical part of the sectional heat exchanger system, ensuring pressure integrity, thermal efficiency, and compatibility with Weil-McLain’s Series EG/PEG block-style boilers.

This section is manufactured to maintain the original performance characteristics of the boiler, restoring proper operation after damage or deterioration of the core. It’s designed for field assembly using Weil-McLain-specified push nipples and sealing methods, allowing certified technicians to rebuild or expand an existing heat exchanger block without compromising system performance.

Core Specifications

• Part Number: 321811115
• Application: EG-40, PEG-40, EG-45, PEG-45
• Material: Precision-machined cast iron
• BTU (per EG-45 rating): Up to 125,000 BTU (input)
• System Compatibility: Steam or hot water (depending on configuration)

Design Features

• Cast to exact Weil-McLain tolerances for thermal expansion compatibility
• Push-nipple design ensures watertight, gasketless sealing between sections
• Supports flueway geometry for consistent combustion gas flow
• Meets original equipment efficiency and pressure drop specifications
• Machined and tapped for OEM jacket and piping attachments

Installation Considerations

Section replacement or assembly should only be performed by certified technicians familiar with Weil-McLain block construction procedures. Proper torque sequencing, nipple insertion depth, and sealing alignment are required to ensure longevity and structural integrity. Installation must comply with ASME code requirements for low-pressure boilers.

Professional Use Case

This section is intended for restoring or expanding EG/PEG 40–45 boiler models in residential and light commercial settings. It’s particularly relevant for long-term maintenance contracts where retaining system compatibility and performance is critical. As a field-assembled boiler section, this part allows reconfiguration of damaged boilers without full unit replacement.

Summary

The 321811115 Weil-McLain section assembly provides a direct-replacement option for EG and PEG Series 40 and 45 boilers. With factory-verified material integrity and precise cast dimensions, it maintains rated performance across both hydronic and steam applications. For contractors tasked with long-term boiler service and restoration, this OEM part is essential for field rebuilds that meet original system specifications.