EG-65 - 149,000 BTU Output Cast Iron Water Boiler Package, Spark Ignition - Series 6 (NG PIDN), With Tankless Opening

Weil-McLain EG-65 Series 6 – 238 MBH Cast-Iron Water Boiler Package The Weil-McLain EG-65 cast-iron boiler delivers high-output performance and long-term reliability in a field-proven design. Rated at 238,000 BTU/hr input with an AFUE of up to 84%, it is ideal for mid- to large-scale hydronic heating systems in residential and light commercial buildings. Designed for hot water applications with the flexibility for steam configurations, the EG-65 meets rigorous efficiency requirements while maintaining ease of installation and service access. Application Highlights Net I=B=R Water Output: 149,000 BTU/hr Input Capacity: 238,000 BTU/hr Fuel Type: Natural Gas (Propane conversion kit optional) AFUE Efficiency: 84% (water systems) Boiler Type: Cast-iron sectional, natural draft Ignition: Intermittent Electronic with pilot Vent Connection: Chimney vent, 7" diameter Key Engineering Features Cast-Iron Heat Exchanger Constructed for durability with machined port connections, supporting longevity and resistance to thermal stress. Automatic Vent Damper Reduces standby losses and increases seasonal efficiency by sealing the flue when the burner is off. Service-Ready Design Top-mount draft hood, lift-off jacket panels, and accessible gas valve and controls reduce labor time during setup and service. Control Package Includes pressure or temperature controls, electronic ignition module, LWCO, and gas valve—factory assembled for consistent field performance. Installation Considerations This unit ships ready for natural gas and includes standard water trim. While installation is straightforward for licensed contractors, it does require: Proper chimney venting Compliance with ASME safety controls Field assembly of some external piping Knowledge of system zoning and circulator integration Professional installation is required to ensure full warranty validation and code compliance. Use Case Designed for high-demand residential and light commercial buildings requiring centralized water-based heating. Ideal for replacements in older systems that used gravity or standing-pilot boilers, offering a modernized, high-efficiency upgrade.