EG-65 - 149,000 BTU Output Cast Iron Steam Boiler Package, Spark Ignition - Series 6 (NG PIDN), No Tankless Opening

Weil-McLain EG-65 Series 6 – 238 MBH Natural Gas Cast Iron Steam Boiler Package The Weil-McLain EG-65 Series 6 is a high-capacity, gas-fired steam boiler specifically engineered for consistent performance in residential and light commercial hydronic heating applications. This atmospheric, cast-iron boiler offers a dependable 149,000 BTU/hr net output (I=B=R) with a gross input of 238,000 BTU/hr. Rated at up to 84% AFUE, it is equipped with features that simplify field service, improve thermal efficiency, and ensure long operational life. Engineering Overview Model: EG-65 Series 6 Fuel: Natural Gas Net I=B=R Steam Output: 149,000 BTU/hr DOE Heating Capacity: 200,000 BTU/hr Input Rating: 238,000 BTU/hr Ignition System: Intermittent Electronic Ignition Vent Type: Natural draft, 7" flue Heat Exchanger: Cast iron, sectional block Efficiency: 84% AFUE (steam configuration) System Features Automatic Vent Damper Factory-installed to reduce standby losses by sealing the flue when the burner is not firing. Low Water Cut-Off (LWCO) Integral control for steam system safety, ensuring burner shutdown during low water conditions. Service-Friendly Design Accessible jacket panels, control compartment, and top-mounted draft hood simplify installation and maintenance tasks. Field-Tested Reliability Proven Series 6 platform with updated controls and safety systems for long-term service in demanding conditions. Recommended Use This model is optimized for gravity-return or pumped-return low-pressure steam systems. It supports one-pipe and two-pipe installations and can be configured with an optional tankless water heater opening (block-specific). Installation Guidelines Installation requires certified gas and plumbing professionals. Key site considerations include: Chimney sizing and draft verification Header and equalizer configuration per Weil-McLain recommendations Conformance with ASME Section IV and local mechanical code Proper vent damper wiring and testing per OEM manual Clearances must be maintained for jacket removal and top clearance for venting. Supply risers should use full tapping size to ensure steam quality. Summary The Weil-McLain EG-65 provides contractors with a workhorse steam boiler featuring: Heavy-duty cast iron construction AFUE-compliant energy performance Integrated safety and serviceability features ASME H-stamped heat exchanger with 15 PSI working pressure It is a reliable choice for replacement or new installations requiring mid-range steam capacity with legacy-compatible connections and proven longevity.