EG-40, 91,000 Output Cast Iron Steam Boiler, Spark Ignition - Series 6 (NG PIDN), With Tankless Opening

Weil‑McLain EG‑40 – 125 MBH Cast‑Iron Gas Boiler, 84 % AFUE (Water/Steam, Tankless Opening) The EG‑40 is a cast-iron sectional boiler with a 125 MBH input, delivering approximately 106 MBH net output in a water system (or 78 MBH for steam), and rated 84 % AFUE. It arrives knock-down for field assembly with a factory-feasible tankless coil port—ideal for installers planning tankless DHW integration weil-mclain.com +15 afsupply.com +15 afsupply.com +15 . ???? Core Contractor Features Rugged Cast-Iron Build Boiler sections rated for 50 PSIG, include built-in air separator, and come insulated with a vent damper-enhanced jacket to lower standby losses afsupply.com +1 afsupply.com +1 . Gas Ignition Assembly Equipped with intermittent electronic ignition, stainless-steel burners, combination gas valve, and a draft hood configured horizontal-to-vertical to eliminate traditional bulky chimney hoods weil-mclain.com +3 ussupply.com +3 weil-mclain.com +3 afsupply.com +8 afsupply.com +8 afsupply.com +8 . Servicing Accessibility Includes easy-access controls, electrical junction box, spill switch, rollout thermal fuse, and plug-in wiring for servicing convenience weil-mclain.com +2 afsupply.com +2 afsupply.com +2 . Flexible DHW Integration Built with a left-side opening for tankless-coil installation; piping for ½″ coil with easy access, supporting ~3 GPM at typical boiler temperatures ecomfort.com +2 homeperfect.com +2 ecomfort.com +2 homeperfect.com +15 weil-mclain.com +15 weil-mclain.com +15 . Water Boiler Safeties Comes standard with pressure-temperature gauge, 30 PSI ASME relief valve, high-limit control, and either integrated LWCO (for water versions) or universal control with diagnostic lights (if ordered with coil opening) ussupply.com afsupply.com +1 afsupply.com +1 . ???? Quick Specs Table Item Specification Input Rate 125 MBH Net Output (Water) ≈ 106 MBH Net Output (Steam) ≈ 78 MBH AFUE 84 % Pressure Rating 50 PSIG Vent Type Horizontal-to-vertical draft hood, 6″ chimney Ignition System Intermittent electronic Dimensions (approx.) 33¾″ H; 21″ W; 19″ D Weight ~505 lb ????️ Installation & Service Highlights Combustion Efficiency: Includes automatic vent damper to reduce standby fuel usage and improve efficiency afsupply.com +8 afsupply.com +8 ecomfort.com +8 weil-mclain.com . Service Efficiency: Front and top access panels, plus removable harness, reduce maintenance time. Retrofit-Friendly: Knock-down sections fit through 30″ doorways; rear or side tankless coil installations supported. Standard Venting Approach: Clearances and draft outlined in installation manual 550‑110‑639; guidance provided for chimney sizing and airflow. ???? Contractor Summary The EG‑40 offers a solid cast-iron design with high AFUE for hydronic or steam applications. It’s built with serviceability and flexibility in mind—optional tankless coil, draft collar, and standard water-side controls. Its rugged construction and built-in efficiency features make it a strong choice for long-term heating projects in residential and light commercial installations.