EG-40, 76,000 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 (Steam or Water) The EG‑40 is a heavy-duty, cast‑iron sectional boiler designed for both steam and hydronic heating systems. With a 125 MBH input and net outputs of approximately 106 MBH (water) or 78 MBH (steam), it maintains an 84% AFUE and accommodates an optional tankless coil opening—ideal for indirect domestic hot water integration. ferguson.com +12 weil-mclain.com +12 thegranitegroup.com +12 ???? Design Features for Contractors Rugged Cast-Iron Construction Rated for 50 PSIG, with integrated air separator and insulated steel casing to reduce standby losses. weil-mclain.com Efficiency-Boosting Auto Vent Damper Reduces heat loss during idle periods and pairs with intermittent electronic ignition for reliable startup. thegranitegroup.com +8 weil-mclain.com +8 oswaldsupply.com +8 Dual-Service Configuration Factory-configured for steam (15 PSI relief, LWCO, siphon, gauge cocks) or water (pressure/temperature gauge, relief valve, air eliminator), with plug-and-play wiring harness. ferguson.com +12 weil-mclain.com +12 afsupply.com +12 Service-Friendly Access Front-mounted inspection panels, plug-in controls, and accessible vent hood streamline maintenance. afsupply.com +1 ferguson.com +1 Optional Tankless Coil Integration Tankless coil opening available in panel for hydronic models—supports indirect hot-water systems without external tank. unitedsupplyusa.com +12 weil-mclain.com +12 afsupply.com +12 ???? Technical Snapshot Specification Rating / Detail Input Capacity 125 MBH Net Output (DOE) ~106 MBH (water), 78 MBH (steam) AFUE 84% Pressure Rating 50 PSIG Vent Size 6″ Inner Diameter x 20′ chimney + draft hood Ignition Intermittent Electronic Weight Approximately 505 lb Available Configuration Knock-down for water or steam, with/without tankless coil Warranty 20 yr exchanger (water), 10 yr (steam); 2 yr parts ???? Installation & Service Insights Draft Requirements: Designed for 6″ chimney; auto damper improves fuel consumption. weil-mclain.com ferguson.com +6 weil-mclain.com +6 unitedsupplyusa.com +6 afsupply.com +2 weil-mclain.com +2 afsupply.com +2 thegranitegroup.com +2 afsupply.com +2 afsupply.com +2 Steam vs. Water Setup: Steam versions include necessary gauges and safety controls; water models feature air eliminator and relief valve. Tankless Coil Prep: Water-version models with coil opening have pre-piped provisions—bolt-on coil accessible from left side. unitedsupplyusa.com +4 weil-mclain.com +4 afsupply.com +4 ✅ Contractor Takeaway The EG‑40 offers proven cast-iron durability with high performance in both steam and water systems. Its user-friendly service design, automatic damper, and coil integration make it a solid choice for residential or light-commercial projects. Ideal for contractors specifying reliable, long-lasting boilers with flexible installation options.