EG-40, 91,000 Output Cast Iron Steam Boiler, Spark Ignition - Series 6 (NG PIDN), No Tankless Opening

Weil‑McLain EG‑40 – 125 MBH Cast‑Iron Steam/Hot Water Boiler (84% AFUE) The EG‑40 is a cast-iron gas boiler engineered for both steam and hydronic (hot water) systems. Offering up to 125 MBH input and approximately 106 MBH net DOE output in water mode (or 78 MBH for steam), it achieves 84% AFUE. Ideal for new installations or retrofits in residential and light-commercial settings. weil-mclain.com +15 weil-mclain.com +15 ecomfort.com +15 ???? Contractor-Focused Features Robust Cast‑Iron Heat Exchanger Supports pressures up to 50 PSIG; includes built-in air separator and pressure/temperature gauge for safe operation. afsupply.com +1 afsupply.com +1 Efficient Gas Ignition System Delivered with spark or intermittent electronic ignition, stainless burners, and automatic vent damper—all mounted under an insulated jacket. acwholesalers.com +12 weil-mclain.com +12 afsupply.com +12 Draft Hood & Venting Compact horizontal-to-vertical draft hood removes need for bulky chimney attachments; suited for standard chimney venting. oswaldsupply.com +11 acwholesalers.com +11 ecomfort.com +11 Serviceability Front access for burner, plug-in harness, and wiring box allow quick diagnostics and maintenance. oswaldsupply.com +15 weil-mclain.com +15 afsupply.com +15 Steam or Hot Water Versatility Model variants support both steam (82–84% AFUE, 78 MBH net) and hot water (~106 MBH net) applications; optional tankless coil available. weil-mclain.com +9 ecomfort.com +9 oswaldsupply.com +9 weil-mclain.com +12 afsupply.com +12 thegranitegroup.com +12 ???? Technical Summary Attribute Value Input Capacity 125 MBH (hot water) / 125 MBH (steam) Net Output (DOE) 106 MBH (water) / 78 MBH (steam) AFUE 84% (water) / ~83% (steam) Heat Exchanger Cast iron, 50 PSIG rating Ignition Spark or IEI, automatic vent damper Vent Size 6″ chimney, horizontal-vertical hood Accessories Air separator, relief valve, gauge Weight ~500 lb ???? Installation Tips Draft & Venting: Ensure chimney height and collar clearance are per NFPA 211. Automatic damper assists efficiency. Sizing for Load: Properly size based on steam or hot water system requirements to avoid short cycling or inefficiency. thegranitegroup.com afsupply.com +1 afsupply.com +1 acwholesalers.com +9 afsupply.com +9 oswaldsupply.com +9 thegranitegroup.com +5 acwholesalers.com +5 acwholesalers.com +5 Service Access: Open-front access allows burner removal/inspection without dismantling the unit. ???? Contractor Summary The EG‑40 is a heavy-duty, adaptable boiler suited for both steam and hydronic systems. Its solid cast-iron build, efficient ignition, and service-friendly features make it a reliable choice. With an insulated jacket and optional tankless coil, it’s ideal for contractors seeking long-term performance and versatile integration in tight mechanical rooms.