EG-75 - 180,000 BTU Output Cast Iron Water Boiler, Spark Ignition - Series 6 (NG PIDN), No Tankless Opening

Weil‑McLain EG‑75 (Model 118751500) – High‑Output Cast‑Iron Boiler Built for Reliability This versatile cast‑iron boiler delivers up to 282 MBH input for water or steam heating, engineered for both residential and light-commercial installations. With up to 84 % AFUE and an automatic vent damper, it prioritizes efficiency and operational economy oswaldsupply.com +13 afsupply.com +13 weil-mclain.com +13 . Durability & Design Highlights Cast‑iron heat exchanger designed for long life and thermal resilience acwholesalers.com . Stainless-steel burners coupled with a robust intermittent electronic ignition system and UCM diagnostic control module acwholesalers.com +8 afsupply.com +8 afsupply.com +8 . Automatic vent damper reduces heat loss and fuel use during standby cycles plimptonhills.com +8 afsupply.com +8 afsupply.com +8 . Serviceability Features Controls situated in exposed locations for easy servicing; Factory knockdown option simplifies shipping and installation; Designed to integrate optional tankless heater coils via a dedicated opening weil-mclain.com +15 weil-mclain.com +15 afsupply.com +15 . Technical Summary Spec Value Input (MBH) 282 MBH (approx. 299 MBTU) AFUE Up to 84 % Fuel Type Natural gas; propane optional Construction Cast iron exchanger, SS burners Ignition Intermittent electronic with diagnostics Applications Steam or hot water Venting Natural draft, includes damper Capacity Water DOE and Steam DOE ratings supported acwholesalers.com +8 weil-mclain.com +8 afsupply.com +8 weil-mclain.com +3 weil-mclain.com +3 weil-mclain.com +3 supplyhouse.com +3 weil-mclain.com +3 acwholesalers.com +3 Installation & Compliance Engineered for skilled installation, the EG‑75 requires proper gas connections, venting setup, and adherence to local standards. Coordination with licensed professionals ensures full performance and compliance. Contractor Insights This boiler is ideal when upgrading systems needing high heating capacity with solid efficiency. Its rugged cast‑iron build and service-friendly design make it a reliable asset on job sites. DIY Consideration Though the unit is robust and well-designed, installation complexity—particularly gas routing and venting—warrants hiring a seasoned HVAC/plumbing contractor for safety and proper commissioning