EG-50 107,000 BTU Natural Gas PIDN Steam Boiler Package, No Tankless Opening

Weil‑McLain EG‑50 – 175 MBH Cast‑Iron Gas Steam/Hot Water Boiler with PIDN

The EG‑50 from Weil‑McLain, also known as the PIDN model 118504500, provides 175 MBH input and is approved for both steam and hydronic heating systems. It features a cast‑iron sectional heat exchanger with automatic vent damper, factory test-assembled pressure block, and intermittent electronic ignition. Efficiency reaches 84% AFUE for water service and 82% for steam, meeting industry expectations for reliability and energy performance :contentReference[oaicite:1]{index=1}.

⚙️ Core Specifications Fuel & Ignition: Natural‑gas, intermittent electronic pilot ignition (spark-to-pilot) Input Rating: 175 MBH (175,000 BTU/hr) DOE Output: 148 MBH (water); 145 MBH (steam) Net IBR Output: 129 MBH (water); 109 MBH (steam) AFUE: 84% water / 82% steam Vent Collar: 7″ diameter for chimney draft hood venting forum.heatinghelp.com +9 weil-mclain.com +9 oswaldsupply.com +9 afsupply.com +2 afsupply.com +2 ecomfort.com +2 ???? Engineering & Design Features Cast-Iron Sectional Block: Factory-assembled, includes insulated jacket and push-push nipples. Automatic Vent Damper: Factory-installed to reduce standby losses and improve overall efficiency unitedsupplyusa.com +4 weil-mclain.com +4 weil-mclain.com +4 forum.heatinghelp.com +9 weil-mclain.com +9 afsupply.com +9 . Service Access: Front-mounted burner tray and control compartment with external junction box. Steam Controls: Standard 15 PSI relief valves, pressuretrol, electrode-type low water cutoff, siphon, gauge glass and cocks hvacdiscounters.com +5 ecomfort.com +5 weil-mclain.com +5 afsupply.com +2 weil-mclain.com +2 afsupply.com +2 . Water-Only Controls: Includes 30 PSI relief valve, high-limit controls, 40 VA transformer, air separator oswaldsupply.com +8 weil-mclain.com +8 afsupply.com +8 . ???? Installation Guidelines Vent System: Requires masonry or lined chimney with proper draft hood alignment (minimum 7″ ID × 20′ height recommended) afsupply.com . Location: Must be installed on non-combustible flooring with combustion air per ANSI Z223.1 (minimum clearance: 34″ supply height, 1" side/back, 6" front) weil-mclain.com . Controls & Safety: Ensure wiring for ignition module, limit controls, low-water cutoff, and relief valves; factory jumper kit installed. ???? Service & Contractor Advantages Knockdown or Assembled Options: Ideal for jobs requiring tight mechanical room access. Full-Service Accessibility: Front access to burners, ignitera, controls, and jacket. Reliable Operation: Tested at 50 PSI, equipped for 15 PSI steam service; complete with spill switch and rollout protection. Field Actions: Optional left-end section for tankless coil or smart outdoor reset kit available (part #381-356-586). ✅ Conclusion The Weil‑McLain EG‑50 (118504500/PIDN) is a rugged, field‑proven steam or water boiler suited for mid-size hydronic systems. With its cast iron longevity, integrated vent damper, and drop‑in ignition system, it delivers reliable performance and ease of install and maintenance—making it an excellent choice for professional contractors tasked with delivering quality heating solutions.