EG50-55 Boiler Section Assembly, Water or Steam, with Tankless Water Heater Opening, For EG50-55

Weil‑McLain 321‑811‑120 / 321‑811‑125 – Section Assembly for EG‑50/55 Series Boilers Enhance your rig’s heart with the Weil‑McLain EG‑50/55 section assembly—precision-engineered cast iron sections designed to seamlessly integrate with EG‑50 and EG‑55 atmospheric gas boilers. Available with or without a tankless-heater opening, these block assemblies support both water and steam applications and are intended for natural gas systems only weil-mclain.com plimptonhills.com +13 afsupply.com +13 ferguson.com +13 . Why It’s a Contractor’s Go-To: Heavy-Duty Cast Iron Sections: Facilitates durability and longevity under repeated thermal cycling . Dual Water/Steam Compatibility: Handles both hydronic and steam setups with ease weil-mclain.com +6 afsupply.com +6 weil-mclain.com +6 . Optional Tankless Heater Opening: The 321‑811‑120 includes it for applications requiring domestic hot water coils — the 321‑811‑125 omits it weil-mclain.com +9 weil-mclain.com +9 afsupply.com +9 . Made in USA & Support‑Ready: Full replacement sections faithfully match original dimensions and tolerances, easing field repairs weil-mclain.com +13 ecomfort.com +13 fwwebb.com +13 . Mixed-Series Coverage: Compatible with Series 1–5 EG and PEG models, ensuring future-proof flexibility weil-mclain.com +2 igate.northernplumbing.com +2 plimptonhills.com +2 . Key Specifications: Material: Cast iron block sections. Compatibility: EG‑50 / EG‑55 atmospheric boilers (Series 1–5). Purpose: Complete boiler block assembly, water/steam recommission, with/without tankless coil provision. Fuel Type: Natural gas only. Weight: Approximately 300 lb (with heater opening) or 450 lb (without) acwholesalers.com +12 afsupply.com +12 afsupply.com +12 weil-mclain.com +2 afsupply.com +2 weil-mclain.com +2 . Contractor Notes: Installation: Must be lifted and aligned carefully—lifecycle-tested joints must remain gas-tight. Refer to the official boiler manual to install insulation panels, burner drawer, draft hood, and seal faces per instructions weil-mclain.com +2 weil-mclain.com +2 weil-mclain.com +2 . Safety: Always confirm airtight installation. Follow venting instructions and comply with manufacturer torque specs to prevent spillage and ensure combustion safety . Professional Fit: Intended for licensed mechanical fitting—ensure code compliance for gas connections and thermal expansion path. Why It Works for You: Durable & Reliable: Cast iron sections built for long-term service cycles. Flexible Options: Choose heater opening based on your system needs. Serviceable Design: Compatible with full service channels and OEM parts. Efficient Performance: Supports high-efficiency assembly when paired with automatic vent dampers and proper piping weil-mclain.com +1 weil-mclain.com +1 weil-mclain.com +1 weil-mclain.com +1 weil-mclain.com +1 weil-mclain.com +1 .