EG-45 110,000 BTU Natural Gas Water Boiler, With Tankless Opening

Weil‑McLain EG‑45 – 150 MBH Cast‑Iron Water Boiler, 84 % AFUE The EG‑45 is a rugged, sectional cast‑iron boiler designed for hydronic (water) heating service. With a 150 MBH input and approximately 124 MBH net IBR rating for water systems, it delivers solid performance and up to 84% DOE AFUE efficiency. The unit also includes a knock‑down (disassembled) left‑end opening ready to accept an optional internal tankless hot‑water heater coil boilersupplies.com +12 afsupply.com +12 afsupply.com +12 . ???? Key Contractor-Level Features Durable Cast‑Iron Construction Sectional cast‑iron block rated for 50 PSIG, wrapped in an insulated jacket with a horizontal‑to‑vertical draft hood. afsupply.com +1 afsupply.com +1 Fuel‑Saving Auto Vent Damper Includes a built-in vent damper to reduce heat losses when not firing—standard on EG‑45. boilersupplies.com +12 afsupply.com +12 afsupply.com +12 Intermittent Electronic Ignition Stainless burners with intermittent ignition and a combination gas valve ensure reliable starts and clean combustion. homeperfect.com +11 afsupply.com +11 plimptonhills.com +11 Service-Friendly Access Front-access control panel, plug-in wiring harness, rollout thermal fuse, and spill switch make maintenance and diagnostics efficient weil-mclain.com +6 afsupply.com +6 plimptonhills.com +6 . Collision of Water/Steam Capabilities Primed for steam or water applications. Water version features air separator, 30 PSI relief valve, combo gauge, high-limit control, and low-water cutoff boilersupplies.com +4 plimptonhills.com +4 weil-mclain.com +4 oswaldsupply.com +3 afsupply.com +3 afsupply.com +3 . Tankless Hot-Water Coil Ready Knock-down left-end with opening for internal tankless coil—ideal for indirect domestic hot water applications. Must be ordered with coil kit. reddit.com +3 afsupply.com +3 weil-mclain.com +3 ???? Contractor’s Spec Table Specification Details Input Capacity 150 MBH Net Output (Water, MBH) ~124 MBH AFUE 84% Pressure Rating 50 PSIG Vent Size 6″ ID chimney x 20′ minimum Ignition & Controls Intermittent × electronic, plug-in module Jacket & Draft Hood Insulated steel jacket & vertical hood Service Weight ~505 lb Warranty Water: 20 yr exchanger &, 2 yr parts ???? Installation Notes Vent Requirements: Requires 6″ chimney; automatic damper aids efficiency. weil-mclain.com +1 weil-mclain.com +1 boilersupplies.com +5 afsupply.com +5 plimptonhills.com +5 Ignition Protocol: Must be used with natural gas; no propane conversion option. ussupply.com +13 afsupply.com +13 weil-mclain.com +13 Tankless Coil Access: Coil opening installed at factory; coil kit required separately. ecomfort.com +11 ussupply.com +11 homeperfect.com +11 ✅ Summary for Contractors The EG‑45 cleanly blends time-tested cast‑iron longevity with modern efficiency and service ease. Automatic venting and electronic ignition reduce fuel waste, while plug‑in controls, coil readiness, and flexible fuel options make it adaptable on-site. Robust 150 MBH capacity suits mid‑to‑large residential or light commercial jobs, and the sectional design fits through 30″ openings when assembled on-site.