Section Assembly Without Heater Opening, No Tankless Opening, EGH-115

Weil-McLain EGH-115 Gas-Fired Steam Boiler – High-Capacity Performance for Demanding Applications

The Weil-McLain EGH-115 is a commercial-grade, gas-fired steam boiler designed for high-capacity residential and light commercial applications. Part of the EGH Series, this unit delivers reliable steam heat with a robust cast-iron heat exchanger, field-proven design, and straightforward service access for efficient operation and long-term system integrity.

With a gross output of 387 MBH and a DOE heating capacity of 323 MBH, the EGH-115 is well-suited for large buildings requiring consistent steam output, such as multifamily residences, institutions, and commercial properties. The unit operates on natural gas and supports single-pipe and two-pipe steam systems.

Key Product Attributes

• Output Capacity: 323,000 BTU/hr DOE heating capacity; 387,000 BTU/hr gross input
• Boiler Type: Atmospheric draft, cast-iron sectional steam boiler
• Fuel: Natural gas (field-convertible to LP with optional kit)
• Ignition: Intermittent electronic ignition system with safety controls
• Vent Configuration: Chimney vent, Category I (atmospheric draft)
• Trim: Supplied with pressure gauge, pressuretrol, low water cutoff, and safety valve

Construction and Design Advantages

• Durable Sectional Block: Heavy-duty cast-iron construction enhances thermal retention and resists corrosion.
• Steam System Compatibility: Suited for single- or two-pipe steam distribution, making it adaptable to retrofit and new construction systems.
• Factory-Installed Components: Shipped with necessary steam trim and wiring connections to minimize onsite preparation time.
• Service Access: Front panel access to controls and burners for routine maintenance and diagnostics.

Installation & Code Considerations

The EGH-115 requires proper venting and combustion air provisions consistent with ASME and local mechanical codes. All gas connections, piping layout, and electrical work should be performed by a licensed mechanical contractor. Ensure adequate clearance for service access, combustion air supply, and flue gas ventilation. The unit includes 2-1/2" steam outlet tappings for main system connections.

Technical Summary

• Input: 387,000 BTU/hr
• DOE Capacity: 323,000 BTU/hr
• Net I=B=R Rating (Steam): 269,000 BTU/hr
• Combustion Type: Atmospheric
• Dimensions (HxWxD): Approx. 42" x 35" x 30" (varies slightly with trim and jacket)
• Gas Connection: 1-1/4”
• Water Tapping: 2-1/2”
• Flue Outlet: 9" diameter (Category I venting)

Application Use Cases

• High-output steam systems in multi-unit residential buildings
• Commercial facilities with legacy steam infrastructure
• Institutional heating requiring robust, field-serviceable steam generation