176,000 BTU Output Cast Iron Steam Boiler, EG-75, Spark Ignition - Series 6 (NG PIDN),No Tankless Opening

Weil-McLain EG-75 – Natural Gas Cast Iron Steam Boiler

The Weil-McLain EG-75 is a high-capacity atmospheric gas steam boiler designed for residential and light commercial applications. Built with cast iron sections and engineered for long-term service, this model delivers reliable steam performance with a net I=B=R rating of 529 square feet (176,000 BTU/hr steam output).

This unit includes critical safety features such as a factory-installed probe-type low water cut-off and is configured for single-pipe steam distribution systems. With straightforward piping connections and integrated components, the EG-75 provides dependable operation and ease of maintenance in new installations or system replacements.

Core Specifications

• Model: EG-75 (PN: 118754500)
• Steam Output: 176,000 BTU/hr
• Net I=B=R Rating: 529 Sq. Ft. EDR
• Fuel Type: Natural Gas
• AFUE Efficiency: 81%
• Ignition: Intermittent electronic ignition system
• Operating Pressure: Steam pressure limited to 15 PSI (ASME rating)

Design & Construction

• Heat Exchanger: Cast iron, sectional design
• Burner: Atmospheric gas burner
• Controls: Integrated control module with safety lockout
• Low Water Cut-Off: Included, factory-installed
• Vent Connection: 7-inch flue collar

Installation & Service Considerations

The EG-75 is floor-mounted and designed for vertical venting through an existing masonry chimney or approved B-vent. Piping layout should follow industry-standard practices for near-boiler steam header construction, with proper header sizing and riser placement to promote dry steam delivery.

This model ships assembled with trim installed and requires professional setup including main gas connection, electrical wiring to local code, and startup testing. Contractors should confirm clearance requirements for servicing and ensure combustion air supply is adequate per the installation manual.

Notable Features

• Cast iron sections designed for longevity and corrosion resistance
• Factory-assembled jacket with insulation to minimize standby losses
• Pre-installed pressure gauge, relief valve, sight glass, and drain
• Reliable performance under varying load conditions
• Meets DOE efficiency and safety requirements

Professional Use Only

This model is suitable for residential buildings with high steam demand or multi-unit dwellings using a single boiler system. Contractors should follow Weil-McLain’s EG-series piping diagrams and combustion setup instructions to ensure proper function and steam distribution.