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

Weil-McLain EG-75 Gas-Fired Cast Iron Steam Boiler – 176 MBH

The **Weil-McLain EG-75** is a natural draft, gas-fired steam boiler built for residential and light commercial installations requiring high steam capacity and long-term performance. With a cast iron heat exchanger, 82% AFUE, and a DOE heating capacity of 176,000 BTU/hr, this unit is engineered for durability and efficiency in demanding hydronic applications.

Performance and Design

• Heat Exchanger: Cast iron sections with factory-installed push nipples for pressure-tight seals and optimal heat transfer.
• Steam Output: 176,000 BTU/hr DOE Heating Capacity; 141 MBH Net I=B=R Steam Rating.
• Combustion: Natural gas-fired with intermittent electronic ignition and standing pilot options available (field convertible).
• Vent Damper: Equipped with automatic vent damper to reduce off-cycle losses and improve seasonal efficiency.
• AFUE Rating: 82%

Boiler Configuration

• Boiler Type: Steam (single-pipe or two-pipe systems)
• Ignition: Spark ignition with safety lockout; upgradeable to electronic intermittent ignition.
• Flue Connection: 7-inch diameter for vertical draft chimney venting.
• Controls: Includes pressuretrol, low water cutoff, and gauge set; thermostat-ready.
• Maximum Allowable Working Pressure: 15 PSIG (steam)

Contractor-Focused Advantages

• Service Access: Front-mounted controls and top cleanout port simplify combustion chamber access for inspections and maintenance.
• Factory Assembly: Pre-assembled block, jacket, and controls reduce jobsite labor time.
• System Compatibility: Compatible with standard single-pipe and two-pipe steam distribution systems, making it suitable for retrofit or new installs.

Installation and Application Notes

This model is intended for closed-loop steam heating systems and must be installed with appropriate near-boiler piping to ensure proper condensate return and header height. Installation should be performed by a licensed mechanical contractor familiar with ASME and local code requirements for steam boilers. A minimum draft hood clearance, flue piping compliance, and correct pitch of steam mains are essential for proper operation.

Warranty and Compliance

• Heat Exchanger: 10-Year Limited Warranty
• Compliance: ASME Section IV certified, tagged for steam

Summary

The **Weil-McLain EG-75** is built for long service life in medium- to large-capacity residential steam systems. Its cast iron durability, reliable ignition, and factory-mounted components make it a preferred solution for professional contractors requiring dependable performance in steam heating applications. Ideal for upgrades, multi-unit housing, or light commercial properties.