200,000 BTU Output Cast Iron Water Boiler, EG-55, Spark Ignition - Series 6 (NG PIDN), No Tankless Opening

EG-55 Cast Iron Water Boiler – Proven Efficiency and Heavy-Duty Performance

The Weil-McLain EG-55 is a cast iron sectional boiler designed for consistent and reliable hydronic heating performance in both residential and light commercial applications. This model is part of the EG series, known for its rugged build quality, high output, and service-friendly design. Operating on natural gas and utilizing spark ignition, the EG-55 delivers 200,000 BTU/hour output capacity and is engineered for long-term dependability in demanding environments.

The unit features a dependable cast iron heat exchanger and includes factory-installed components that support safety, efficiency, and code compliance. This includes an automatic vent damper and integrated low water cutoff. The EG-55 is configured for water systems but may be adapted for steam with appropriate modifications and components, making it a versatile option for various project requirements.

Key Mechanical Features

• Heat Exchanger: Cast iron, sectional design for durability and thermal retention
• Output Capacity: 200,000 BTU/hr (DOE heating capacity)
• Fuel: Natural Gas
• Ignition System: Intermittent spark ignition
• Control Package: Includes automatic vent damper and low water cutoff
• Application Type: Suitable for residential and light commercial hydronic systems

Installation Considerations

The EG-55 is designed for straightforward assembly and piping in field conditions. Sectional design allows for easier handling during setup. Installation must comply with local codes and should be performed by a qualified plumbing or HVAC professional. The included vent damper requires proper routing and electrical integration for safe operation. Access to a return-side connection and adequate clearance for servicing are essential.

Performance and Operational Highlights

• High Output Performance: Capable of supporting mid-to-large scale hydronic heating loops
• Fuel Efficiency: Engineered to optimize fuel usage via automatic damper and control logic
• Safety Features: Low water cutoff prevents operation during insufficient water levels
• Versatility: Can be adapted for either water or steam with correct trim and setup
• Service Access: Components designed for easy access during routine inspection and maintenance

Product Suitability

The EG-55 is well-suited for professionals specifying equipment for large residences, multi-unit buildings, or small commercial properties. Its cast iron construction provides thermal mass and resistance to wear, and the integrated safety devices support system longevity and regulatory compliance.