EVG 220 - 179,000 BTU Output Evergreen High Efficiency Condensing Gas Boiler (Natural Gas or Liquid Propane)

Weil-McLain Evergreen® 199 – High-Efficiency Modulating Condensing Gas Boiler (Model 383900000)

The Weil-McLain Evergreen® 199 is a floor-standing, modulating condensing boiler engineered for large residential and light commercial hydronic heating applications. Featuring a stainless steel fire tube heat exchanger and 10:1 modulation, this model provides a high turndown ratio for consistent load matching and reduced cycling, with a thermal input rating of 199,000 BTU/hr and an AFUE of 95%.

The Evergreen® series includes a factory-integrated control platform capable of operating as a single boiler or in a cascaded configuration with up to eight units. The 199 model supports direct venting, zone management, and field conversion between natural gas and propane.

Performance and Engineering Highlights

• Input Capacity: 199,000 BTU/hr
• DOE Heating Capacity: 184,000 BTU/hr
• Net I=B=R Rating: 160,000 BTU/hr
• AFUE: 95% (condensing, fully modulating)
• Fuel Type: Natural Gas or LP (field convertible)
• Heat Exchanger: 316L stainless steel, fire tube design
• Modulation Range: 10:1 turndown ratio
• Venting: Direct vent (PVC, CPVC, or polypropylene); up to 100 ft equivalent length

System Control and Integration

• ZoneStacking® Technology: Manages up to 24 heating zones using integrated control logic without external modules
• Multi-Boiler Cascade: Supports up to 8 boilers in a lead-lag configuration with automatic sequencing and redundancy
• Control Interface: High-resolution touchscreen with diagnostic readout, adjustable setpoints, DHW priority, outdoor reset, and multiple pump control relays
• Built-in Safeties: Flame safeguard, condensate monitoring, temperature and pressure protection, and ignition fault diagnostics

Installation Requirements

The Evergreen® 199 is designed for floor-mounted installation only and should be installed by licensed mechanical professionals. Proper vent sizing, condensate handling, and combustion air provision are required for code compliance and efficiency. Weil-McLain provides full technical documentation including wiring diagrams, venting parameters, commissioning instructions, and zone setup guides.

Integrated field wiring terminals and pre-piped internal components help streamline installation. The system is compatible with indirect-fired water heaters, buffer tanks, and third-party zone controllers when used outside the native platform.

Certifications and Standards

• ENERGY STAR® Qualified
• ANSI Z21.13 / CSA 4.9 certified
• ASME Section IV-stamped heat exchanger
• Low NOx (<20 ppm), compliant with applicable emissions standards

Application Scope

The Weil-McLain Evergreen® 199 is well-suited for installations requiring scalable hydronic capacity, integrated control logic, and long-term performance in residential or light commercial settings. Applications include zoned radiant heating, baseboard loop systems, indirect DHW integration, and projects requiring multi-boiler redundancy.