Weil-mclain 383-900-001 Evergreen Pro 299 Mbtu 95% Afue Natural Gas Condensing Water Boiler Direct Exhaust or Direct Vent

Product Description

The WEIL-MCLAIN 383-900-001 Evergreen Pro is a high-efficiency condensing water boiler designed for demanding commercial and residential heating applications. Rated at 299,000 BTU input and 95% AFUE, this natural gas boiler delivers reliable, cost-effective heat while minimizing fuel waste. It supports both direct exhaust and direct vent configurations, giving installers flexibility on the job site. The stainless steel fire tube heat exchanger with a non-metallic base resists corrosion and extends service life, making it a dependable choice for HVAC professionals who need long-term performance. The unit is floor standing as standard, with an optional wall mount kit available for 220 to 399 MBH sizes, so it adapts to a wide range of mechanical room layouts. As a modulating condensing boiler, it adjusts its firing rate to match the actual heating load, reducing short cycling and improving overall system efficiency. The Evergreen Pro supports up to 8 boilers in a multiple boiler control setup with lead and lag rotation, making it suitable for larger buildings or facilities that need staged heating capacity. Four pump and auxiliary outputs allow flexible system design, such as one boiler loop pump plus three zone pumps. Each input can be assigned to one of up to three priorities, and multiple inputs can share a single priority for zone-based control. Modbus connectivity enables integration with building management systems, and a 0 to 10 volt input supports modulation or set point control. The configurable auxiliary input and output system gives technicians precise control over system behavior. This boiler is part of a five-size product family ranging from 110 to 399 MBH, so the right capacity is available for almost any project. At 260 pounds, the unit is substantial but manageable for a professional installation crew. Dimensions are 45 inches tall, 24 inches in length, and 22 and three-quarter inches wide.

• Stainless steel fire tube heat exchanger with non-metallic base for corrosion resistance and long service life
• Supports up to 8-boiler multiple boiler control with lead and lag rotation for large-scale heating systems
• Modbus to BMS connectivity plus 0 to 10 volt input for advanced building management integration

Product Highlights

The Weil-McLain 383-900-001 Evergreen Pro 299 MBtu condensing boiler combines 95% AFUE efficiency with flexible venting, advanced multi-boiler control, and robust stainless steel construction, making it a strong choice for HVAC professionals installing or replacing high-efficiency hydronic heating systems.

Product Information

Standard Information

• Brand: WEIL-MCLAIN
• Manufacturer Part Number: 383-900-001

Technical Specifications

• Series: Evergreen Pro
• Item Type: Boiler
• BTU Input: 299,000
• AFUE: 95%
• Fuel Type: Natural Gas
• Venting: Direct Exhaust or Direct Vent
• Weight: 260 pounds
• Height: 45 inches
• Length: 24 inches
• Width: 22 and three-quarter inches
• UPC / GTIN: 672619203549