EcoTec 150-H 150Input MBtu 95% AFUE Gas Combi Condensing Heat Only Water Boiler Series 2

Weil-McLain ECO® Tec Heat-Only Condensing Boiler – Model 383900174

The Weil-McLain ECO® Tec 150 Heat-Only Boiler is a high-efficiency, wall-mounted, condensing unit designed for residential hydronic heating systems. Rated at 95% AFUE, it utilizes a stainless steel firetube heat exchanger and a full modulating burner for optimal fuel utilization and performance under varying load conditions. This model is suitable for single-zone and multi-zone systems and supports both natural gas and propane fuel sources (field convertible).

Core Engineering Features

• Heat Exchanger: 316L stainless steel, firetube configuration; corrosion-resistant and designed for high thermal efficiency and longevity.
• Burner Control: Full modulation with a 10:1 turndown ratio to reduce short cycling and enhance efficiency across diverse operating conditions.
• AFUE: 95%, ENERGY STAR® certified for low fuel consumption in high-efficiency applications.
• Combustion System: Sealed combustion chamber with low NOx emissions (<20 ppm), compliant with regional emissions regulations.
• Venting Options: Compatible with 2" or 3" PVC, CPVC, or polypropylene; supports direct venting up to 100 equivalent feet (varies by diameter and material).

Technical Specifications

• Model: ECO® Tec 150 Heat-Only (383900174)
• Input Capacity: 150,000 BTU/hr
• Output: 142,500 BTU/hr
• Net I=B=R: 124,000 BTU/hr
• Efficiency: 95% AFUE
• Fuel: Natural Gas or Liquid Propane (field convertible)
• Ignition: Direct spark ignition system
• Vent Size: 2” or 3” (dependent on vent run length)
• Control Interface: Capacitive touchscreen LCD with diagnostics, parameter setup, and fault history

Installation Considerations

The ECO® Tec 150 is intended for professional installation. Proper sizing, vent layout, system flushing, and pressure testing are essential. The boiler ships with integral wall bracket, mounting template, and factory-installed components including circulator, relief valve, air vent, and condensate trap. A licensed HVAC or plumbing contractor should ensure all work complies with local mechanical codes and manufacturer commissioning requirements.

Integrated Control Functions

• Outdoor Reset: Modulates supply water temperature based on external ambient conditions to improve energy efficiency and occupant comfort.
• DHW Integration (for combi models): Not applicable to this unit; combi performance (up to 5.4 GPM) is available in alternate ECO® Tec SKUs.
• Zone Compatibility: Interfaces with zone valves or zone circulators via onboard dry contact and pump control relays.

Certifications & Compliance

• ENERGY STAR® qualified
• ASME Section IV certified heat exchanger
• CSA Certified (ANSI Z21.13/CSA 4.9)
• Low NOx emissions compliant

Summary

The Weil-McLain ECO® Tec 150 Heat-Only Boiler is engineered for residential installations requiring high-efficiency heating in a compact, serviceable design. With its firetube heat exchanger, full modulation, and advanced touchscreen control, this boiler offers field flexibility, efficient performance, and long-term durability for modern closed-loop hydronic systems.