EcoTec 110-H 110 Input MBtu 95% AFUE Natural Gas Condensing Heat Only Water Boiler Series 2

Weil-McLain ECO® Tec 110 – Condensing Heat-Only Gas Boiler (Model 383900177)

The Weil-McLain ECO® Tec 110 is a high-efficiency, wall-mounted, modulating condensing boiler engineered for residential hot water heating systems. Operating at 95% AFUE, this model delivers consistent performance and thermal efficiency while occupying minimal wall space. It is field convertible from natural gas to propane and features a stainless steel firetube heat exchanger, integrated controls, and a user interface designed for simplified commissioning and diagnostics.

Performance & Design Highlights

• Rated Input: 110,000 BTU/hr
• Net I=B=R Rating: 96,000 BTU/hr
• AFUE: 95% (ENERGY STAR® Certified)
• Modulation Ratio: 10:1 turndown for optimal efficiency and reduced cycling
• Combustion System: Fully sealed, low-NOx compliant (<20 ppm)
• Fuel Type: Natural Gas (LP conversion kit included)
• Heat Exchanger: 316L stainless steel firetube; corrosion-resistant, high thermal transfer rate

Control Interface & Functionality

• Display: Capacitive color touchscreen with system diagnostics, parameter setup, and lockout history
• Outdoor Reset: Built-in sensor support for weather-responsive modulation
• Pump Control: Boiler and system pump logic with DHW priority (DHW function supported in combi model)
• Smart Sequencing: Supports load matching through dynamic modulation based on demand

Technical Specifications

• Model: ECO® Tec 110 Heat-Only
• Venting: Direct vent; compatible with 2” or 3” PVC, CPVC, or polypropylene; up to 100 equivalent feet
• Max Working Pressure: 50 PSI
• Relief Valve: ASME 30 PSI (factory-installed)
• Water Connection: 1" NPT
• Gas Connection: 3/4" NPT
• Dimensions (H × W × D): 30.5" × 16.5" × 14.17"

Installation & Service Notes

This unit is designed for professional installation. It ships with mounting hardware, condensate trap, 3-in-1 vent adapter, and pre-installed system components including air vent, pressure relief valve, and circulator. Startup requires combustion analysis and adjustment per manufacturer specifications.

The ECO® Tec is compatible with primary/secondary piping systems and zoning via valves or pumps. Integration with indirect-fired water heaters is supported through field-configurable settings (DHW tank and sensor not included in this model).

Certifications & Standards

• ENERGY STAR® listed
• CSA-certified to ANSI Z21.13 / CSA 4.9
• ASME Section IV “H” stamp heat exchanger
• Complies with SCAQMD Rule 1146.2 (Low NOx)

System Application

The ECO® Tec 110 is suited for residential hydronic systems that require compact, high-efficiency heat-only solutions. Ideal for baseboard, radiant, or panel radiator systems in new construction or retrofit projects, especially where venting flexibility and limited mechanical room space are concerns.