Weil-McLain AB-155H AquaBalance Series 2 155,000 BTU Heat-Only Condensing Gas Boiler

Weil-McLain AB-155H AquaBalance Series 2 155,000 BTU Heat-Only Condensing Gas Boiler

Weil-McLain is a leading North American Brand of hydronic comfort heating systems for residential, commercial and institutional buildings, since 1881. Contractors, engineers, architects, homeowners, and facility managers alike rely on Weil-McLain boilers for their comfort heating needs. Installed in homes, offices, schools, restaurants, hotels, and other facilities throughout North America, the Weil-McLain brand is among the most trusted and often used in the building industry.

Features

• Compact design to increase placement options
• Heavy gauge insulated jacket provides quiet operation
• Contractor-friendly removable sides
• Pre-wired, plug-in ready electrical design
• Commercial grade 120V power 6' cord with 3 prong plug
• 24 VAC thermostat relay, fuse protected with prewired terminal strip
• Honeywell control with digital display
• Wall mounting bracket and hardware included
• Unique "3-in-1" vent adapter readily accepts PVC, CPVC, SS, or PP vent materials
• Multiple vent options includes direct vent, 2 pipes or concentric, through roof or sidewall
• Strategically placed sensors used instead of additional bulky boiler controls

What Our Experts Think

• High‑efficiency condensing heat: The Weil‑McLain AB‑155H AquaBalance Series 2 155,000 BTU Heat‑Only Condensing Gas Boiler delivers condensing efficiency that lowers fuel use and operating costs compared to traditional boilers while producing steady hydronic heat.

• Heat‑only focus: Designed specifically for space‑heating, this model is ideal when domestic hot water is provided by a separate water heater or indirect tank, simplifying system design.

• Quiet, dependable operation: Smooth combustion and robust controls deliver consistent temperatures and low noise during operation.

• Built for durability: Corrosion‑resistant heat exchangers and service‑friendly components promote long service life and easier maintenance for HVAC professionals.

Product Q&A

• What does “heat‑only” mean?
  It means the boiler is dedicated to space‑heating only — it does not provide domestic hot water. A separate water heater or indirect tank is required for DHW.

• What fuel does it use?
  Natural gas — a propane (LP) conversion kit is often available and must be installed by a licensed HVAC/gas technician if propane fuel is required.

• What systems does it support?
  Compatible with hydronic baseboards, radiant floor systems, and fan‑coil units tied into a hot‑water distribution loop.

• Is this high‑efficiency?
  Yes — condensing technology extracts extra heat from combustion gases, raising overall efficiency and lowering fuel cost over non‑condensing units.

Maintenance Tips

• Annual professional service: Have a licensed HVAC technician inspect and tune the boiler annually before the heating season — checking burner, heat exchanger, controls, and combustion performance.

• Check condensate drain: Ensure condensate lines and traps are clear and properly sloped to avoid blockages or freezing in cold weather.

• Monitor system pressure & expansion tank: Maintain correct boiler pressure and verify the expansion tank’s condition as recommended.

• Clean intake & exhaust openings: Keep air intake and vent terminations free of debris for safe, efficient airflow.

• Inspect for leaks: Regularly check valves, pipe fittings, and connection points for signs of water or gas leakage.

• Maintain water quality: Use recommended hydronic corrosion inhibitors and schedule periodic system flushing to reduce scale and extend component life.