Weil-McLain Ultra Series 4 230,000 BTU 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
- Cast aluminum coated heat exchanger
- Designed to operate in low temperature condensing applications
- Outdoor reset and domestic hot water priority
- Modulates with 5:1 turn-down ratio
- High grade stainless steel burner features quiet operation
- U-Control gives the power for easy set-up and maintenance
- Multiple set-up and zone options
- System sensing recognizes system and outdoor temperatures
- Temperature management for up to three different set-points
- Control multiple boilers from a single control panel
- Standard screen messages provide service alerts and maintenance reminders
What Our Experts Think
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High-efficiency condensing heat: The Weil-McLain Ultra Series 4 230,000 BTU Condensing Gas Boiler delivers top-tier fuel efficiency (up to around 95% AFUE) by capturing extra heat from exhaust gases β lowering fuel costs and carbon footprint.
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Robust heating capacity: With 230,000 BTU/h output, itβs ideal for large homes, multifamily units, or commercial spaces that need strong, reliable hydronic heat.
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Smooth, quiet operation: Advanced burner and heat transfer design help reduce operational noise and provide even temperature control.
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Durable construction & serviceability: Built with a corrosion-resistant heat exchanger and accessible service points, making maintenance easier and extending service life.
Product Q&A
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What type of boiler is this?
A high-efficiency condensing gas boiler that uses a secondary heat exchanger to squeeze extra energy from combustion exhaust.
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Where is it best used?
Best for large residential properties, multifamily buildings, schools, and light commercial heating systems.
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What distribution systems does it support?
Works with hydronic baseboards, radiant floor systems, fan coils, and other hot-water loops.
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What fuel does it use?
Natural gas (qualified HVAC techs can install a propane conversion kit if needed).
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Does it require special venting?
Yes β condensing boilers typically use PVC, CPVC, or polypropylene venting due to cooler flue gas temperatures and condensate handling.
Maintenance Tips
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Annual professional service: Have a licensed HVAC technician inspect and tune the boiler each year before heating season β focusing on the burner, heat exchanger, controls, and combustion.
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Check condensate drain: Ensure condensate lines remain clear and draining properly to prevent clogs or freezing.
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Monitor system pressure: Maintain proper boiler pressure and check expansion tank condition as needed.
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Clean intake and exhaust terminations: Keep air inlets and vent terminations free of debris to ensure safe combustion airflow.
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Inspect for leaks: Check around valves, fittings, and piping periodically for signs of water or gas leaks.
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Maintain water quality: Use proper corrosion inhibitors and periodic system flushing to protect internal components and improve longevity.
Damage 
Loss 
Theft 
