Description

Weil-McLain Ultra Series 4 155,000 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

High-efficiency condensing performance: The Weil-McLain Ultra Series 4 155,000 BTU Condensing Gas Boiler delivers up to ~95% AFUE, converting more fuel into usable heat and cutting energy costs compared to conventional boilers.

Powerful heat output: With 155,000 BTU/h capacity, it’s ideal for large homes, multi-family units, or light commercial spaces needing robust, reliable hydronic heat.

Quiet, smooth operation: Engineered for stable combustion and reduced noise, offering dependable comfort with minimal disruption.

Durable and service-friendly: Weil-McLain’s design emphasizes long-lasting components, corrosion resistance, and accessible service points — making maintenance easier for pros.

Product Q&A

What type of boiler is this?
A high-efficiency condensing gas boiler that uses advanced heat-recovery technology to extract extra heat from combustion gases before venting.

What heating systems does it support?
Works with hydronic baseboard, radiant floor, fan-coils, and chilled-water reheat systems where hot water heating is used.

What fuel does it use?
Natural gas (propane conversion kits are often available separately via qualified installers).

Does it require special venting?
Yes — condensing boilers use low-temperature PVC/CPVC or polypropylene venting due to cool exhaust temperatures.

Maintenance Tips

Annual HVAC inspection: Have a licensed technician service the boiler yearly — check heat exchanger, burner, controls, and combustion efficiency.

Check condensate drain: Keep the condensate line clear and flowing to avoid buildup or freeze issues.

Monitor system pressure: Maintain proper boiler pressure and make adjustments per the manufacturer’s guidance.

Clean air intake & vents: Remove debris around air inlet and exhaust terminations to ensure safe combustion.

Inspect for leaks: Periodically check around valves, pumps, and piping for water or gas leaks.

Maintain water quality: Use proper inhibitors and periodic flushing to keep the hydronic system clean and corrosion-free.

Weil-McLain Ultra Series 4 155,000 BTU Condensing Gas Boiler-Schneller Versand

Description