From single-family homes to large-scale apartment complexes, the Weil-McLain name is synonymous with warmth and comfort. Our energy-efficient, high quality boilers can be designed to fit the tightest spaces, with boiler controls and zone controllers tailored to any size residential application.


S3 CT Gas Boiler installs by JD Indoor Comfort
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Ultra Gas S3 CT Gas Boiler

  • Up to 93.5% AFUE
  • Gas fired water boiler with cast aluminum heat exchanger
  • Venturi mixing body mixes air and gas providing higher efficiency
  • Designed to operate in low temperature condensing applications
  • Outdoor reset and domestic hot water priority standard
  • Negative regulated gas valve precisely delivers gas to the boiler
  • U-Control gives you the power for easy set-up and maintenance
  • Modulates with 5 to 1 turn-down ratio
  • Variable speed motor matches combustion output to heating needs
  • High grade stainless steel burner features quiet operation, high efficiency, and cleaner combustion for low NOx applications
97 CT Wall Mount Gas Boiler Products
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97+ CT Wall Mount Gas Boiler

  • 70,000, 110,000 & 155,000 BTU input models at 95% AFUE
  • Stylish, compact wall mount design for easy installation, service and maintenance
  • Unique condensing stainless steel fire tube heat exchanger design
  • Built-in boiler circulator
  • Built-in primary/secondary piping option
  • Pre-wired terminal strip for quick and easy electrical connections
  • Convenient indirect-fired water heater connection
  • Capable to vent with PVC, PP and SS up to 100′
  • Multi-color LCD display with text – no codes
  • CT – Condensing Technology – 5 to 1 turndown ratio
  • Aqua Logic indirect fired water heater compatible
Weil McLain ECO Boiler JD Indoor Comfort
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ECO Wall Mount Gas Boiler

  • Class-leading 70,000, 110,000, and 155,000 BTUH models
  • Exceeds Energy Star requirements at 95% AFUE efficiency rating
  • Durable stainless steel fire tube heat exchanger
  • Streamlined design configurable for installation
  • Display can be mounted on the boiler or wall (up to 2’ away)
  • Components positioned for fast and easy service
  • Multiple vent configurations and material options
  • Optional accessories to match virtually any installation
Weil-McLain Gas Boiler Products

CGa Series 2 Gas Boiler

  • Compact design saves valuable living space
  • Stainless steel burners for quieter ignition, longer life, and improved combustion
  • Gas fired water boiler with cast iron sections
  • Easily accessible controls, vertical flueways and top cleaning for easy and quick servicing
  • Up to 84% AFUE