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Condensing Water Boilers



Natural Gas/LP, Condensing, Hot Water Boilers

A hot water boiler is an appliance used to heat water for a hydronic heating system. The hot water is distributed through the home in pipes into the rooms with either a steel radiator (newer homes) or cast iron radiator (older homes) or baseboard convectors or "fin-tube"(newer homes). Once the radiator or baseboard fin-tube convector is heated with the hot water, the water is returned back to the boiler to be re-heated and the water circulation loop continues.

Condensing Hot Water Boilers are the most advanced and efficient type of boilers. They do not use a traditional chimney to exhaust combustion gases, instead using a two pipe, PVC direct vent system that brings in fresh air from outside for combustion and exhausts the combustion gases out through a second pipe. This type of venting is usually done through a side wall and not through the existing chimney.

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Class-leading 70,000, 110,000, and 155,000 BTUH models

ECO Wall Mount Gas BoilerECO Wall Mount Gas Boiler

  • 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

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Ultra Gas S3 CT Gas Boiler

Ultra Gas S3 CT Gas Boiler

Since it’s unveiling in 2002, the ultra condensing boiler has set the industry standard for innovation, design, ease of installation, reliability and efficiency. Now, Weil-McLain is taking the industry standard to a new level with the introduction of the Ultra Series 3. The Ultra Series 3 delivers peace of mind, unmatched comfort, and immediate payback in energy savings for homeowners. 

  • 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

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WM97+ CT Wall Mount Gas BoilerWM97+ 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

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When upgrading to a condensing boiler it is usually a good idea to incorporate an indirect water heater or to install a new direct vent water heater so as not to “orphan” a chimney vented water alone in a chimney it will not vent properly through.