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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View BrochureECO Wall Mount Gas Boiler

Ultra Gas S3 CT Gas Boiler

Ultra S4 Gas Boiler

  • Cast aluminum coated heat exchanger
  • Up to 94% DOE AFUE efficiency
  • 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 you 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
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View Brochure Navien NFB Series and NHB Series

Navien NFB Series and NHB SeriesNavien NFB Series and NHB Series High Efficiency Condensing Boilers for Residential Applications

All Navien NFB and NHB boilers have Navien’s advanced burner system.
The industry’s largest turn down ratio means easier installation with
multiple zones while maintaining high operational efficiencies.

  • Much more energy efficient than old fashioned boiler systems
  • 95% AFUE recognized as Energy Star Most Efficient rating
  • Energy Star certified
  • Backed by the industry’s strongest warranty - 15 years limited on heat exchangers
  • Takes up about 80% less space than traditional floor standing boilers
  • Longer lasting than traditional floor standing boilers
  • Easy to use control panel
  • Elegant, clean appearance
  • Improves resale value
  • Ideal for replacements or new construction
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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.

condensing boiler