Combi Boiler

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Navien NCB-E

Navien NCB-E is the first high efficiency condensing combination boiler with the capacity to supply both heat and domestic hot water for larger homes — enough hydronic heat for a whole house, plus hot water to run two showers and a dishwasher all at the same time.

The Navien NCB-E saves installation time and reduces call backs. In addition, the NCB-E takes up 80% less space than a traditional floor standing boiler and tank water heater. Your customer now has more room, saves energy and enjoys all the hot water they need, whenever they want it.

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  • AFUE 95%
  • Dual inputs of up to 120k BTU/h for heating and 199k BTU/h for DHW
    Supplies all the heat and domestic hot water that most houses require.
  • 4.5 GPM@77° temperature rise for domestic hot water
    Separate stainless steel flat plate heat exchanger for DHW creates the highest flow rate for any combi-boiler in the industry.
  • Turn down ratio of 6:1 for heating and 11:1 for DHW
    The sophisticated gas flow control system provides a high turn down ratio, reducing energy waste and excessive boiler cycling and enhances temperature control for DHW.
  • Dual stainless steel heat exchangers
    Resist corrosion better than copper to provide longer life.
  • Field gas convertibility
    Dual venturi system allows for easy field convertibility from NG to LP operation. Orifice for LP conversion included.
  • PVC venting
    Low exhaust gas temperatures allows use of PVC, CPVC, ULC S636 and polypropylene vent systems, reducing installation time and costs. System can use 2" venting for up to 60', or up to 150' with 3" venting.
  • Low gas pressure operation
    Our negative pressure gas valve ensures maximum performance all the way down to a minimum gas pressure of 3.5" of water column.
  • Uses existing 1⁄2" gas piping
    Save time and effort in retrofit applications with 1⁄2" gas lines for up to 24'.
  • Space saving design
    Occupies 80% less space than a traditional floor standing boiler and tank water heater.
  • Linkability
    For extraordinarily large domestic hot water flow demand, the NCB can be cascaded with our NPE units.

Challenger Combination BoilerChallenger Combi

The Challenger Combination Boiler features a unique “Two in One” heat exchanger that provides both space heating and domestic hot water. The Challenger is not only energy efficient with an AFUE of 95%, but is efficient on space as well. As a combination boiler, the Challenger eliminates the need for a separate domestic hot water tank. The unique heat exchanger in the Challenger heats domestic hot water directly, allowing the boiler to condense in the DHW mode and eliminating a separate heat exchanger and three-way valve.

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  • Energy Efficiency with 94% AFUE
  • Condensing efficiency in both Space Heating and DHW modes
  • Low NOx – meets SCAQMD requirements
  • Dual core heat exchanger with glycol compatible copper waterways
  • Domestic hot water produced directly in the primary heat exchanger for lower maintenance
  • Advanced control with near 4:1 modulation and standard outdoor reset
  • Concentric venting standard on initial production (two-pipe PVC, CPVC, AL29-4C available in Q2, 2011)
  • Compact size for closet installation
  • Whisper-quiet operation