Heating and DHW System

Combination heating and DHW system using NPE-A Series condensing tankless water heaters


An add-on accessory for the Navien NPE-A Series tankless water heater that creates a high efficiency space heating and endless domestic hot water system

ComfortFlow System

* Compatible with NPE-A series units produced on or after May 31, 2014.
** Self-powered thermostats only.

Designed for both retrofit and new construction residential applications, Navien’s H2Air Kit* allows for space heating and DHW system integration between NPE-A Series tankless water heater models and a hydronic air handler. With H2Air you will have a combination appliance that can provide endless domestic hot water and continuous space heating when sized correctly.

H2Air is compatible with hydronic air handler models that require W1/W2/R terminals along with single or dual-stage thermostats†. The included Outdoor Reset Sensor provides optimum performance and efficiency for space heating.

Note: H2Air is for use with one NPE-A and one AHU only. For detailed information, refer to the AHU manufacturer’s literature to determine the proper output capacity.

Additional features of the H2Air System

  • Domestic hot water priority or simultaneous domestic hot water and heating.
  • Endless supply of DHW.
  • Adjustable outdoor temperature reset and heating set points.
  • Adjustable pump purge timer.

H₂Air™ Kit AHU Optimizer

H2Air Kit includes

  • Controller
  • 13-pin connector cable
  • Outdoor temperature sensor
  • Flow switch for domestic hot water

Optional Accessories

Plumb Easy Valve 3/4" with Relief Valve
Part Number: (30012581A)

Residential Neutralizer (1 unit)
Part Number: (GXXX001322)

Replacement Media

Part Number: (GXXX001323)

PeakFlowE™ Anti‑Scale System
Part Number: (GXXX001725)

CSA P.9-11 rating

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Product Serial number is 15-16 digits and can be found either on the right side of the box or the back of the front cover.
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