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High Efficiency Gas Hydro-Furnaces

Navien NPF hydro-furnace

Navien NPF high efficiency
provide consistent comfort while minimizing energy consumption

The NPF heats water by burning gas in a sealed combustion heat exchanger, completely isolated from the airstream. The heated water is then pumped through a hydronic heat exchanger that gently transfers the heat into the air. This unique method improves operational control, provides safe and even heating, and minimizes noise. By exposing the air to much lower temperatures than a conventional gas furnace, there is less of an impact on the conditioned air humidity level.

The Navien NPF hydro-furnace is 97% AFUE and; uses standard gas lines and ductwork, making it a smart, comfortable replacement for traditional forced-air furnaces.

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Heating air with warm water is so comfortable

NPF Hydro-furnace

diagram showing how a hydro furnace heats air
  • Durable stainless steel combustion heat exchanger located outside the airstream.
  • Hydronic coil transfers heat from the water into the conditioned airstream at temperatures up to 150ºF

Conventional furnace

diagram showing how a traditional gas furnace heats air
  • Gas combustion directly heats the conditioned airstream — exposing it to temperatures up to 1000ºF

Our unique hydronic forced-air heating design keeps combustion in a separate, fully enclosed compartment for safe and quiet comfort.

NPF Upflow & Horizontal hydro-furnaces

The NPF hydro-furnace leverages our advanced knowledge of tankless water heaters, combi boilers and boilers. We’ve modified this technology to reinvent forced air heating.

Navien offers two premium, high-efficiency hydro-furnace series: NPF Upflow and NPF Horizontal. Both gas, condensing forced-air furnace series are 97% AFUE and available in 60,000 BTU/h (9,000-60,000 capacity) and 100,000 BTU/h (14,000-100,000 capacity) sizes.

upflow and horizontal Navien NPF hydronic furnace models
  • Industry-leading variable capacity operation

  • Proven hydronic heat exchanger design

  • All models are 97% AFUE

  • Ultra-low NOx compliant

  • Vent with 2" or 3" PVC
  • Liquid propane and high-altitude conversion kits included

  • Full variable capacity operation using a one or two-stage thermostat

  • Industry-leading warranty

  • Direct readout self-diagnostics

Our innovative new design is a high-efficiency revolution in forced-air heating

All NPF hydronic furnace systems have Navien’s advanced stainless steel heat exchanger which helps maximize system efficiency and comfort. With 97% AFUE, the new NPF series is significantly more efficient than older forced-air furnace systems.

hydronic heating furnace control panel on front of unit
  • Industry-leading variable capacity operation from 15% to 100%
  • Continuously monitors air temperature & automatically adjusts capacity and airflow to maximize comfort & efficiency
  • Robust airflow is sustained up to 1.0” external static pressure for use with today’s high-efficiency high-static air filtration systems
  • Unique hydronic forced air heat exchanger design keeps combustion in a separate compartment outside of the heating air stream for quieter operation
  • Easily integrates with smart HVAC systems & home automation platforms
  • Dual-fuel compatible (gas or electric heating with heat pump) when matching with any AHRI-matched heat pump
  • When paired with an AC or HP system, the variable capacity blower can be customized for a comfortable, quiet cooling experience
  • Independent airflow for air conditioning, heat pump and fan-on settings provides year-round custom comfort


Warm up to the advantages of Navien hydro-furnace forced-air technology

The NPF hydro-furnace relies on Navien's unique heat exchanger and condensing technology to maximize system efficiency and comfort.

  • stainless steel heat exchanger for hydronic forced air furnace

    Proven heat exchanger design

    Stainless steel condensing heat exchanger saves energy and comes with a limited lifetime warranty.

  • variable speed blower motor for hydronic forced air furnace

    Variable speed blower motor

    ECM variable speed blower motor qualifies for most gas furnace efficiency incentives.

  • temperature chart showing more efficient temperature control of variable capacity furnace operation compared to staged

    Environmentally friendly design

    Every unit meets SCAQMD Ultra-low NOx requirements, minimizing potentially harmful emissions.

  • exhaust gas connection and venting installation detector on top of hydronic forced air furnace

    Low cost installation & multiple venting options

    High-efficient condensing technology allows for cost-saving PVC venting. Also, all models are equipped with a Vent Installation Detector (VID) for added safety during installation and maintenance.

  • smiling baby sleeping on back

    Low noise levels

    Unlike traditional forced air furnaces, the NPF hydro air heat exchanger design keeps combustion in a separate compartment outside of the heating air stream for quieter operation.

  • EZNav control panel for NPF hydro furnace

    Simple setup & troubleshooting

    EZNav control panel provides easy intuitive steps for startup & optional configurations. Self-diagnostics provide a direct readout in clear text, saved in non-volatile memory.

large home using hydro air heating for year-round temperature control


Enjoy high-efficiency heating wherever & whenever you need it

  • Variable capacity operation is like having many furnaces in one: low heat for milder days, high heat on colder days & more even temperatures year-round (compared to traditional single or two-stage furnaces)
  • More efficient zoning & temperature control
  • Models available for vertical (upflow) or horizontal flow, including attics & suspended installations
  • Primarily designed for residential home heating applications
  • Can also be used in non-industrial commercial applications such as schools, office buildings, churches, retail stores, nursing homes and hotels

Reduce Your Carbon Footprint with Navien’s Eco-Friendly Hydro-furnace

The NPF is designed with environmental sustainability in mind, boasting a 97% AFUE and Ultra Low NOx compliance. It qualifies for regional incentives, reduces energy bills, and enhances the efficiency of air conditioning and heat pump systems.

97% AFUE and ultra low NOx compliant hydro air heating system
Navien hydro-furnace installers in training

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