The Navien NDF Series is a 96% AFUE condensing gas furnace built for dependable forced-air heating, quiet operation and installation flexibility. Two-stage heating, a variable-speed ECM blower, 4-way multi-position installation and five models ranging from 52,000 to 105,000 BTU/h input help contractors match the furnace to a wide range of home layouts and heating requirements.
The NDF Series gives homeowners the advantages of a modern condensing furnace without unnecessary complexity. Two-stage heating helps reduce temperature swings by running at a lower stage when less heat is needed, and the variable-speed ECM blower supports steady operation by adjusting airflow to match system demand. 4-way design, built-in diagnostics and modular components help contractors simplify installation, troubleshooting and service.
The NDF Series gives homeowners the advantages of a modern condensing furnace and advanced comfort performance. Two-stage heating helps reduce temperature swings by running at a lower stage when less heat is needed, and the variable-speed ECM blower supports steady operation by adjusting airflow to match system demand. 4-way multi-position design, built-in diagnostics and modular components help contractors simplify installation, troubleshooting and service.
The NDF’s 2-stage gas valve adjusts heating output between low and high fire, helping maintain more consistent indoor temperatures than a single-stage furnace. Longer low-stage operation can also help reduce system noise and limit the temperature swings caused by full-output on/off cycling.
The variable-speed ECM blower supports efficient airflow, helping the system adapt to heating and cooling demand while using less electrical energy than conventional blower motors.
For enhanced cooling-season comfort, the NDF includes a climate compensation setting that increases moisture removal for high humidity environments.
The NDF Series supports common indoor air quality (IAQ) accessories including electronic air cleaners, humidifiers, and UV lights, making it easier to enhance your home comfort system.
The NDF can pair with a compatible heat pump as part of a dual-fuel system, allowing the home to use electric heat pump operation in milder weather and gas furnace performance when conditions call for it.
The NDF Series combines T140 aluminized primary heat exchanger tubes with a 29-4C stainless steel heat recovery coil. This design supports reliable heat transfer, corrosion resistance and long-term performance.
With 4-way multi-position installation, zero-clearance capability and two cabinet widths, the NDF is designed to fit a wide range of replacement and new-construction applications. All NDF models can be installed in upflow, downflow, horizontal left or horizontal right configurations. Adaptive staging control also allows the NDF to deliver simulated two-stage heating when paired with a single-stage thermostat, providing added flexibility for a wider range of installations.
Integrated diagnostics, modular blower and heat exchanger assemblies, flexible condensate trap mounting, and factory-fired testing help reduce startup issues, speed up troubleshooting, and make service calls smoother.
Available in capacities ranging from 50k to 105k BTU/h, the NDF600 Series gas furnaces offer high-efficiency and reliable heating, even in cold-climate regions. The flexible design features integrated diagnostics and a modular construction that simplifies service, and each model is backed by exceptional customer service and a simple warranty process.
96% AFUE high-efficiency condensing.
2-stage operation minimizes temperature swings by adjusting between low and high fire.
Modular blower and heat exchanger assemblies for easy maintenance.
Dual-fuel compatibility optimizes energy savings when paired with a heat pump.
4-way multi-position installation: upflow, downflow, horizontal left and horizontal right.
Variable speed ECM motor simplifies airflow setup and helps reduce callbacks.
Zero clearance allows simple installation for closets or alcoves.
High altitude certified up to 5400 ft* without conversion. Approved for NG and LP installations up to 10,000 ft.
*LP conversion required above 2,000 ft.
Complete your comfort system with Navien. Pair the NDF Furnace with an NAA Air Conditioner and NAM Cased Coil for reliable, year-round heating and cooling.
Navien’s inverter-driven air conditioners and capacity-matched cased coils are engineered to deliver balanced airflow, precise temperature control, optimized refrigerant performance, and reduced system cycling.
The result is a complete, system-matched HVAC solution that’s easy to install, easy to service, and designed to maximize whole-home comfort in every season.
Navien’s NDF Series furnace is a strong fit for homeowners who value consistent comfort, quiet operation, installation flexibility and long-term reliability.
With 96% AFUE, 2-stage heating and variable-speed airflow, it delivers efficient, consistent performance across a wide range of residential applications.
Our NDF Series is designed to simplify forced-air furnace replacement and new construction installation.
Installation-focused highlights:
NDF Series 4-way multi-position design supports upflow, downflow, horizontal left and horizontal right configurations, helping the furnace fit a wider range of home layouts with fewer installation constraints.
The NDF Series is designed to install efficiently, work reliably and support straightforward troubleshooting and service. Integrated diagnostics, factory-fired testing and modular assemblies help contractors work more efficiently from startup through long-term maintenance.
Service-friendly furnace features include:
The NDF Series is a condensing gas furnace with 96% AFUE. That means it converts 96% of the fuel it consumes into usable heat for your home.
Condensing furnace technology captures additional heat from combustion gases before they’re vented, helping reduce wasted energy compared to older, lower-efficiency furnaces.
ENERGY STAR® (SOUTH) certified. Confirm eligible models and rebate opportunities with your installer or local utility.
Available in NG or LP
Available in NG or LP
Available in NG or LP
Available in NG or LP
Available in NG or LP
The NDF Series is a condensing forced-air residential gas furnace. It uses natural gas as standard and can be converted to propane with a conversion kit.
No. The NDF is a forced-air gas furnace. Navien’s NPF Series is our hydronic furnace line.
A 2-stage furnace can operate at two heating levels: low fire and high fire. Low fire helps maintain comfort during milder conditions, while high fire provides more heat when outdoor temperatures plummet.
A variable-speed ECM blower can adjust airflow based on system demand. That helps improve comfort, reduce unnecessary electrical use and support quieter operation compared to traditional fixed-speed blower motors that either run full blast, or not at all.
Yes. When properly configured, the NDF’s high-humidity setting can reduce indoor airflow for more moisture removal during cooling operation.
Yes. The NDF is dual-fuel compatible and can be paired with a heat pump, allowing the system to use electric or gas heating depending on outdoor conditions and system setup.
The NDF is designed for indoor installation in residential applications such as closets, alcoves, attics, basements, crawl spaces and utility rooms when installed according to the installation manual and local codes. Every NDF model supports upflow, downflow, horizontal left and horizontal right orientation.
Yes. The NDF supports IAQ accessories such as electronic air cleaners, humidifiers and UV lights.
The NDF Series is ENERGY STAR (SOUTH) certified with a 96% AFUE rating.
No. The NDF is not an ultra-low NOx furnace and may not be suitable for regions with ultra-low NOx requirements. Our NPF furnace is ultra-low NOx.
Connect with a Navien installer to find the right furnace size, installation configuration and comfort setup for your home.
Connect with
an Installer
Connect with a Navien installer to find the right furnace size, installation configuration and comfort setup for your home.
Connect with
an Installer
