Residential Furnaces
High Efficiency Gas Furnaces
Two furnace series.
One standard of quality.
Navien offers two distinct residential furnace lines so homeowners and contractors can match the right heating technology to the home, the climate and the budget. Whether you want a traditional, high-efficiency condensing gas furnace or the most advanced comfort hydronic forced-air technology has to offer, there's a Navien furnace made for your home.
Which water heater is best for your home?
Every Navien furnace delivers high-efficiency condensing performance, a variable-speed ECM blower, dual-fuel compatibility, and installation flexibility. Where they differ is in the comfort technology and efficiency rating, so you can pick the right balance.
| Navien Furnace | NDF Series | NPF Series |
| Furnace Type | Condensing 2-stage gas furnace | Condensing hydronic variable capacity gas furnace |
| Fuel Efficiency | 96% AFUE | 97% AFUE |
| Heating Staging | 2-stage heating with variable-speed airflow | Industry-leading variable capacity (15–100%) |
| Comfort Level | Deluxe | Maximum |
| Certifications | ENERGY STAR® (South) certified | ENERGY STAR® certified & ultra-low NOx compliant |
| Best for | Homeowners replacing a single-stage furnace who want a practical efficiency and comfort upgrade. Contractors who want a dependable furnace that's easy to install and service. | Homeowners who want the most advanced comfort available, including a variable-speed blower, whisper-quiet operation and ultra-low NOx. |
| Capacities | Five models: 50K–105K BTU/h | Nine models: 60K, 80K & 100K BTU/h |
| More details | Explore the NDF Series >> | Explore the NPF Series >> |
Not sure where to start?
Choose the NDF if you want high-efficiency 2-stage gas heating with reliable performance, consistent comfort and flexible installation options for a new home or a system upgrade
Choose the NPF if you want the quietest, most advanced Navien furnace option, more even heat, lower impact on indoor humidity, and premium comfort from hydronic forced-air technology.
Connect with a Navien Installer
A qualified Navien installer can evaluate your home, ductwork, climate, heating load and preferences to recommend the right series and model.
Connect with
an Installer
Find a Navien Installer
A qualified Navien installer can evaluate your home, ductwork, climate, heating load and preferences to recommend the right series and model.
Find an Installer
NDF Series: Condensing 2-Stage Gas Furnace
The NDF Series is designed for homeowners who want the efficiency and comfort benefits of a modern condensing gas furnace. Its 2-stage gas valve and variable-speed ECM blower help reduce temperature swings and operating noise. 4-way multi-position installation, zero-clearance capability and integrated diagnostics make the NDF easy to install and service. With five models from 50K to 105K BTU/h, it provides a high-efficiency heating option for new construction and existing homes.
Why homeowners and contractors
choose the NDF:
- 96% AFUE condensing efficiency, ENERGY STAR® (South) certified
- 2-stage heating for more consistent comfort than single-stage furnaces
- Variable-speed ECM blower for efficient, adaptive airflow
- 4-way multipoise installation with zero-clearance capability
- Self-diagnostic control and modular, service-friendly design
- Dual-fuel and IAQ accessory compatible
Explore the NDF Series
NPF Series: High-Performance Hydro-furnace
NPF is Navien's premium furnace, and the most comfortable way to heat your home. The NPF hydro-furnace heats water in a sealed combustion heat exchanger, completely isolated from the airstream, then pumps the heated water through a hydronic heat exchanger that gently transfers warmth into the air. Because the air is exposed to much lower temperatures than a conventional gas furnace, the NPF delivers consistent comfort with less impact on humidity. At 97% AFUE with industry-leading variable capacity operation and ultra-low NOx compliance, the NPF is the most advanced furnace in our lineup.
Why homeowners and contractors
choose the NPF:
- 97% AFUE with industry-leading variable capacity operation (15–100%)
- Hydronic heat exchanger and isolated combustion for quiet, comfortable heat
- Ultra-low NOx compliant for cleaner operation
- Uses standard gas lines and ductwork for simplified installation
- Available in upflow, downflow and horizontal configurations
Explore the NPF Series
What makes a hydronic furnace different?
A conventional gas furnace burns fuel to heat the air directly, but a hydronic forced-air furnace like the NPF uses combustion to heat water outside the airstream, then transfers that heat into the airstream. Keeping combustion in a sealed, separate compartment makes for quieter, more even heating with less impact on indoor humidity.
Want more insight on how hydronic forced-air heating works? Explore the NPF Series →
Using a Navien furnace in a dual-fuel system
Both the NDF and NPF are dual-fuel compatible, so they can pair with a heat pump to switch between high-efficiency electric or gas heating based on outdoor conditions: heat pump in mild weather, furnace when it’s truly cold. Learn more about how dual-fuel systems work or get to know our NAZ Series air-to-air heat pump.
Residential Furnace FAQs
What’s the difference between the Navien NDF and NPF furnaces?
The NDF is a high-efficiency 2-stage condensing gas furnace designed for dependable performance, consistent comfort and installation flexibility. The NPF is Navien’s premium hydro-furnace, using hydronic forced-air technology for more advanced comfort, quieter operation and ultra-low NOx performance.
Is a 2-stage furnace better than a single-stage furnace?
A 2-stage furnace can provide more consistent comfort than a single-stage furnace because it runs at a lower heating stage when less heat is needed, then shifts to a higher stage during colder conditions. This helps reduce temperature swings and can make the system quieter during everyday operation.
How long does a furnace typically last?
A furnace typically lasts 15 to 20 years, depending on the equipment, installation quality, maintenance and how hard the system works each heating season. Regular maintenance helps protect performance and extend service life.
How often do furnaces need maintenance?
Furnaces should be inspected and serviced once a year, ideally before the heating season begins. Annual maintenance helps keep the heating system running safely, efficiently and reliably.
Do gas furnaces use electricity?
Yes. Gas furnaces burn natural gas or propane for heat, but they still need electricity to power components such as the blower motor, ignition system, control board and safety sensors.
Are high efficiency furnaces worth it?
High efficiency furnaces can be worth considering for both new homes and replacements, particularly when reducing energy waste and improving comfort are priorities. The right choice ultimately depends on your home, climate, utility costs and how long you plan to stay in the house.
What size furnace do I need?
The right furnace size depends on your home’s square footage, insulation, ductwork, climate, layout and heating load. A qualified contractor should perform a proper load calculation instead of choosing a furnace based on home size alone.
Who installs furnaces?
Furnaces should be installed by a qualified HVAC contractor. A professional installer can confirm the correct size, venting, fuel connection, airflow setup and system configuration for your home.
Find the right Navien furnace for your home
Connect with a qualified Navien installer to compare the NDF and NPF and find the right furnace, size and configuration for your home or building plan.