NPF Series

The heat exchanger is where fuel is burned and heat is transferred, so it works under extremely high temperatures and needs to be durable. Combustion naturally creates moisture and acidic exhaust that can wear down lesser materials over time. Stainless steel is an ideal material for a combustion heat exchanger because its structural integrity can withstand the thermal stress from heating/cooling cycles, and it has excellent corrosion resistance to combustion byproducts.

A modulating burner has a special gas valve that adjusts in tiny increments to precisely match heating demand. Modulating gas burners are more energy efficient than single-stage burners (on/off) or two-stage burners (fixed high/low settings), and better at maintaining your desired temperature for more comfortable heating.

Navien’s NHW-A models offer five recirculation modes to make it easy to enjoy endless hot water on demand: Internal, Always On, Intelligent Preheat, Scheduled, and On-Demand (with HotButton™).

It isn’t a requirement, but you’ll notice the difference! A constant CFM blower continually adjusts its speed to deliver just the right amount of airflow instead of blasting on and off like an older furnace. That means fewer temperature swings, lower energy bills, softer startups and shutdowns, and less wear-and-tear on components. It also runs more quietly and can help improve indoor air quality when paired with air-filtration accessories. Learn more about how variable capacity furnaces compare to single and 2-stage.

Yes, the NPF hydro-furnace is designed to sustain airflow up to 0.8” external static pressure, so it’s compatible with most of today’s high-efficiency air filtration systems without straining the system.

AFUE stands for Annual Fuel Utilization Efficiency, but what really matters is how much fuel goes toward heating your home instead of being wasted. A 97% AFUE furnace like the Navien NPF turns 97 cents of every dollar you spend on gas into usable heat. That means lower energy bills, less wasted fuel, and fewer emissions compared to older furnaces.

It means the furnace can heat using either gas or electric power when the furnace is paired with a heat pump. The system can automatically switch between the two depending on which is more efficient at the time, or which can provide the desired capacity, maximizing comfort and energy savings.

The NPF can pair with your AC or heat pump and a humidistat to actively manage indoor humidity year-round. Less dry air in winter and less stickiness in the summer make your home more comfortable and can be better for your health.

The supply and return air sensors let the furnace track air temperature coming in and going out, so the system can fine-tune performance for more even heating and greater efficiency. You get consistent comfort without hot and cold spots.

The NPF is designed to fit where a standard forced-air furnace would go, without major modifications. It uses standard-width coils, and the gas, electrical, and water connections can be set up on either side of the unit to match your existing utility lines so the furnace adapts to your home instead of the other way around. It also comes with kits for both propane and high-altitude installations. For added flexibility, the NPF supports one- or two-pipe venting (so installers can choose the best option for your home’s layout) and is available in both vertical upflow and horizontal models, so whether your furnace lives in a basement, attic, or crawl space, there’s a configuration that fits.  In most cases, installation of the NPF hydro-furnace is no more time-consuming or costly than a traditional furnace—just easier to live with once it’s in!

A condensing furnace is also referred to as a high-efficiency furnace because it captures extra heat from exhaust gases that older, (standard efficiency) non-condensing furnaces simply vent outside. That makes it much more efficient (up to 97% AFUE in the case of the NPF), so you get more heat from the same amount of fuel. Learn more about condensing vs non-condensing furnaces.