Tankless Water Heater Series

Navien makes it easy to go tankless with the number one condensing tankless water heater in North America


New NPE-2 Series
Condensing Tankless Water Heaters

Navien Premium Efficiency condensing tankless water heaters are the #1 selling high efficiency condensing tankless water heaters in North America. The NPE-2 series offers ultra high efficiency up to 0.96 UEF to keep your utility bills low, endless hot water, and exclusive ComfortFlow® technology with built in recirculation pump and buffer tank.


Learn more about the
 NPE-A2 Series

Learn more about the
NPE-S2 Series

Find an installer
near you

How condensing
systems work

Navien NPE tankless water heaters
Navien NPN tankless water heaters

NPN Series
Tankless Water Heaters

Navien Premium Non-condensing tankless water heaters deliver a continuous flow of hot water for as long as you need it. No waiting for a tank to reheat more water, wasting time and energy. NPN series is the only non-condensing tankless water heater to offer NaviTech™ stainless steel heat exchanger and stainless steel burner for durable and eco-friendly performace.


Learn more about the
NPN-Universal Series

Learn more about the
NPN-Exterior Series

Find an installer
near you

How non-condensing
systems work

All the hot water you need, for as long
as you need it




How Condensing works

  1. When a hot water tap is opened, the tankless water heater detects the flow

  2. The flow sensor activates to determine the amount of hot water needed

  3. The igniter activates

  4. The gas control valve opens to supply the correct amount of gas

  5. The fan and venturi activate to provide the correct amount of gas and fuel

  6. The premix burner ignites providing a flame to heat the water

  7. Cold water is pre-heated in the secondary heat exchanger

  8. Pre-heated water passes from the secondary to the primary heat exchanger

  9. The unit determines outgoing set temperature and adjusts the flame to heat the water

  10. Heated water moves to the buffer tank

  11. Desired hot water amount delivered to the faucet

Bulky tanks are history... Navien high efficiency tankless is the future

  • Endless hot water when you want it
  • Compact space saving design
  • Lower energy bills
  • Longer life than tanks
  • 15 year warranty dual stainless steel heat exchangers

Navien NPE-2 Series condensing tankless water heaters deliver an endless supply of hot water for any size home.

Besides providing hot water where and when it’s needed, the NPE-2 Series offer homeowners the following benefits:

  • Much more energy efficient than old fashioned tank systems
  • Ultra high energy efficiency —
    up to 0.96 UEF
  • Backed by the industry's strongest warranty – 15 years on heat exchangers
  • Energy Star certified
  • Takes about 80% less space than old fashioned tank heaters
  • Longer lasting than tank heaters
  • Easy to use control panel
  • Elegant, clean appearance
  • Improves resale value
  • Ideal for replacements or new construction

Enhance your home comfort with Navien’s high efficiency water heaters…the ultimate endless hot water solution


  • Npe-2-feature-heatexch

    Dual stainless steel heat exchangers last longer
    than copper.

  • Nfc-feature-flat-plate

    Condensing technology reduces energy consumption and greenhouse gas emissions

  • Npe-2-feature-navilink

    Optional NaviLink™ Wi-Fi control system gives you access to your Navien systems from anywhere in the world

  • Npe-2-feature-cascade

    For homes with extra high demand, NPE-2 Series units can be cascaded without an external control

  • Npe-2-feature-hotbutton

    HotButton on-demand recirculation option with built-in controller

  • Npe-2-feature-h2air

    H2Air combination space heating and domestic hot water supply optional for NPE-A2 models

The ultimate in energy efficiency

Navien condensing technology provides up to 0.96 UEF. These extremely efficient and eco-friendly units provide extra energy savings over traditional tank and non-condensing tankless water heaters.

Operating Cost

Navien Tankless
175.0 therms
Other Tankless
209 therms
50 Gallon Tank
269 therms
* Based on Energy Guide cost estimates using $1.09 per therm of natural gas. Cost is in US dollars.

Protect the environment
as you add value

Navien condensing stainless steel heat exchangers recover extra heat that would be lost in non-condensing boilers. The result is a reduction in energy consumption, lower CO2 emissions and low exhaust temperatures allowing the use of less expensive venting materials such as Schedule 40 PVC.


How Non-condensing works

how non-condensing tankless water heaters work
  1. When a hot water tap is opened, the tankless water heater detects the flow

  2. The flow sensor activates to determine the amount of hot water needed

  3. The igniter activates

  4. The gas control valve opens to supply the correct amount of gas

  5. The burner ignites providing a flame to heat the water

  6. Cold water passes through the heat exchanger

  7. The unit determines outgoing set temperature and adjusts the flame to heat the water

  8. Desired hot water amount delivered to the faucet

Navien NPN Premium Non-Condensing Tankless Water Heaters

Introducing The New NPN Series

Compare our advantages to other non-condensing tankless water heaters

Exclusive Navien NPN-Universal indoor or outdoor unit and NPN-Exterior dedicated outdoor unit. NPN-E outdoor models also feature remote control and built-in button controls for easy service. 

NPN series tankless water heaters
  • NPN tankless water heaters burner

    Navitech™ exclusive stainless steel heat exchanger.

    NPN series are the first and only non condensing tankless water heaters with a stainless steel heat exchanger to deliver unmatched durability and performance.

  • NPN tankless water heaters heat exchanger

    Navitech™ stainless steel burner.

    Designed and manufactured by Navien to burn gas at higher efficiency than other system on the market.

  • NPN tankless water heaters cascade

    Cascading capability.

    For increased domestic hot water flow demand, the NPN can be cascaded with another NPN unit.

  • NPN tankless water heaters NaviLink

    NaviLink™ Wi-Fi remote control.

    This optional accessory enables you to control temperatures remotely, access usage data and receive diagnostic notifications from your smart phone or tablet.

  • NPN tankless water heaters sleek design

    Space saving and lighter weight design.

    These sleek wall-hung units use much less space and are substantially lighter than traditional tank water heaters and other non-condensing tankless water heaters.

  • NPN tankless water heaters closet

    Low noise levels.

    Installations in or near media rooms, recreation rooms or any living areas of the house are possible with the quiet running NPN tankless water heaters.

Navien tankless water heaters make the world greener

Lower energy bills, easier on the planet.


Unlike systems that waste energy to heat large tanks of water, Navien NPN series tankless units utilize 82¢ of every $1 to heat your water. NPN only fires up when hot water is needed allowing great utility savings and a lower impact on the environment.

Navien tankless water heaters provide a better environment for kids