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Tankless Water Heaters
Navien NPE-2 Series high efficiency tankless water heaters provide endless domestic hot water, all while keeping your utility bills low.
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 a built-in recirculation pump and buffer tank.
New NPE-A2 Series
Three NPE-A2 Advanced Premium models offer a Uniform Energy Factor up to .95 and feature Navien’s patented ComfortFlow system.
Learn more about the
NPE-A2 Series
New NPE-S2 Series
Four NPE-S2 Standard Premium models offer a Uniform Energy
Factor up to .96, providing more output, lower installation costs
and lower operating costs.
Learn more about the
NPE-S2 Series
Condensing VS Non-Condensing Tankless Water Heaters
What’s the difference between condensing and non-condensing tankless water heaters?
| Condensing | Non-Condensing | |
| Initial cost | Usually higher than comparable non-condensing | Usually lower than comparable condensing |
| Long term operating cost | Lower than typical non-condensing tankless and storage tank system | Could be higher than condensing but lower than storage tank systems |
| Efficiency | Ultra-high Efficiency (UEF up to .96) | High Efficiency (UEF > .80) |
| Maintenance requirement | Annual service recommended | Minimal |
| Venting | PVC acceptable | 3" x 5" metal concentric required |
| Installation Location | Indoor or Outdoor | Choice of interior or exterior |
| Durability | Stainless steel heat exchanger extend service life | Stainless steel heat exchanger extend service life |
| Dimensions | Slightly larger than non-condensing, about 70-80% smaller than tank system | Slightly smaller than condensing, 80% smaller than tank system |
All the hot water you need, for as long
as you need it
How Condensing Tankless Water Heaters Work
Ultra high-efficiency tankless water heaters—also known as condensing tankless—use two heat exchangers to supply endless hot water when you turn on a faucet. They use less energy (and money) than traditional water heaters because they don't need to reheat the water over and over.
When a hot water tap is opened, the tankless water heater detects the flow
The flow sensor activates to determine the amount of hot water needed
The igniter activates
The gas control valve opens to supply the correct amount of gas
The fan and venturi activate to provide the correct amount of gas and fuel
The premix burner ignites providing a flame to heat the water
Cold water is pre-heated in the secondary heat exchanger
Pre-heated water passes from the secondary to the primary heat exchanger
The unit determines outgoing set temperature and adjusts the flame to heat the water
Heated water moves to the buffer tank
Desired hot water amount delivered to the faucet
When a hot water tap is opened, the tankless water heater detects the flow
The flow sensor activates to determine the amount of hot water needed
The igniter activates
The gas control valve opens to supply the correct amount of gas
The fan and venturi activate to provide the correct amount of gas and fuel
The premix burner ignites providing a flame to heat the water
Cold water is pre-heated in the secondary heat exchanger
Pre-heated water passes from the secondary to the primary heat exchanger
The unit determines outgoing set temperature and adjusts the flame to heat the water
Heated water moves to the buffer tank
Desired hot water amount delivered to the faucet
Navien Condensing Tankless Water Heaters
The Navien NPE-2 series is a line of high-efficiency condensing tankless water heaters featuring a user-friendly control panel. These tankless water heaters can be installed indoors or outdoors, for residential or commercial use.
Navien NPE-2 High Efficiency Condensing Tankless Water Heaters
NPE-A2 Series
Advanced condensing tankless water heaters featuring Navien’s patented ComfortFlow® system.
NPE-180A2
Max Input: 150,000 BTU/h
Indoor or outdoor wall-hung
Residential/Commercial
ComfortFlow® Technology
NPE-180A2
NPE-210A2
Max Input: 180,000 BTU/h
Indoor or outdoor wall-hung
Residential/Commercial
ComfortFlow® Technology
NPE-210A2
NPE-240A2
Max Input: 199,900 BTU/h
Indoor or outdoor wall-hung
Residential/Commercial
ComfortFlow® Technology
NPE-240A2
NPE-S2 Series
Navien’s standard ultra high-efficiency condensing tankless water heaters.
NPE-150S2
Max Input: 120,000 BTU/h
Indoor or outdoor wall-hung
Residential/Commercial
ComfortFlow® Technology
NPE-150S2
NPE-180S2
Max Input: 150,000 BTU/h
Indoor or outdoor wall-hung
Residential/Commercial
ComfortFlow® Technology
NPE-180S2
NPE-210S2
Max Input: 180,000 BTU/h
Indoor or outdoor wall-hung
Residential/Commercial
ComfortFlow® Technology
NPE-210S2
NPE-240S2
Max Input: 199,900 BTU/h
Indoor or outdoor wall-hung
Residential/Commercial
ComfortFlow® Technology
NPE-240S2
NAVIEN TANKLESS WATER HEATERS FEATURES
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
Learn more about the
NPE-A2 Series
Learn more about the
NPE-S2 Series
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
Benefits of Navien Condensing Tankless Water Heaters
The Ultimate Endless Hot Water Solution For Your Home
Durable, Long-Lasting Construction
Navien NPE-2 condensing tankless water heaters use durable dual stainless steel heat exchangers
Eco-Friendly
Condensing technology reduces energy consumption and greenhouse gas emissions
Control from Your Phone
Optional NaviLink™ Wi-Fi control system gives you access to your Navien systems from anywhere in the world
Multiple venting options
For homes with extra high demand, NPE-2 Series units can be cascaded without an external control
On-demand Recirculation
HotButton on-demand recirculation option with built-in controller
Optional Forced Air Systems
H2Air combination space heating and domestic hot water supply optional for NPE-A2 models
Tankless Water Heaters FAQs
Below are the top questions (and answers) about tankless water heaters from our customer service team.
How do you install a tankless water heater?
Installing a Navien tankless water heater is best done by a licensed plumbing contractor professional because it involves disconnecting and reconnecting gas lines. Venting and wiring also require professional expertise to ensure the installation meets building codes. Use Navien’s installer and service locator to find a specialist in your area.
Is it worth switching to a tankless water heater?
It is worth switching to a tankless water heater if you are looking for a more efficient option. Tankless water heaters can save you money on your energy bill, and they can also have a longer lifespan than traditional water heaters.
What size tankless water heater do I need?
To choose the right size tankless water heater for your home, you will need to consider a few factors, such as: the number of people in your household, the average water usage in your household, and the climate in your area.
Where can I buy Navien tankless water heaters?
A Navien tankless water heater must be purchased and installed by a licensed plumber. Find a Navien installer near you.
Do tankless water heaters need a condensate drain?
Condensing tankless water heaters need a condensate drain. This is because when the water is heated, it produces condensation that needs to be drained away. The condensate drain ensures that this doesn’t build up and cause problems with the tankless water heater.
How often do I need to descale my tankless water heater?
Descaling is a process that removes mineral deposits from the inside of the tankless water heater. It’s something that needs to be done every few years, depending on the hardness of your water.
How long do Navien tankless water heaters last?
Navien tankless water heaters have a lifespan of up to 20 years. However, proper maintenance is required in order to achieve this lifespan.
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
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.
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