You accept the use of cookies as described in our Privacy Policy by clicking 'OK'.
Tankless Water Heaters
Condensing
Non-Condensing
Navien NPE-2 Series and NPN Series high efficiency tankless water heaters provide endless domestic hot water, all while keeping your utility bills low.
A tankless water heater is a type of water heater that doesn’t use a storage tank to heat water. Instead, hot water is produced only when you need it. Tankless water heaters are smaller and more efficient than traditional water heaters.
Navien offers models of tankless water heaters that use either condensing or non-condensing technology. Details on the differences between the two are below.
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
Non-Condensing
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 performance.
NPN-U Series
NPN-U (Universal) premium non-condensing tankless water heaters offer a compact tankless solution for both indoor and outdoor installations.
Learn more about the
NPN-Universal Series
NPN-E Series
NPN-E (Exterior) non-condensing tankless water heaters offer a compact tankless solution for outdoor installations.
Learn more about the
NPN-Exterior 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 |
Learn more about the
types of tankless water heaters
All the hot water you need, for as long
as you need it
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
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.
Find a Navien Tankless Water Heater Installer Near You
Find an Installer