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NPN-Exterior

Non-Condensing Gas Tankless Water Heater

Npn-e-2021
gas tankless water heater installed on exterior wall of home with homeowner and service technician standing nearby

Endless hot water, innovation & technical support

Outdoor wall-hung tankless gas water heaters available in natural gas (NG) or liquid propane (LP).

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The #1 selling
tankless water heaters.

Navien is now the #1 manufacturer of all gas tankless water heaters (condensing and non-condensing) in North America*

*According to BRG

Learn More

NPN-E control panel

user-friendly controls allow you to adjust water temperature, operation status and troubleshooting.

control panel inside outdoor gas tankless water heater

NPN-E Models

Navien gas outdoor tankless water heaters can be cascaded to meet high-volume hot water demand. All NPN-E units include built-in recirculation control and software, and a water adjustment valve (WAV) and mixing valve to stabilize temperature during flow changes. The built-in air pressure sensor (APS) monitors and maintains air/gas pressure ratio during operation and ensures consistent hot water output during partial air blockage.

NPN-160E
Max DHW Input: 160,000 BTU/h
Outdoor wall-hung
Residential/Commercial

Available in NG or LP

Navien NPN-160E non-condensing outdoor tankless water heater
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NPN-160E
NPN-180E
Max DHW Input: 180,000 BTU/h
Outdoor wall-hung
Residential/Commercial

Available in NG or LP

Navien NPN-180E non-condensing outdoor tankless water heater
View model
NPN-180E
NPN-199E
Max DHW Input: 199,900 BTU/h
Outdoor wall-hung
Residential/Commercial

Available in NG or LP

Navien NPN-199E non-condensing outdoor tankless water heater
View model
NPN-199E

NPN-E Advantages

  • Approved for mobile & manufactured homes. NPN-E outdoor gas tankless water heaters are ideal for eco-friendly houses of all sizes.
  • Space-saving design. Sleek wall-hung units need less room and are substantially lighter than traditional tank water heaters.
  • Easy retrofit installation. Pin-to-pin design matches configuration of other tankless models for a simpler swap.
  • Manufacturing integrity. Navien engineers and produces 90% of the components used in our NPN-E series units.
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Optional hot water activation
system for all NPN-E units

 

At the push of a button, the Navien HotButton activates an external pump and heats water in the supply lines to provide hot water whenever it’s needed.

Navien Hot Button control kit with wall plate and push button

NPN-E FAQ

Outdoor tankless water heaters generally have a lifespan of about 15 to 20 years. Navien heat exchangers have a warranty of 15 years.

Navien tankless water heaters provide on-demand hot water. A gas line, sufficient combustion air, a vent to evacuate combustion gas, and an electrical outlet are required to operate the gas unit properly.

Using an outside tankless water heater frees up space indoors. No additional venting is required when installing an NPN-E Series tankless water heater outside in non-freezing regions.

A gas tankless water heater installed outdoors will be exposed to the elements, so you should not install a tanklesswater heater outdoors if your region experiences freezing temperatures. Depending on the layout of your property and local building codes, there may be restrictions on where you can install an outdoor tankless water heater. It will need to be a certain distance away from windows, doors and ventilation intakes to prevent exhaust gas from entering the building.

Choosing between an indoor or outdoor tankless water heater depends on your region's climate, the space you have available for installation, and local code requirements. Outdoor water heaters should not be installed if there will be freezing temperatures. But in milder regions, an outdoor water heater can be a good solution if an indoor unit would require extensive or complex venting.

Installing an outdoor water heater should always be done by a certified Navien technician by a licensed plumber - you can find an installer here. When installing an outdoor tankless water heater it's important to choose a location that allows maintenance access, satisfies local codes and proper installation requirements. You'll also need to make sure the wall can support the weight of the unit, and allow for connections to gas, water and electrical supply.  

No, you cannot install an outdoor unit in a garage. Outdoor units can only be installed outdoors.

In comparison with traditional water heaters, tankless water heaters can be up to 34% smaller. Navien units can also be installed in more places, including crawl spaces and attics, since they are so small- about the size of a small suitcase.

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