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NHW-AI

Non-Condensing Gas Tankless Water Heater

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Endless hot water, innovation & technical support

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

NPN-E control panel

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

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NHW-A 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.

NHW-AE Models

NHW-160AI
Max DHW Input: 160,000 BTU/h
Indoor wall-hung
Residential/Commercial

Available in NG or LP

Navien NHW-160AI non-condensing indoor tankless water heater
View model
NHW-160AI
NHW-180AI
Max DHW Input: 180,000 BTU/h
Indoor wall-hung
Residential/Commercial

Available in NG or LP

Navien NHW-180AI non-condensing indoor tankless water heater
View model
NHW-180AI
NHW-199AI
Max DHW Input: 199,900 BTU/h
Indoor wall-hung
Residential/Commercial

Available in NG or LP

Navien NHW-199AI non-condensing indoor tankless water heater
View model
NHW-199AI

NHW-AI Models

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

Available in NG or LP

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

Available in NG or LP

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

Available in NG or LP

Navien NHW-199AE non-condensing outdoor tankless water heater
View model
NHW-199AE

NHW-AE 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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Recirculation System


NHW-A series tankless water heaters have 5 recirculation modes: Internal, Always On, Intelligent Preheat, Scheduled, and On-Demand with HotButton™ (optional accessory). One button push activates the internal recirculation pump and gas-fired burner, heating water in the supply lines to deliver hot water faster, while saving water and money. HotButton is CA Title 24 compliant.

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.

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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