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NHW-199SE

premium Non-Condensing Tankless Water Heater

  • NaviTech stainless steel heat exchanger and burner
  • Compact, space-saving design perfect for retrofitting
  • Exterior unit for outdoor installations
  • NG available now. LP coming soon
  • Cascading capable
  • Low NOx emissions (20ppm)
Navien NHW-199SE non-condensing outdoor tankless water heater
  • NaviTech stainless steel heat exchanger and burner
  • Compact, space-saving design perfect for retrofitting
  • Exterior unit for outdoor installations
  • NG available now. LP coming soon
  • Cascading capable
  • Low NOx emissions (20ppm)
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NHW-199SE premium features and benefits

Npn-e
Exchanger

Exclusive NaviTech™ stainless steel heat exchanger. The NHW-S series is the first non condensing tankless water heater with a stainless steel heat exchanger to deliver unmatched durability and performance.

B4

NPN - Exterior control panel allows you to adjust water temperature, operation status and troubleshooting.

C2

Built-in Air Pressure Sensor (APS) monitors the vent system for blockage, automatically compensates for the range of vent lengths, helps maintain proper air/gas ratio during operation, and ensures consistent Domestic Hot Water output during changing conditions.

Nhw-se-open-callouts
Burner

Patented NaviTech™ stainless steel burner. Designed and manufactured by Navien to burn gas at higher efficiency than other system on the market.

E2

Recirculation control built into circuit board. Ensures proper system setup, and reduces the need for additional components, saving installation time and cost.

F3

Built-in Water Adjustment Valve (WAV) and Mixing Valve control flow to maintain setpoint, and stabilize water temperature during flow changes.

NHW-199SE QuickFacts

NHW‑SE Videos

NHW-199SE FAQs

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 NHW-SE 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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Max DHW Input: 199,900 BTU/h
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