Why we love this product.

  • Premium non-condensing tankless water heater
  • Exterior unit designed for outdoor installations
  • Available in natural gas (NG) or liquid propane (LP)
  • Low NOx emissions of only 20ppm


The NPN-199E is a premium non-condensing tankless water heater that combines exceptional durability, performance, and efficiency. With its NaviTech stainless steel heat exchanger and burner, this water heater stands out in terms of reliability and longevity. The NPN-199E also features cascading capability, enabling multiple units to be connected for higher capacity requirements. Moreover, it boasts low NOx emissions of only 20 ppm, ensuring environmental friendliness.

NPN-199E Features

  • Exclusive NaviTech™ stainless steel heat exchanger for unmatched durability and performance
  • Exterior control panel for easy adjustment of water temperature, operation status, and troubleshooting
  • Built-in Air Pressure Sensor (APS) to monitor the vent system, maintain proper air/gas ratio, and ensure consistent Domestic Hot Water output
  • Patented NaviTech™ stainless steel burner for higher efficiency
  • Built-in recirculation control on the circuit board for proper system setup and reduced installation time and cost
  • Built-in Water Adjustment Valve (WAV) and Mixing Valve to control flow and stabilize water temperature during changes
  • Approved for mobile and manufactured homes, making it ideal for eco-friendly houses
  • Space-saving design with wall-hung units that require less room and are lighter than traditional tank water heaters
  • Low noise levels for installation near outdoor living spaces without disturbance
  • Easy retrofit installation with a pin-to-pin design that matches other tankless models for a simpler swap
  • Manufacturing integrity with Navien engineering and production of 90% of the components used in the NPN-E series units

Discover the outstanding features and benefits of the NPN-199E premium non-condensing tankless water heater. With its innovative technology and reliability, this water heater is a top choice for residential and commercial applications.