Phone #: 800-299-9470
Navien NPE-180ANG Premium Condensing Tankless Natural Gas Water Heater With Ultra Condensing Efficiency, Two Stainless Steel Heat Exchangers
Brand: Navien
Part Number: NPE180ANG

$1,297.00Free Shipping

Product Details:


Ultra Condensing Efficiency

  • Navien’s Condensing Technology offers the high efficiency.
  • Money and energy savings over a tank type water heaters and traditional water heaters.

Two Stainless Steel Heat Exchangers

  • Provide longer life expectancy as they are highly resistance to corrosion and erosion compared to copper heat exchangers.
  • Reduce minerals deposits.

Low NOx Emissions (≤ 20ppm)

  • New metal fiber burner is designed to deliver a consistent air/gas mixture improving combustion efficiency.
  • Result in less acid rain and less green house effect.
  • Comply with SCAQMD 1146.2 strict NOx emissions standard.

2” PVC, CPVC, Polyprophylene Venting Up To 60’

  • 2” venting option allows for a flue to be pulled through the existing vent.
  • 3” vents can be used up to 150’ with standard 2” x 3” adapters.

Utilizes Existing 1/2" Gas Line

  • The negative pressure gas valve and fan with dual venturi operation allows for better adaptability to low gas pressure applications.
  • Makes it possible for the NPE to be installed ” gas lines up to 24’.

Field Convertible

  • NPE models allow for easy convertibility from NG to LP.

Less Water Press Drop

  • Simple modular for water path minimizes water pressure drop.
  • Modular design for water path make maintenance easier and service can be performed easily in the field.

Intelligent Preheating Technology

  • Recognizes hot water usage patterns to intelligently provide hot water when needed.

Comfort Flow Technology

  • Eliminates cold water sandwich.
  • Saves water with the reduced time to get hot water.
  • Saves money with built-in recirculation system.
  • Intelligent pre-heating function.

Navien's Ready Link Cascade System

  • Navien’s units have built in controls for multi-unit system allowing easy setting.
  • No extra control boards are required, reducing installation costs.
  • Easy wiring between units and easy setting of the parent and child for multi-unit system.
  • 16 units can be linked as one group and cascade as many groups as you need.
  • Cascading allows for added redundancy insuring on-demand hot water in all situations.
  • Small and compact wall-hung design allows multi-unit system even in a confined area.
  • Used for hotels, schools, hospitals, beauty shops, restaurants, health centers, and more.

Front Panel Command Center

  • Self-diagnostics
  • Displays temperature and water flow rate
  • Displays status of cascade operation
  • Convertible display from F to C
  • User Friendly Interface
  • Easy setup

Remote Control (Optional)

  • Hot water temperature control
  • Recirculation timer setting
  • Function to set the number of initial activating water heaters for cascade system
  • Temperature set-up for cascade system with external tanks.


Heat Capacity (Input)
Natural Gas 15,000-150,000 BTU/h
Propane Gas 15,000-150,000 BTU/h
Energy Factor NG / LPG (DOE) 0.95/0.96
Flow Rate (DHW)
35;F(19;C) Temp Rise 8.4 GPM (32 L/m)
45;F(25;C) Temp Rise 6.5 GPM (25 L/m)
77;F(43;C) Temp Rise 3.8 GPM (14 L/m)
Dimensions 17.3"(W) x 27.4"(H) x 11.4"(D)
Weight 75 lbs (34kg)
Installation Type Indoor or Outdoor Wall-Hung
Venting Type Indoor or Outdoor Wall-Hung
Ignition Electronic Ignition
Water Pressure 15-150 PSI
Natural Gas Supply Pressure (from source) 3.5"-10.5" WC
Propane Gas Supply Pressure (from source) 8"-13" WC
Natural Gas Manifold Pressure (min to max) -0.04" WC to -0.84" WC
Propane Gas Manifold Pressure(min to max) -0.03" WC to -0.50" WC
Minimum Flow Rate 0 GPM (0 L/m)
Connection Sizes
Cold Water Inlet 3/4" NPT
Hot Water Outlet 3/4" NPT
Recirculation Inlet 3/4" NPT
Gas Inlet 3/4" NPT (Suitablefor use with 1/2" rigid gas pipe; refer to installation manual for sizing criteria)
Power Supply
Main Supply 120 V AC
Maximum Power Consumption 200 W (up to 2 amperes)
Heat Exchangers Primary Heat Exchanger: Stainless Steel Secondary Heat Exchanger: Stainless Steel
Exhaust 2" or 3" PVC
Polypropylene 2" or 3" Special Gas Vent Type BH (Class II
Intake 2" or 3" PVC
Polypropylene 2" or 3" Special Gas Vent Type BH (Class II
Vent Clearances 0" to Combustibles
Safety Devices APS
Ignition Operation Detector
Water Temperature High Limit Switch
Exhaust Temperature High Limit Sensor
Power Surge Fuse