Navien NPE-210S LP/NG Premium Condensing Tankless Water Heater


Retail Price: $2290.00
Weight: 89.00 lbs

Rush Order:

Get a high performance condensing tankless water heater compatible with existing 1/2" gas pipe lines.

No more initial cold water out the faucet or shower, thanks to the ComfortFlow feature exclusive to Navien NPE-Advanced water heaters.

  •  Eliminates cold water sandwich.
  •  Built-in recirculation system will save you money.
  •  Intelligent pre-heating function.

Energy Star logoUltra Condensing Efficiency

→ Navien's Condensing Technology allows high efficiency heating
→ Significant energy savings over traditional water heaters

Dual Stainless Steel Heat Exchangers

→ Longer life expectancy than copper heat exchangers. More resistant to corrosion
→ Less mineral scaling and deposits

Low-nox-emissionsLow NOx Emissions

→ New metal fiber burner delivers a consistent gas/air mixture
→ Less greenhouse gas emissions and acid rain
→ SCAQMD 1146.2 compliant

2" PVC, CPVC, Polypropylene Venting

→ 2" vent allows you to install a flue through an existing vent
→ 3" vent can be used up to 150' on standard 2" x 3" adapters

Uses Existing 1/2" Gas Line

→ Dual venturi fan and negative pressure gas valve for better adaptability with low gas pressure
→ NPE installation in 1/2" gas lines up to 24 feet

Field Convertible

→ NPE models allow easy conversion from/to natural gas and liquid propane

Less Water Pressure Drop

→ Simple, modular water path minimizes water pressure drops
→ Modular water path design makes maintenance and servicing easier

Navien NPE-180A LP/NG Premium Condensing Tankless Water Heater

Ready Link Cascade System connects multiple units in parallel for larger applications.

Ready-Link Cascading Features

  •  Includes built in controls for easily setting adjustments.
  •  Easy wiring between units and easy parent-child configuration for multi-unit systems.
  •  No extra control boards are needed, reducing installation costs.
  •  16 units can be linked as a single group and cascaded to as many groups as needed.
  •  Cascading provides redundancy for reliable on-demand hot water at any time.
  •  Compact wall-hung design allows a multi-unit system even in confined areas.
  •  Ideal for hotels, schools, beauty shops, restaurants, health centers, hospitals and more.

Outdoor vent kit available here.

Front Panel Command Center

  •  Easy setup
  •  Self-diagnostics
  •  User friendly interface
  •  Convertible display from °F to °C
  •  Cascade operation status display
  •  Temperature and water flow rate indicator

Optional Remote Control

  •  Recirculation timer setting
  •  Hot water temperature control
  •  Configurable temperature for cascade systems with external tanks
  •  Configurable number of initial activating water heaters in cascade systems

asme-logo NSF logo ahri-seal CSA-certified


Important:  Navien water heaters are shipped ready for natural gas. Consult the Gas Conversion Guide for use with liquid propane.

  NPE-150S NPE-180S NPE-210S NPE-240S
Heat Capacity NG/LP 18,000-120,000 BTU/h 15,000-150,000 BTU/h 19,900-180,000 BTU/H 19,900-199,900 BTU/H
Energy Factor NG/LP 0.97 
Flow Rate at 35°F Rise 6.8 GPM 8.4 GPM 10.1 GPM 11.1 GPM
Flow Rate at 45°F Rise 5.3 GPM 6.5 GPM 7.8 GPM 8.7 GPM
Flow Rate at 67°F Rise 3.2 GPM 4.2 GPM 5.0 GPM 5.6 GPM
Width 17.3" 
Height 27.4"
Depth 13.2" 13.2" 13.2"
Weight 55 lbs 67 lbs 75 lbs
Installation Type Indoor or Outdoor Wall-Hung  
Venting Type Forced draft direct vent  
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 -0.38" WC -0.04" WC to -0.84" WC -0.04" WC to -0.36" WC -0.04" WC to -0.58" WC
Propane Gas Manifold Pressure (min to max) -0.04" WC to -0.42" WC -0.03" WC to -0.50" WC -0.02" WC to -0.66" WC -0.02" WC to -0.78" WC
Minimum Flow Rate 0.5 GPM  
Cold Water Inlet 3/4" NPT  
Hot Water Outlet 3/4" NPT  
Gas Inlet 3/4" NPT (Suitable with 1/2" rigid gas pipe. Refer to installation manual for sizing criteria.)  
Main Supply 120 V AC, 60Hz  
Maximum Power Consumption 200W (max 2A), 350W (max 4A) with external pump connected  
Casing Cold rolled carbon steel  
Heat Exchangers Primary and secondary heat Exchangers: stainless steel
Exhaust 2" or 3" PVC, CPVC, Polypropylene 2" or 3" Special Gas Vent Type BH (Class II, A/B/C)  
Intake 2" or 3" PVC, CPVC, Polypropylene 2" or 3" Special Gas Vent Type BH (Class II, A/B/C)  
Vent Clearances 0" to Combustibles  
Safety Devices APS, Ignition Operation Detector, Water Temperature High Limit Switch, Exhaust Temperature High Limit Sensor, Power Surge Fuse  

Box contents

Tankless Water Heater
Installation & Operation Manual
Quick Installation Manual
Wall Mounting Bracket
Four Tapping Screws & Anchors
LP or NG Conversion Kit
Two 2" Vent Termination Caps
Four 2" Wall Flanges
Spare Parts (fuse, etc.)


NPE-A Series and NPE-S Series Brochure

Operation Manual

Installation Manual

Quick Install Guide

Vent Guide

Gas Conversion Guide

FAQ (Frequently Asked Questions)

Q1: I would like to buy this Navien heater to replace another water heater that uses metal vent pipe. I read the manual that describes various PVC products to use for venting. The manual does not state that metal should not be used. Are there any performance issues if I use my metal exhaust vent pipe and not the PVC type pipe?
A1: Yes, the reason for using PVC versus metal is for energy efficiency. Navien recommends using PVC because the NPE and NR heaters are condensing type heaters. Using PVC provides the maximum condensing function. The Navien heaters will run more efficiently with PVC.

Yes, you could use your metal venting instead of PVC; the heater will still work safely. Alternatively, you could install the PVC inside the metal venting, using the metal venting as a chase (like a conduit).

Q2: What are the differences between the NPE series and the NR series heaters?
* Efficiency is slightly higher on the NPE.
* NPE has a front panel display where you can change the temperature as well as see diagnostic messages. On the NR, temperature changes can only be done with the remote control or inside the unit.
* The gas valve on the NPE is negative pressure. On the NR it is positive pressure, which relies on the pressure of the gas line.
* The gas connection on NPE is on the left. On the NR it is on the right.
* NR has 3" exhaust and intake venting. The NPE has 2" exhaust and intake venting. Conversion from 3" to 2" can be done with a common 3" to 2" reducer here: Both the NR and NPE use Schedule 40 PVC.
* NR dimensions: 17.0 W x 28.0 H 14" D
* NPE dimensions: 17.3 W x 27.4" H 11.4" D
* The NPE series has many more improvements over the NR series.

Q3: What is the primary difference between the Navien NPE-A and NPE-S?
A3: The A series has a buffer tank and recirc. pump. The S series is more efficient by 2% and has an AFUE of 98-99%.

Q4: Do the NPE series heaters include a remote control?
A4: No. It is an optional accessory. Look for the NaviLink in the Related Gadgets section below.
Q5: How high can I set the water output temperature?
A5: The NPE A and S series heaters ship from the factory with a maximum set water output temperature of 140°F. However, on the front panel the heater can be set to Commercial Mode which allows for setting a higher output temperature, up to a maximum of 182°F.

Installation Help and Recommendations

We recommend that you have a professional tankless water heater installer review the above recommendations. Improper installation may cause loss of life and/or property.

Need an installer? Get 4 FREE Tankless Water Heater Installation Estimates Now. It's Quick and Easy!
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The NAVIEN and KD NAVIEN, and ComfortFlow trademarks are the property of Navien America, Inc. and/or KyungDong Navien.


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