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We make it easy to go tankless for residential and commercial applications



Our standard ultra condensing tankless technology with the industry’s top rated unit for energy efficiency

  • More output for the money.
  • Lower installation costs.
  • Lower operating costs for the homeowner.
  • Earn LEED points.
  • Lower HERS score.
  • 2015 AHR Innovation Award Winner.
NPE‑S open

2 inch PVC venting up to 60 feet
No need to cut new chases. Low exhaust gas temps allows use of PVC, CPVC, System 636 and polypropylene vent systems, saving time and money.

Field gas convertability
Negative pressure gas valve and a dual venturi system allows for easy field convertibility from NG to LP operation.
Callout unit

Dual stainless steel heat exchangers
Resists corrosion better than copper to provide longer life.

1/2 inch gas pipe capability up to 24 feet
Cut installation time, not new gas lines for retrofit applications.

When it comes to water heater performance it’s all about the output

The NPE-S condensing tankless water heaters are so efficient that they outperform much larger capacity non-condensing competitors. More output for the money, lower installation costs and lower operating costs for customers makes it a smart choice.



Front Panel Control 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.

Cascading up to 16 units and
common vent up to 8 units

Cascade up to 16 units with Navien Ready-Link® technology.


With Navien's Ready-Link® cascading technology, when a unit gets up to 80% capacity the next unit will turn on to help meet requirements. The flow on demand ratio will continue until all 16 units are generating hot water as needed. The Navien cascading system also balances out the workload of each unit for longer life.

Common vent
up to 8 units

Building penetrations are reduced with Navien's common venting feature.

Max Input: 120,000 BTU/H
Indoor or outdoor wall-hung
Max Input: 150,000 BTU/H
Indoor or outdoor wall-hung
Max Input: 180,000 BTU/H
Indoor or outdoor wall-hung
Max Input: 199,900 BTU/H
Indoor or outdoor wall-hung

Optional Wi-Fi remote control system


NaviLink makes it easy to communicate with your Navien systems anywhere internet service is accessible. The NaviLink module attaches easily to any new or existing* Navien tankless water heater, combi‐boiler and boiler.

* Existing installations may require the purchase of a new main PCB and front control panel. Units produced on or after 2-22-16 will be compatible out of the box.

Available for Download
on IOS or Android

Ready-Link® Manifold System for mounting on a wall or rack

  • Simply no waiting for factory racks
  • Simply easy to install...same day.
  • Simply more profitable.
  • Simply visit your local Navien wholesaler and pick up everything you need.
NPE Sizing Calculator
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Product Serial number is 15-16 digits and can be found either on the right side of the box or the back of the front cover.
Navien, Inc. Technical Customer Service Department

Training Information

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