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NPE-A2 Advanced

Condensing Tankless Water Heater

Navien NPE-A2 series condensing tankless water heater

Navien NPE-A2: simply a smarter hot water system for today's lifestyles

Plumber standing in front of cascading NPE-A2 condensing tankless water heaters with common venting
Homeowner standing in front of wall-mounted NPE-A2 condensing tankless water heater in closet

Navien...the proven leader in condensing tankless, makes it even easier to install and set up with the new NPE-A2 series


2" PVC up to 75 feet and 1/2" gas up to 24 feet


High efficiency up to 0.95 UEF and up to 15:1 TDR

Navien NPE-A2 condensing tankless water heater with cover removed and interior components labeled


Durable dual stainless steel heat exchangers


EZNav™ multi-line control with built-in intuitive software

tankless water heater with built-in recirculating pump as part of Navien’s ComfortFlow system

Built-in recirculation system

Navien’s patented ComfortFlow® system is the first to include a buffer tank, recirculation pump and fine-tuned controls into a tankless water heater, resolving the cold-water sandwich effect* and issues of minimal flow rates commonly found in other tankless water heaters.

* The “cold-water sandwich effect” is the undesired introduction of cold water into the hot water supply line on occasions of frequent on/off operations. (Measure Guideline : Transitioning to a Tankless Water heater, DOE, Sept.2012).


The built-in recirculation pump allows the NPE-A2 tankless water heaters to recirculate water through an external recirc line or through existing supply lines while using NaviCirc®, without the need for external pumps or controls.

Illustration showing tankless water heater recirculation pump and supply lines to multiple fixtures
Navien tankless water heater with backlit control panel

Multi-line control with built-in intuitive software 

Navien’s new backlit EZNav™ control panel uses simple text and icons to make set up, operation status and troubleshooting faster and easier than ever before.

  • 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 32 units and common vent up to 12 units

5 Navien tankless water heaters installed as a cascading system with common venting

Cascade up to 32 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 32 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 12 units

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

NPE-A2 Models

Max Input: 150,000 BTU/h
Indoor or outdoor wall-hung

ComfortFlow® Technology

Navien NPE-180A2 condensing tankless water heaters
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Max Input: 180,000 BTU/h
Indoor or outdoor wall-hung

ComfortFlow® Technology

Navien NPE-210A2 condensing tankless water heaters
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Max Input: 199,900 BTU/h
Indoor or outdoor wall-hung

ComfortFlow® Technology

Navien NPE-240A2 condensing tankless water heaters
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Tankless water heater recirculating pump used to circulate hot water for hydronic air handler

H2Air Kit optional combination space
heating and domestic hot water system

The H2Air Kit utilizes the NPE-A2 pump to circulate the hot water for the hydronic air handler. This removes the need to purchase an additional circulator for the heating system.

Designed for retrofit and new construction, the Navien H2Air Kit™ includes an add-on controller to integrate space heating and DHW between any NPE-A2 series tankless water heater and a hydronic air handler.

Learn more about H2Air

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

Ready-Link manifold system used to mount Navien tankless water heaters on racks or on a wall
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