Navien NPE-240A2 – Condensing Tankless Water Heater – 199,000 BTU
The Navien NPE-240A2 is a high-capacity, high-efficiency condensing tankless water heater engineered for residential and light commercial applications. With an input range of 13,300 to 199,900 BTU per hour and a Uniform Energy Factor of 0.95, it delivers up to 11.2 gallons per minute at a 35°F temperature rise. Its compact, wall-hung design allows for flexible indoor or outdoor installation and supports 2″ or 3″ venting for long runs, making it ideal for homes or businesses requiring reliable and continuous hot water.
This model features Navien’s patented ComfortFlow® system with a built-in recirculation pump and buffer tank to eliminate temperature fluctuations and minimize hot water wait time. Dual stainless steel heat exchangers enhance durability, while the EZNav™ control panel simplifies setup and operation. The NPE-240A2 supports cascading with up to 32 units and common venting with up to 12, and is field convertible for natural gas or propane use. With ultra-low NOx emissions and advanced safety features, it delivers efficient performance without sacrificing reliability.
Features
199,900 BTU/h input with 0.95 UEF
Flow rate: up to 11.2 GPM at 35°F rise
Dual stainless steel heat exchangers
Built-in ComfortFlow® recirculation pump and buffer tank
Field convertible gas system (NG or LP, kit included)
Low NOx emissions (20 ppm)
Indoor or outdoor wall-hung installation
EZNav™ multi-line control panel with built-in HotButton™
Cascading capable: up to 32 units
Common venting capable: up to 12 units
1/2″ gas line compatible up to 24 feet
2″ venting up to 75 feet, 3″ venting up to 150 feet
3/4″ NPT gas and water connections
Electronic ignition and VID safety feature
Applications
Residential homes with high hot water demand
Light commercial facilities needing continuous hot water
Retrofits or upgrades to high-efficiency systems
Indoor or outdoor wall-mounted installations
Cascade setups in multi-unit buildings or large households
 
Navien NPE-A2 simply a smarter hot water system for today’s life styles
Navien…the proven leader in condensing tankless, makes it even easier to install and set up with the new NPE-A2 series
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 to recirculate water either through an external recirc line or through existing supply lines while using NaviCirc®, without the need for external pumps or controls.
 
 
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.
 
PNAV000025