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Home » NAVIEN NPE 240 A2

Revolutionize Your Hot Water Experience with Navien NPE-240A2 Tankless Water Heater





The Ultimate Solution for Your Emergency Plumbing and Water Heating Needs


At, we're committed to offering the latest in water heating technology to ensure our customers enjoy endless hot water, energy savings, and unparalleled convenience. We proudly introduce the Navien NPE-240A2, a state-of-the-art tankless water heater designed to meet the demands of modern households efficiently and reliably.


Why Choose the Navien NPE-240A2 for Your Home? 


- Endless Hot Water Supply: Say goodbye to cold showers! The Navien NPE-240A2 ensures an endless supply of hot water on demand, making it perfect for families, high-demand households, or anyone tired of running out of hot water.


- Exceptional Energy Efficiency: With an ENERGY STAR® rating, the NPE-240A2 operates with remarkable efficiency, saving you money on utility bills and reducing your carbon footprint. Its advanced condensing technology captures additional heat lost by traditional heaters, providing superior energy savings.


- Compact, Space-Saving Design: Unlike bulky traditional water heaters, the Navien NPE-240A2's sleek, wall-mounted design frees up valuable floor space in your home. It's an ideal solution for emergency plumbing upgrades, especially in smaller living spaces.


- Advanced Features for Enhanced Performance: Equipped with Navien's exclusive ComfortFlow® technology, the NPE-240A2 eliminates cold water sandwiches and provides stable temperatures for a comfortable, consistent hot water experience.


- Easy Installation and Maintenance: specializes in the quick and efficient installation of Navien tankless water heaters, ensuring minimal disruption to your home. The NPE-240A2's intuitive design and diagnostic software also allow for easy maintenance and troubleshooting.


- Dedicated Support and Longevity: Backed by Navien's industry-leading warranty and supported by the expert team at, you can trust in the reliability and longevity of your NPE-240A2 tankless water heater.



Elevate Your Home with Navien's Cutting-Edge Technology


The Navien NPE-240A2 tankless water heater represents the pinnacle of water heating efficiency and convenience. Whether you're facing an emergency plumbing situation or planning a proactive upgrade, choosing the NPE-240A2 means enjoying the benefits of advanced technology, energy savings, and the peace of mind that comes with a dependable hot water solution.


Transform your water heating experience with the Navien NPE-240A2 through Our expert team is ready to provide you with a seamless installation and superior service, ensuring that your home enjoys the comfort and efficiency of Navien's leading tankless water heater technology. 




  • ½" gas pipe capable up to 24'
  • Field convertible gas system
  • Ultra condensing efficiency
  • Dual stainless steel heat exchangers
  • Low NOx emissions (20ppm)
  • SCH 40, 2" venting up to 75'
  • Cascading capable
  • EZNav multi-line control panel
  • Built-in HotButton control panel
  • Common vent up to 12 units



2" PVC venting up to 75 feet
Low exhaust gas temperatures allow use of PVC (including schedule 40 PVC), CPVC, polypropylene (rigid and flexible) and stainless steel venting saving time and costs.Vent Installation Detector (VID) for added safety.


Dual Venturi for field gas conversions. Dual Venturi system creates better combustion control and turndown ratio.


ComfortFlow® NPE-A2 built-in recirculation system
The patented ComfortFlow® system is the first to include a buffer tank, recirculation pump and fine-tuned controls into a tankless water heater.


Dual stainless steel heat exchanger-d-new

Dual stainless steel heat exchangers for added durability.



EZNav™ Multi-line control with built-in intuitive software.


1/2" gas pipe capability up to 24' (subject to local codes). Cuts installation time, no need to install new gas lines for retrofit applications.



Operating Cost

Navien Tankless

179.0 therms


Other Tankless

228 therms


50 Gallon Tank

293 therms





Item NPE-240A2
Heat Capacity (input) Natural gas 13,300 - 199,900 BTU/h (3.897 - 58.571 kWh)
Propane 13,300 - 199,900 BTU/h (3.897 - 58.571 kWh)
Efficiency ratings UEF (NG & LP) 0.95
Flow rate (DHW) 35°F temp rise 11.2 GPM (42.4 l/m)
45°F temp rise 8.7 GPM (32.9 l/m)
67°F temp rise 5.6 GPM (21.2 l/m)
Dimensions 17.3" W x 27.4" H x 13.2" D (43.9cm W x 69.6cm H x 33.5cm D)
Boiler weight 77 lbs (34.9 kg)
Installation type Indoor or outdoor wall-hung
Venting type Forced draft direct-vent
Ignition Electronic ignition
Water pressure 15-150 PSI (1.055-10.545 kg/cm2)
Natural gas supply pressure (from source) 3.5 " WC to 10.5 " WC (0.87 Kpa to 2.61 Kpa)
Propane gas supply pressure (from source) 8 " WC to 13 " WC (1.99 Kpa to 3.23 Kpa)
Natural gas manifold pressure (min-max) -0.03 " WC to -0.96 " WC (-0.0075 Kpa to -0.24 Kpa)
Propane gas manifold pressure (min-max) -0.02 " WC to -0.96 " WC (-0.005 Kpa to -0.24 Kpa)
Minimum flow rate 0.5 GPM (1.893 l/m), < 0.01 GPM (0.04 l/m) option*
Connection sizes Cold water inlet 3/4"
Hot water outlet size 3/4"
Gas inlet 3/4"
Power supply Main supply 120V AC, 60 Hz
Maximum power consumption 200 W (max 2 A), 350 W (max 4 A) with external pump connected
Materials Casing Cold rolled carbon steel
Heat exchangers

Primary heat exchanger: stainless steel
Secondary heat exchanger: stainless steel

Venting Exhaust 2" or 3" PVC, CPVC, approved polypropylene and stainless steel 2" or 3" special gas vent type BH (Class II, A /B/C)
Intake 2" or 3" PVC, CPVC, approved polypropylene and stainless steel 2" or 3" special gas vent type BH (Class II, A /B/C)
Vent clearances 0" to combustibles
High elevations 10,100 feet for both NG or LP gas. Please refer to Installation Manual for additional details and instructions.
Safety Devices Flame rod, APS, ignition operation detector, water temperature high limit switch, exhaust temperature high limit sensor, power surge fuse, burner high limit fuse, vent installation detector (VID)

*Available for NPE-A2 models configured in an optional ComfortFlow® recirculation mode. Energy consumption will increase when the system is configured for recirculation.



A leader in condensing technology


Since 2006, Navien, Inc. has become one of the fastest growing companies in the home comfort sector in North America and is now a leader in condensing technology, providing condensing tankless water heaters, combi-boilers, and boilers.* Navien's products possess state-of-the-art technology, high efficiency and reliable quality.


Navien has achieved international recognition for its sophisticated engineering and robust designs. Backed by parent company, KD Navien with more than thirty-five years of experience with advanced boiler and water heating technology, Navien will continue its mission to provide high quality products.


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