Navien NPE-A2 Series
Premium Condensing Tankless Water Heater with Built-in Recirculation
Navien NPE-A2 -- The Gold Standard in Tankless Water Heating
The Navien NPE-A2 is our most installed and most recommended tankless water heater for Long Island homeowners. It combines Navien's advanced condensing technology with a built-in recirculation pump and 0.5-gallon buffer tank, delivering near-instant hot water at every faucet in your home without the typical wait time that comes with other tankless systems.
With an energy factor of up to 0.97, the NPE-A2 wastes almost nothing. It heats water only when you need it, eliminating the standby energy losses of traditional tank water heaters. For most Long Island families, that translates to 30% to 40% lower water heating costs compared to a conventional tank heater.
At All Island Comfort, we specialize exclusively in Navien products and have installed hundreds of NPE-A2 units across Nassau and Suffolk County. We handle everything from the initial site assessment through final testing, and every installation includes a condensate neutralizer, PVC venting, gas line connection, and full system configuration.
The NPE-A2 is available in four sizes -- 150,000, 180,000, and 199,900 BTU -- so there is a model for every household, from a one-bathroom apartment to a four-bathroom family home. Each size shares the same compact 17.3" x 27.4" footprint and mounts on the wall, freeing up the floor space that a traditional 40 or 50 gallon tank heater would occupy in your basement, utility closet, or garage.
Navien backs the NPE-A2 with a 15-year heat exchanger warranty, 5 years on parts, and 1 year on labor. With proper annual maintenance -- including heat exchanger flushing and filter cleaning -- the unit is designed to last 20 years or more. That is roughly double the lifespan of a conventional tank water heater, making the NPE-A2 a strong long-term investment for Long Island homeowners.
Industry-leading efficiency
Built-in recirc pump + buffer tank
Monitor and control from your phone
Heat exchanger coverage
Inside the NPE-A2
2" PVC Up to 75 Feet
1/2" gas up to 24 feet -- affordable PVC venting eliminates the need for expensive stainless steel
High Efficiency Up to 0.95 UEF
Up to 15:1 turndown ratio for precise temperature control across a wide range of flow rates
Dual Stainless Steel Heat Exchangers
Durable dual heat exchangers maximize heat transfer and resist corrosion for long-lasting performance
EZNav™ Multi-Line Control
Built-in intuitive software with multi-line display for easy setup, diagnostics, and temperature adjustment
NPE-A2 Full Specifications
| Type | Condensing Tankless Water Heater |
|---|---|
| Placement | Indoor / Outdoor |
| Energy Factor | Up to 0.97 EF / 0.95 UEF |
| Turndown Ratio | Up to 15:1 |
| BTU Input Range | 13,300 -- 199,900 BTU/h (NPE-240A2) |
| Max Flow Rate (35°F rise) | 11.2 GPM (NPE-240A2) |
| Max Flow Rate (45°F rise) | 8.7 GPM (NPE-240A2) |
| Max Flow Rate (67°F rise) | 5.6 GPM (NPE-240A2) |
| Recirculation Pump | Built-in with 0.5-gallon buffer tank |
| Wi-Fi Control | NaviLink compatible |
| Venting | 2" PVC up to 75 ft; 1/2" gas up to 24 ft |
| Heat Exchangers | Dual stainless steel |
| Control Panel | EZNav™ multi-line with intuitive software |
| Condensate Neutralizer | Required |
| Gas Types | Natural Gas or Liquid Propane |
| Gas Pressure (NG) | 3.5" WC minimum |
| Gas Pressure (LP) | 11.0" WC minimum |
| Gas Line Size | 3/4" minimum |
| Electrical | 120V, 60Hz dedicated outlet |
| Dimensions (W x H x D) | 17.3" x 27.4" x 13.2" |
| Weight (NPE-240A2) | 77 lbs |
| Heat Exchanger Warranty | 15 years |
| Parts Warranty | 5 years |
| Labor Warranty | 1 year |
| Installed From | $7,900 |
Available NPE-A2 Sizes
The NPE-A2 is available in four sizes to match different household demands. All sizes share the same dimensions and include the built-in recirculation pump.
NPE-150A2
- 8.4 GPM at 35°F rise
- 6.5 GPM at 45°F rise
- Weight: 73 lbs
Best for: 1-2 bathroom homes
NPE-180A2
- 9.8 GPM at 35°F rise
- 7.6 GPM at 45°F rise
- Weight: 73 lbs
Best for: 2-3 bathroom homes
NPE-210A2
- 10.1 GPM at 35°F rise
- 7.8 GPM at 45°F rise
- Weight: 77 lbs
Best for: 3 bathroom homes
NPE-240A2
- 11.2 GPM at 35°F rise
- 8.7 GPM at 45°F rise
- Weight: 77 lbs
Best for: 3-4+ bathroom homes
Not sure which size is right? Our technicians will measure your home's hot water demand during a free site assessment and recommend the correct unit. Call (631) 591-2289 to schedule.
Why the NPE-A2 Is Our Top Recommendation
Built-in Recirculation Pump
The NPE-A2's integrated recirculation pump and 0.5-gallon buffer tank keep a small amount of hot water ready at all times. When you turn on a faucet, hot water arrives in seconds instead of the 30 to 60 second wait that is common with other tankless systems. You can set the recirculation schedule to run during peak usage hours to save energy.
Industry-Leading Efficiency
At up to 0.97 energy factor, the NPE-A2 converts 97% of the gas it burns into hot water. Traditional tank heaters typically achieve 0.60 to 0.67 energy factor, and even non-condensing tankless units only reach 0.82. That efficiency difference adds up to significant savings on your Long Island utility bills month after month.
NaviLink Wi-Fi Control
Connect your NPE-A2 to your home Wi-Fi and control it from anywhere using the NaviLink app. Adjust water temperature, set recirculation schedules, receive maintenance reminders, and monitor system diagnostics from your phone. If an error code appears, you can check it immediately without going to the unit.
Affordable PVC Venting
Because the NPE-A2 is a condensing unit, exhaust temperatures are low enough to use standard PVC pipe for venting -- no expensive stainless steel required. PVC venting runs up to 60 feet (concentric) or 150 feet (two-pipe), giving our installers flexibility to place the unit where it works best for your home.
ComfortFlow Technology
Navien's ComfortFlow system uses the internal buffer tank and a built-in mixing valve to eliminate the "cold water sandwich" effect -- that brief burst of cold water between hot water draws that affects some tankless systems. The result is consistent, comfortable water temperature every time you use a faucet.
15-Year Heat Exchanger Warranty
Navien stands behind the NPE-A2 with a 15-year warranty on the stainless steel heat exchanger, 5 years on all other parts, and 1 year on labor. Professional installation by a certified technician (like our team at All Island Comfort) is required to keep the warranty valid.
Control Your NPE-A2 from Anywhere
The NPE-A2 connects to your home Wi-Fi through NaviLink, giving you full control of your water heater from your phone -- whether you are home, at work, or traveling. Set the perfect temperature, program recirculation schedules to match your family's routine, and receive real-time maintenance alerts so you never miss a service interval.
If an error code appears, you can check it immediately from the app instead of walking to the unit. NaviLink also tracks system performance data over time, helping our technicians diagnose issues faster when you call for service.
How the NPE-A2 Compares
See how the NPE-A2 stacks up against the other Navien residential models. For a full breakdown, visit our complete model comparison page.
| Feature | NPE-A2 | NPE-S2 | NHW-AI | NHW-AE |
|---|---|---|---|---|
| Type | Condensing | Condensing | Non-Condensing | Non-Condensing |
| Energy Factor | Up to 0.97 | Up to 0.96 | Up to 0.82 | Up to 0.82 |
| Max Flow Rate | 11.2 GPM | 11.2 GPM | 9.5 GPM | 9.5 GPM |
| Recirculation | Built-in | Optional | No | No |
| Wi-Fi Control | Yes | Yes | No | No |
| Venting | PVC | PVC | Stainless Steel | Not Required |
| Neutralizer Needed | Yes | Yes | No | No |
| Installed From | $7,900 | $7,800 | $4,540 | $4,040 |
What Is Included with NPE-A2 Installation
Navien NPE-A2 Unit
Factory-new unit in the size recommended for your home.
PVC Venting
Concentric or two-pipe PVC venting installed per Navien specs.
Gas Line Connection
Professional 3/4" gas line connection with pressure testing.
Condensate Neutralizer
Required for all condensing models. Installed and pH-tested.
Electrical Connection
Dedicated 120V outlet for controls, ignition, and recirc pump.
Water Lines + Isolation Valves
Hot and cold connections with service valves for future maintenance.
Full System Testing
Every fixture tested, gas pressure verified, leak-checked, error-free startup.
Warranty Registration
We register your unit with Navien to activate the full manufacturer warranty.
Explore Other Navien Models
NPE-S2 Series
High-efficiency condensing with optional recirculation. Up to 0.96 EF. Starting at $7,800 installed.
View NPE-S2 Non-CondensingNHW-AI Series
Indoor non-condensing, budget-friendly entry into tankless. Up to 0.82 EF. Starting at $4,540 installed.
View NHW-AI Non-CondensingNHW-AE Series
Outdoor non-condensing with weatherproof housing. No venting needed. Starting at $4,040 installed.
View NHW-AENPE-A2 Frequently Asked Questions
What makes the NPE-A2 different from the NPE-S2?
The biggest difference is the built-in recirculation pump. The NPE-A2 includes an integrated pump and 0.5-gallon buffer tank that delivers near-instant hot water at your faucet. The NPE-S2 offers similar efficiency (0.96 vs 0.97) but the recirculation pump is optional and sold separately. If instant hot water matters to you, the NPE-A2 is the better choice.
What size NPE-A2 do I need for my home?
For 1-2 bathroom homes, the NPE-150A2 is typically sufficient. For 2-3 bathrooms, the NPE-180A2 or NPE-210A2 works well. For 3-4+ bathrooms or homes with high simultaneous demand, the NPE-240A2 at 199,900 BTU and 11.2 GPM provides the most capacity. Our technicians will measure your home's actual demand during a free site assessment. Call (631) 591-2289 to schedule.
Does the NPE-A2 require a condensate neutralizer?
Yes. As a condensing unit, the NPE-A2 produces acidic condensate (pH 3-5) that must be neutralized before entering your drain system. Long Island building codes require this. We include condensate neutralizer installation with every NPE-A2 installation at no additional charge.
How much does a Navien NPE-A2 cost installed?
NPE-A2 installation starts at $7,900 installed, which includes the unit, gas line connection, PVC venting, condensate neutralizer, electrical connection, water lines, full system testing, and warranty registration. The final price depends on the unit size and any additional gas line or venting work your home may need. We provide free on-site estimates with transparent pricing. Financing is available starting at 0% APR through Wisetack.
Can the NPE-A2 be installed outdoors?
Yes, the NPE-A2 can be installed outdoors with an optional outdoor installation kit. However, for Long Island's climate with cold winters, indoor installation is generally preferred for this model. If outdoor installation is important to you, the NHW-AE Series is specifically designed for outdoor use with built-in weatherproof housing and freeze protection.
How long does NPE-A2 installation take?
A standard NPE-A2 installation typically takes 4 to 6 hours. If you are converting from a traditional tank water heater, it may take 6 to 8 hours due to gas line modifications and new venting runs. Our team completes the work in a single visit, and your new system will be fully operational before we leave. Learn more about the full installation process.
What maintenance does the NPE-A2 need?
Navien recommends annual maintenance that includes flushing the heat exchanger with a vinegar solution (about 45 minutes), cleaning the inlet water filter, inspecting the PVC venting, and checking the condensate neutralizer media. Our repair and maintenance team handles all of this and can set up a recurring service schedule after installation.
Does the NPE-A2 work with propane?
Yes. The NPE-A2 is available in both Natural Gas (NG) and Liquid Propane (LP) configurations. The LP version requires different gas pressure settings (11.0" WC vs 3.5" WC for natural gas), which we configure during installation. Both versions deliver the same performance and efficiency.
Ready to Install an NPE-A2?
Get a free, no-obligation estimate for your Navien NPE-A2 installation. Our certified technicians serve all of Nassau and Suffolk County and are available 24/7. Check our coupons page for current specials.
Have questions? Check our FAQ page for more answers about Navien water heaters.