Revolutionize Your Hot Water Experience with Navien NPE-240A2 Tankless Water Heater
The Ultimate Solution for Your Emergency Plumbing and Water Heating Needs
At EmergencyPlumbing.biz, 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: EmergencyPlumbing.biz 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 EmergencyPlumbing.biz, 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 EmergencyPlumbing.biz. 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.
NPE-240A2
HIGH EFFICIENCY CONDENSING TANKLESS WATER HEATER
- 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 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.
| Navien Tankless |
179.0 therms $195* |
|---|---|
| Other Tankless |
228 therms $249 |
| 50 Gallon Tank |
293 therms $319 |
| 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 |
|
| 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.
Here's supplementary content for the Navien NPE-240A2 page — insert after the Specifications table, before the "A leader in condensing technology" Navien company paragraph:
Understanding the NPE-240A2's Real-World Performance
Why Flow Rate Changes with Temperature Rise
The three flow rate figures in the specs — 11.2 GPM at 35°F rise, 8.7 GPM at 45°F rise, and 5.6 GPM at 67°F rise — aren't inconsistent numbers; they reflect a fundamental tankless water heater principle: the more you need to raise incoming water temperature, the lower your maximum simultaneous flow rate becomes. In practice, this means:
- Summer months — with warmer incoming groundwater, you'll see flow rates closer to the 11.2 GPM figure, supporting more simultaneous fixtures
- Winter months — with colder incoming water requiring a larger temperature rise (closer to 67°F rise), maximum flow capacity drops toward the 5.6 GPM figure
This is worth understanding when sizing a tankless unit for year-round Illinois use, since a unit that comfortably handles multiple showers in July may need more careful fixture planning during a cold January.
ComfortFlow Technology: Solving the "Cold Water Sandwich"
Traditional tankless water heaters have a well-known quirk: if you turn hot water on, off, then on again quickly, a brief slug of cold water can pass through before hot water resumes — the "cold water sandwich" effect. The NPE-240A2's patented ComfortFlow system addresses this directly by integrating a buffer tank, recirculation pump, and fine-tuned controls into the unit itself — the first tankless design to combine all three, according to the manufacturer. This gives more immediate, consistent hot water delivery than tankless units without this feature.
Understanding the Operating Cost Comparison
The manufacturer's cited operating cost comparison — Navien tankless at 179 therms/$195 vs. other tankless units at 228 therms/$249, vs. a 50-gallon tank at 293 therms/$319 — illustrates the general efficiency advantage tankless systems (and this unit specifically) have over traditional tank water heaters, largely due to eliminating the standby heat loss inherent in keeping a large tank of water hot around the clock. Actual savings for your household will vary based on usage patterns and local utility rates, but the relative efficiency gap is a useful benchmark.
Dual Venturi System: Better Combustion Control
The dual venturi design improves combustion control and turndown ratio compared to single-venturi systems, and specifically simplifies field gas conversions (switching between natural gas and propane) — a practical benefit if your fuel source needs differ from the factory default configuration.
Flexible, Cost-Effective Venting
Because the NPE-240A2 produces low exhaust gas temperatures, it can be vented using a range of materials — PVC (including economical schedule 40), CPVC, polypropylene, or stainless steel — up to 75 feet with 2" PVC venting. This flexibility can meaningfully reduce installation costs compared to units that require more expensive stainless steel venting exclusively.
1/2" Gas Pipe Capability: A Retrofit Advantage
The ability to run on 1/2" gas pipe up to 24 feet (subject to local code) is particularly useful for retrofit installations, since it can eliminate the need to install new, larger gas lines when replacing an older water heater — directly reducing both installation time and cost.
Cascading for Larger Demand
With the ability to cascade multiple units and common-vent up to 12, the NPE-240A2 scales beyond single-family residential use into larger homes, multi-family buildings, or light commercial applications where hot water demand exceeds what one unit can efficiently provide.
High-Elevation and Cold-Climate Reliability
Rated for operation up to 10,100 feet elevation on both natural gas and propane, and built with a full suite of safety devices (flame rod detection, high-limit switches, exhaust temperature sensors, vent installation detector), this unit is engineered for reliable operation across a wide range of installation environments — including the demands of Illinois winters.
Professional Installation Matters
Given the gas conversion options, venting material choices, and optional ComfortFlow recirculation configuration, professional installation ensures the unit is set up correctly for your specific home and usage patterns. Our licensed technicians will:
- Confirm gas line sizing and confirm compatibility with 1/2" pipe capability for retrofit installs
- Select and install appropriate venting material and routing
- Configure ComfortFlow recirculation, if desired, for faster hot water delivery
- Set up cascading configuration if your property requires multiple units
- Complete combustion testing and safety device verification
Frequently Asked Questions
Will this unit provide enough hot water for my whole family in winter?
It depends on your household's simultaneous fixture usage and incoming water temperature; our technicians can review your specific usage patterns and, if needed, recommend cascading multiple units for larger or high-demand households.
Does ComfortFlow increase my energy costs?
Yes, slightly — the manufacturer notes that energy consumption increases when the system is configured for recirculation mode, which is the tradeoff for eliminating wait time and the cold water sandwich effect.
Can this unit be installed outdoors?
Yes — it's rated for both indoor and outdoor wall-hung installation, giving installers flexibility based on your home's mechanical space and layout.
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