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The Navien NPE-240A2 features exclusive ComfortFlow® Technology with a built-in recirculation pump and buffer tank. Say goodbye to the “cold water sandwich” and waiting for hot water.
Tankless Water Heater Services in Greater Toronto Areas and Southern Ontario
The Navien NPE-240A2 is Navien’s most powerful and best-selling condensing tankless water heater, perfect for large households that need maximum hot water capacity. With 199,000 BTU, up to 11.2 GPM, and Navien’s patented ComfortFlow® built-in recirculation, this unit delivers continuous hot water even when multiple fixtures run at the same time.
Engineered for Canadian homes and cold-climate performance, the NPE-240A2 offers super high efficiency (0.95 UEF), advanced stainless-steel heat exchangers, and long-term durability. Whether you’re replacing a traditional tank or upgrading an older tankless system, the NPE-240A2 provides unmatched reliability and energy savings.
Installed professionally by 4Most Energy’s certified Navien technicians, this unit includes full venting, gas line sizing, and commissioning.
Warranty: 15-Year Heat Exchanger, 5-Year Parts, 2-Year Recirculation Pump, and Up to 10-Year Extended Labour Warranty.
No hidden fees. Just accurate math based on your home’s specs.
Is this the right unit for your home? The NPE-240A2 is the powerhouse solution for larger households and high-demand applications.
| Specification | Value |
|---|---|
| Model | Navien NPE-240A2 |
| Type | Condensing Tankless Water Heater |
| Fuel | Natural Gas |
| BTU Input | 199,000 |
| Max Flow Rate | 11.2 GPM |
| UEF Efficiency | 0.95 (Super High Efficiency) |
| Venting | 2" or 3" PVC, CPVC: System 363 |
| Installation | Indoor wall-mounted |
| Recirculation | Built-in ComfortFlow® pump |
| Warranty | 15-year HX / 5-year parts / 4Most labour |
Many manufacturers list flow rates based on warm southern climates. At 4Most Energy, we size for the worst-case scenario: a freezing February morning in the GTA with groundwater temperatures around 40°F.
The Navien NPE-240A2 is a powerhouse, but physics still applies. Here is what you can realistically expect:
| Temp Rise | Flow Rate (GPM) | Flow Rate (l/m) | Typical Application Scenario |
|---|---|---|---|
| 35°F (19.4°C) | 11.2 GPM | 42.4 l/m | Summer Inlet (75°F) -> Hot (110°F) |
| 40°F (22.2°C) | 9.8 GPM | 37.1 l/m | High Capacity Summer Usage |
| 45°F (25.0°C) | 8.7 GPM | 32.9 l/m | |
| 50°F (27.8°C) | 7.8 GPM | 29.5 l/m | |
| 55°F (30.6°C) | 7.1 GPM | 26.9 l/m | |
| 60°F (33.3°C) | 6.5 GPM | 24.6 l/m | |
| 65°F (36.1°C) | 6.0 GPM | 22.7 l/m | |
| 70°F (38.9°C) | 5.6 GPM | 21.2 l/m | Typical GTA Winter Shower (110°F) |
| 75°F (41.7°C) | 5.2 GPM | 19.7 l/m | |
| 80°F (44.4°C) | 4.9 GPM | 18.5 l/m | GTA Winter High Heat (120°F) |
| 85°F (47.2°C) | 4.6 GPM | 17.4 l/m | |
| 90°F (50.0°C) | 4.4 GPM | 16.7 l/m | |
| 100°F (55.6°C) | 3.9 GPM | 14.8 l/m | Commercial / Sanitizing Temp |
| 110°F (61.1°C) | 3.6 GPM | 13.6 l/m | |
| 120°F (66.7°C) | 3.3 GPM | 12.5 l/m | |
| 130°F (72.2°C) | 3.0 GPM | 11.4 l/m | |
| 140°F (77.8°C) | 2.8 GPM | 10.6 l/m |
Based on the chart above (approx. 70°F rise in winter), here is what the NPE-240A2 can handle simultaneously:
| Simultaneous Usage Scenario | Performance Status |
|---|---|
| 2 Showers + 1 Faucet | Perfect Performance. Endless hot water with zero pressure drop. |
| 3 Standard Showers | Excellent. Capable of running three 2.0 GPM showerheads simultaneously. |
| 1 Rain Shower + 1 Standard Shower | Good. Handles high-volume luxury fixtures well. |
| 2 Showers + Laundry + Dishwasher | Passable. You may notice a slight pressure drop, but the water will stay hot. |
| 4+ Simultaneous Showers | Limit Reached. We recommend cascading two units for this demand. |
While this is the best-selling unit in North America, it is not the perfect fit for every single home.
1. You Live in a Small Condo or 1-Bathroom Home: The NPE-240A2 is overkill for a property with only 1 bathroom or less than 1,200 sq. ft. You would be paying for capacity you will never use.
2. You Have Massive "Car Wash" Showers: If your custom home features a master spa with 3+ body sprays, a massive rain head, and a handheld wand running simultaneously (Totaling 8+ GPM in one shower), a single NPE-240A2 cannot keep up in winter.
3. Your Gas Meter is Undersized: While the NPE-240A2 works on 1/2" gas lines (up to 24 feet), the total BTU load of your home (Furnace + Fireplace + Range + Dryer + Tankless) must not exceed your gas meter's capacity.
Every Navien NPE-240A2 tankless water heater comes with one of the strongest warranties in the industry:
15-Year Heat Exchanger Warranty
Premium stainless-steel dual heat exchangers designed for long lifespan and corrosion resistance.
5-Year Parts Warranty
Covers internal components, sensors, valves, controls, and electronics.
All professional installations by 4Most Energy include:
1-Year Labour Warranty (standard)
Full coverage on installation workmanship, adjustments, and commissioning.
Add 4Most Protect for long-term peace of mind:
4Most Energy is a Certified Navien Installer.
This means:
✔ We can file and process Navien warranty claims
✔ Faster response times
✔ Direct access to Navien tech support
✔ No third-party complications
Your warranty always remains valid with 4Most Energy because we install the system to Navien standards
To keep your Navien NPE-240A2 performing at its best, 4Most Energy recommends:
A technician checks:
Combustion settings
Fan motor
Sensors
Burner condition
Exhaust and venting
Gas pressure calibration
Lime and mineral buildup can reduce flow rate and efficiency.
Frequency depends on local water hardness.
Ensures proper water flow and prevents internal wear.
For homes using the ComfortFlow® feature regularly.
✔ Keeps efficiency at 95%+
✔ Extends lifespan to 15–20 years
✔ Prevents unexpected breakdowns
✔ Protects warranty
✔ Reduces gas consumption
4Most Energy provides annual service plans and reminders, so you never miss a maintenance cycle.
Navien’s patented ComfortFlow® system is the first to include a buffer tank, recirculation pump, and fine-tuned controls in a tankless water heater. This resolves the cold-water sandwich effect and issues of minimal flow rates commonly found in other tankless water heaters.
Designed for the Navien NPE-A Series
Stops recirculation automatically at 95°F (35°C)
Works with Navien HotButton® for demand-style recirculation
Kit #30022965A includes the valve (PFFW-SXX-001) and two flexible hoses with adapters
Answered by 4Most Energy Experts
The Navien NPE-A2 Series includes three sizes designed for different home demands:
NPE-180A2 → 150,000 BTU • Up to 8.4 GPM • Ideal for small–medium homes (1–2 bathrooms)
NPE-210A2 → 180,000 BTU • Up to 10.1 GPM • Great for medium homes (2–3 bathrooms)
NPE-240A2 → 199,000 BTU • Up to 11.2 GPM • Best for large homes (+ 3 bathrooms) All models feature Navien’s built‑in ComfortFlow® recirculation pump + buffer tank.
Yes. All models in the NPE-A2 Series include Navien’s ComfortFlow® pump and an integrated buffer tank for faster hot water and reduced water waste.
The buffer tank minimizes temperature fluctuations, eliminates the “cold-water sandwich,” and stabilizes hot-water delivery during intermittent use.
4Most Energy recommends:
Annual inspection
Descaling every 2–3 years
Cleaning inlet filters once a year Routine maintenance protects efficiency and warranty coverage.
Yes. The NPE-A2 Series can be paired with hydronic air handlers, allowing the system to provide both domestic hot water and forced-air home heating.
Yes. We provide flexible financing options:
3-month no-payment
12-month equal payments
24-month equal payments
60-month low-monthly plans
Yes. Homes with a dedicated return line benefit from ultra-fast, energy-efficient recirculation using the built-in ComfortFlow® pump.
You can still enjoy fast hot water using the NaviCirc® Valve, which uses existing hot and cold water lines to create a recirculation path without additional plumbing.
Ideal for older homes
Works automatically at ~95°F (35°C)
Compatible with Navien HotButton®
Perfectly designed for the NPE-A2 Series
We provide full installation and service across Ontario, including: Toronto, North York, Scarborough, Etobicoke, Mississauga, Brampton, Vaughan, Richmond Hill, Markham, Newmarket, Aurora, Hamilton, Burlington, Oakville, Guelph & Kitchener-Waterloo.
Navien parts are widely available in Ontario through certified distributors. As a Navien-certified installer, 4Most Energy can source parts quickly for repairs and warranty service.
You can extend coverage up to 10 years with 4Most Energy’s protection plans, which include discounted maintenance and zero labour fees for repairs.
4Most Energy is a certified Navien installer with 10+ years of tankless experience, offering:
Proper sizing and gas-line evaluation
Professional installation and commissioning
Ontario-wide service
Extended labour warranties
Fast access to Navien parts and support We ensure your Navien NPE-A2 system performs at its highest efficiency.
Toronto, Markham, Richmond Hill, Vaughan, Aurora, Newmarket, Scarborough, Brampton, and Mississauga.
Extended Service Area: Stouffville, Oshawa, Barrie, Orangeville, Hamilton, St. Catharines, Guelph, Kitchener.
