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Navien NPE-240S2 . Max Capacity: 199,000 BTU | 11.2 GPM (Max) High Capacity Tankless
The Powerhouse for Large Families.
The Navien NPE-240S2 (Standard Series) is the heavy lifter of the Navien lineup. Boasting a massive 199,900 BTU heating capacity, it delivers the same sheer volume of hot water as the top-tier commercial units but strips away the internal recirculation pump to save you money.
Is the "S2" Right for You? This unit is designed for Large Detached Homes (2,500+ sq. ft.) with standard plumbing. If you don't have a dedicated recirculation loop and simply want the most powerful tankless heater on the market to fill your soaker tub or run 3 showers at once, the NPE-240S2 is your perfect match.
No hidden fees. Just accurate math based on your home’s specs.
Don't Just Buy a Box—Invest in a Solution. The Navien NPE-240S2 is an advanced piece of engineering, but its performance depends entirely on the quality of the installation. Homeowners across Ontario trust 4Most Energy because we specialize in high-efficiency systems.
| Specification | Value |
|---|---|
| Model | Navien NPE-240S2 |
| 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, SS |
| Installation | Indoor wall-mounted |
| Recirculation | N/A |
| Warranty | 15-year HX / 5-year Parts / 1-year Labor |
We know Ontario winters are tough. Here is what the NPE-240S2 delivers when the ground is frozen.
Is this the right fit?
Real-World Winter Performance: Even in February with freezing inlet water, this beast churns out roughly 5 Gallons Per Minute.
| Temperature Rise Needed | Flow Rate (GPM) | Typical Use Case |
|---|---|---|
| 35°F Rise (Summer) | 11.2 GPM | Unlimited (4+ Showers) |
| 45°F Rise (Spring/Fall) | 8.7 GPM | 3 Showers + Laundry |
| 70°F Rise (Early Winter) | 5.6 GPM | 2 High-Flow Showers |
| 75°F Rise (Deep Winter) | 5.2 GPM | Ontario Winter Standard |
| 85°F Rise (Extreme Cold) | 4.6 GPM | Unstoppable Comfort |
To keep your Navien NPE-210S2 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.
✔ 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.
Every Navien NPE-240S2 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.
2-Year Warranty on Built-In Recirculation Pump
Ensures reliable performance over time.
All professional installations by 4Most Energy include:
1-Year Labour Warranty (standard)
Full coverage on installation workmanship, adjustments, and commissioning.
Optional Extended Labour Protection — Up to 10 Years
Add 4Most Protect for long-term peace of mind:
Priority service
Discounted maintenance
No labour charges for repairs
Annual system check options
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.
A simple 3-step process to get your Navien Boiler professionally installed anywhere in Ontario.
Answered by 4Most Energy Experts
The "S" stands for Standard. The primary difference is that the NPE-S2 Series does not have the built-in "ComfortFlow" recirculation pump and buffer tank found in the A2 Series. The S2 is more budget-friendly while delivering the exact same heating power (199,900 BTU) and efficiency (0.96 UEF).
No. Like a traditional water heater, there will be a standard wait time for hot water to travel from the utility room to your tap. If "instant" hot water at the faucet is a priority, we recommend the NPE-A2 Series.
No, the NPE-S2 Standard Series does not include a built-in pump. However, if your home is already equipped with a dedicated recirculation line and an external pump, 4Most Energy can successfully hook it up to your new NPE-S2 system during installation
If you don't have a dedicated return line, we strongly recommend going with the NPE-A2 Series (Advanced). We can install a NaviCirc® Valve (thermal crossover valve) under your furthest sink. This allows the NPE-A2 to use your existing cold water lines to create a recirculation path without any additional plumbing or tearing up walls.
Yes, it can. 4Most Energy can expertly configure this unit to supply hot water to a hydronic air handler for home heating. This application requires professional design and installation to ensure the heat exchanger is not overworked, mixing valves and pumps are adjusted correctly, and thermal expansion is managed. As long as it is installed correctly by our team, this is a highly effective and budget-friendly heating solution.
Yes, it can. 4Most Energy can expertly configure this unit to supply hot water to a hydronic air handler for home heating. This application requires professional design and installation to ensure the heat exchanger is not overworked, mixing valves and pumps are adjusted correctly, and thermal expansion is managed. As long as it is installed correctly by our team, this is a highly effective and budget-friendly heating solution.
Yes. We provide flexible financing options:
3-month no-payment
12-month equal payments
24-month equal payments
60-month low-monthly plans
4Most Energy recommends:
Annual inspection
Descaling every 2–3 years
Cleaning inlet filters once a year Routine maintenance protects efficiency and warranty coverage.
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.
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.
Toronto, Markham, Richmond Hill, Vaughan, Aurora, Newmarket, Scarborough, Brampton, and Mississauga.
Extended Service Area: Stouffville, Oshawa, Barrie, Orangeville, Hamilton, St. Catharines, Guelph, Kitchener.
