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Navien NPE-210A2 . Comfort Flow (Advanced Series) recirculation pump and Buffer Tank Built in. Max Capacity: 180,000 BTU | 10.1 GPM (Max)
The Navien NPE-210A2 is Navien’s most powerful and best-selling condensing tankless water heater, perfect for large households that need maximum hot water capacity. With 180,000 BTU, up to 10.1 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, commissioning, and a 1-year labour warranty (extendable to 10 years).
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.
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-210A2 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.
Factory-Trained Optimization: The NPE-210A2 features advanced ComfortFlow® technology that requires precise programming. Our technicians are factory-trained to configure the recirculation modes correctly, ensuring you actually get the "instant hot water" you paid for.
Maximum Rebate Eligibility: This unit boasts a 0.96 UEF rating, making it eligible for significant energy rebates. We handle the selection and documentation process to ensure you claim every dollar available to you.
Correct Sizing Guarantee: A "powerful" unit is useless if the gas lines or venting aren't up to code. We perform a full load calculation before installation to confirm the 180,000 BTU capacity is perfectly matched to your home's gas supply and water demand.
Protection for Your Investment: While the Navien features durable Stainless Steel heat exchangers, we protect that longevity further with professional descaling and maintenance plans, ensuring your warranty remains valid for the full 15 years.
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 (3–5 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.
A simple 3-step process to get your Navien Boiler professionally installed anywhere in Ontario.
