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The Navien NFC-250/175H, installed by 4Most Energy, is the most powerful combi boiler in Navien’s lineup, delivering 199,000 BTU heating and 210,000 BTU hot water with a 10.8 GPM max flow rate. Ideal for large homes up to 4,000 sq ft and high-demand heating and hot water.
Installed by 4Most Energy — 175,000 BTU Heating • 210,000 BTU Hot Water
The Navien NFC-250/175H is Navien’s most powerful residential condensing combi boiler, engineered to handle high-demand heating and hot-water applications in large homes or light-commercial spaces. Professionally installed and serviced by 4Most Energy, this unit provides unbeatable comfort, efficiency, and performance in one compact wall-mounted system.
Delivering up to 175,000 BTU/h of heating and 210,000 BTU/h for domestic hot water, the NFC-250/175H combines Navien’s premium stainless-steel heat exchanger, smart modulation, and advanced condensing technology to achieve an exceptional 95 % AFUE efficiency. It’s built to handle the toughest Ontario winters while maintaining consistent water temperature for multiple fixtures at once.
High output for large and multi-zone homes — dependable heating up to 175 k BTU.
Endless hot water with 210 k BTU capacity and steady flow (up to 10.8 GPM).
Stainless-steel heat exchanger ensures long-term reliability & corrosion resistance.
Smart modulating burner adapts automatically to demand, saving energy.
Wi-Fi ready (NaviLink™) + digital controls for easy remote monitoring.
Ultra-low NOx emissions for a cleaner, eco-friendly operation.
Ideal for large homes, duplexes, or light-commercial spaces up to ≈ 4,500 sq ft.
Supports up to 4 bathrooms with simultaneous hot-water usage.
Excellent for multi-zone radiant heating, radiators, air handlers, and mixed hydronic systems.
Handles high-heat-load buildings, basement suites, or add-on units with ease.
