Navien NFC-250/175H Fire Tube Condensing Combi-Boiler, 175,000 BTU Heating, 5.4 GPM Hot Water

The Navien NFC-250/175H is a fire tube condensing combi-boiler for homes that want big heating capacity and serious hot water from one unit. It provides up to 175,000 BTU/h for space heating and 210,000 BTU/h for domestic hot water, good for up to 5.4 GPM at a 70°F rise. The patented stainless steel fire tube heat exchanger holds more water than a typical combi, so supply temperatures stay steady on radiant floors and baseboard loops.

• 175,000BTU/h heating input
• 210,000BTU/h DHW input
• 5.4 GPMat 70°F rise
• 15:1DHW turndown

Why it earns its place on the wall

• Fire tube heat exchanger. Patented stainless steel design with a larger water volume for stable temperatures and fewer cycles.
• Class-leading hot water. 5.4 GPM at a 70°F rise covers simultaneous showers in cold climates.
• Deep modulation on heating and 15:1 on hot water to match real loads.
• Built-in powered connections for up to three zone valves or pumps, and a Setup Wizard for faster commissioning.
• Cascade and common vent capable for larger installations.
• High-altitude approved to 10,100 ft.

Specifications

Good to know

• Gas appliances must be installed by a licensed professional following the manufacturer’s installation manual and local codes. Manufacturer warranty terms depend on professional installation and registration.
• Specifications are from the manufacturer. Check the current spec sheet and sizing guide before ordering.
• Large units ship by ground freight. You will receive tracking when your order leaves.
• Questions on sizing or venting? Call +1 901-563-1990 or email support@mouchllc.com before you buy.