Navien · Combi Boilers
Navien NFC-250/175H
Fire-tube condensing combi · 95% AFUE · 175k BTU
The fire-tube heat exchanger and wide modulation handle larger homes and high simultaneous hot-water demand without missing a beat.
95%
AFUE
Navien
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Why homeowners choose the Navien NFC-250/175H
The Navien NFC-250 is the top of the combi lineup — a fire-tube heat exchanger with wide 15:1 modulation that handles larger homes and high simultaneous hot-water demand without missing a beat.
- Up to 95% AFUE with a durable fire-tube heat exchanger
- 175,000 BTU output with 15:1 turndown for precise modulation
- Handles heat plus multiple hot-water fixtures at once
A good fit if…
- Larger homes with high heating loads
- Households with high simultaneous hot-water demand
- Homeowners who want the most capacity and modulation
Key specifications
- Efficiency
- Up to 95% AFUE
- Type
- Fire-tube combi
- Heating
- 175,000 BTU
- Turndown
- 15:1
Get a Quote on the Navien NFC-250/175H
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Why Choose Relica Comforts?
- Licensed & insured technicians
- Upfront pricing — no surprises
- 24/7 emergency service
- Free estimates on all installations
- 5.0 stars on Google
Frequently Asked Questions
In a fire-tube design the hot combustion gases pass through tubes surrounded by water. It tends to be durable and resist scaling, which is why Navien uses it on the higher-output NFC line.
It is the range between the boiler’s maximum and minimum output. A wide 15:1 turndown lets it run gently on low when demand is small and ramp up when needed — steadier comfort and better efficiency.
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