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Navien NFB-H
Model Number: NFB-H
NFB-H fire-tube heating-only boiler offers 95% AFUE in two sizes.
Technical Specifications
Source: manufacturer spec sheet · checked Sep 27, 2026
Prices depend on sizing, venting and piping in your home, so we quote every installation.
Sizing: the right size comes from a room-by-room heat-loss calculation, not the size of the old boiler or a rule of thumb. Oversized boilers short-cycle and waste fuel; steam systems are sized to the connected radiation instead. See how we approach boiler installation.
Home-Specific Operating Cost Review
No guaranteed annual savings or payback period
Historical Use
Fuel consumption and weather
Current Rates
Utility and delivered-fuel prices
System Design
Load, piping, controls, and temperatures
Full Specifications
- Model Number
- NFB-H
- Efficiency (AFUE)
- 95%
- Boiler Type
- Condensing Boiler
- Fuel
- natural gas/propane
- Venting
- PVC/CPVC/PP/SS
- BTU Input Range
- 13k - 200k BTU
- Domestic Hot Water
- indirect-ready
- In Production
- Yes
- Parts Warranty
- 5 years (single-family residential)
- Heat Exchanger Warranty
- 12 years full then prorated (residential)
Specifications sourced from the manufacturer spec sheet, checked Sep 27, 2026.
Ideal For
Homes sized for NFB-175H or NFB-200H with separate hot water
Expert Review: Navien NFB-H
NFB-H is a heating-only condensing fire-tube boiler, not a combi. Navien lists NFB-175H and NFB-200H, 95% AFUE and input spanning 13,300 to 199,900 BTU/h across the family. Domestic hot water requires separate equipment, perhaps an appropriately designed indirect tank. Choose a model from heat loss, distribution temperatures, gas supply and equivalent vent length. For qualifying single-family use, Navien lists one year labor, five years parts and exchanger coverage at no charge for 12 years followed by a prorated schedule. Do not assume a fixed utility rebate.
Key Features & Technology
Heating-only fire-tube design
95% AFUE family
Stainless-steel fire-tube exchanger
NFB-175H and NFB-200H sizes
Advantages
- High-output heating option
- Modulating burner
- Published coverage table
Considerations
- Separate domestic hot water required
- Exchanger terms become prorated
- Venting and water quality need review
Sizing & Installation Notes
Condensing boilers like the NFB-H reach their rated efficiency only when return water runs cool enough to condense flue gases. We check your radiation and design water temperatures so the unit actually condenses in your home, not just on the spec sheet.
Every Navien installation starts with a free in-home assessment covering the heat-loss calculation, venting and chimney condition, gas or oil supply sizing, and permit requirements for your town. Learn more about our boiler installation process, or see current rebate and incentive programs that may apply.
Warranty & Protection
Parts Warranty
5 years (single-family residential)
Heat Exchanger
12 years full then prorated (residential)
Our Guarantee
100% Satisfaction
All Navien boiler installations by Home+ Air & Heat include our 1-year workmanship warranty, covering labor and any installation-related issues.
Compare the Navien Lineup
| Model | Efficiency | BTU Range | Fuel | Heat Exchanger Warranty |
|---|---|---|---|---|
| NFB-H (this model) | 95% AFUE | 13k - 200k BTU | natural gas/propane | 12 years full then prorated (residential) |
| NCB-E | 95% AFUE | Various sizes available | — | 10 years (single-family residential) |
| NHB | 95% AFUE | Various sizes available | — | Before July 2018: 15 years; later prorated (residential) |
| NFB-C | 97.5% TE | Various sizes available | natural gas/propane | 12 years full then prorated residential; 10 years commercial |
| NFC-H | 95% AFUE | 13k - 200k BTU | natural gas/propane | 10 years (single-family residential) |
| NCB-H | 95% AFUE | 11k - 150k BTU | natural gas/propane | 10 years (single-family residential) |
| NHB-H | 95% AFUE | 8k - 150k BTU | natural gas/propane | Prorated schedule; see Navien warranty (residential) |
See the full Navien brand page for lineup context, or browse the Best Condensing Boilers guide to compare across brands.
Frequently Asked Questions
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