Description
Navien NFC-H Series175K BTU Condensing Combi-Boiler
Pairs hydronic space heating with on-demand domestic hot water at 5.4 GPM and a 15:1 DHW turndown ratio. The fire tube heat exchanger and 4.5 gallon water volume smooth out temperature swings in radiant floor and baseboard systems, and the burner modulates deep enough to keep the unit running steadily on mild days rather than short-cycling.
Vents through a sidewall in PVC, CPVC or polypropylene and needs no chimney. The boiler runs on natural gas or propane, mounts on the wall in a compact cabinet, and is ENERGY STAR qualified and suitable for residential and light commercial work.
Technical specification
| Type | Condensing combi-boiler (space heating + DHW) |
|---|---|
| Input | 175,000 BTU |
| Domestic hot water flow | 5.4 GPM |
| DHW turndown ratio | 15:1 |
| Heat exchanger | Fire tube |
| Water volume | 4.5 gallons |
| Efficiency | 95% AFUE |
| Venting | Direct-vent sealed combustion, sidewall, PVC/CPVC/polypropylene |
| Fuel | Natural gas or propane |
| Cabinet dimensions | 33-1/2 in. tall × 17-3/10 in. deep, wall-mounted |
| Certification | ENERGY STAR qualified |
| Use | Residential and light commercial |
Installation notice
Installation must be performed by a licensed gas heating contractor.
Navien NFC-H Series combi-boiler. Follow the installation manual, local gas and plumbing codes, and manufacturer instructions.
