Navien NFB-175H Installation Manual

WARNING
If the information in these instructions is not followed exactly, a fire or explosion may result,
causing property damage, personal injury, or death.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
WHAT TO DO IF YOU SMELL GAS
●
Do not try to light any appliance.
●
Do not touch any electrical switch; do not use any phone in your building.
●
Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
●
If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency or the gas
supplier.
The installation must conform with local codes or, in the absence of local codes, the
National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane
Installation Code.
Keep this manual near this boiler
for future reference whenever
maintenance or service is required.
Installation Manual
NFB-H Condensing Boilers
Model
NFB-175H
NFB-200H

Navien NFB-175H Specifications

General

Model	NFB-175H
Heating Capacity	175, 000 BTU/h
Input (BTU/h)	175, 000 BTU/h
Efficiency (AFUE)	95%
Modulation Ratio	5:1
Fuel Type	Natural Gas
Gas Connection Size	3/4"
Vent Size (inches)	2"
Category	Condensing Boiler
Venting	2" PVC/CPVC