Navien NFB-399C Condensing Heating Boiler 399,000 BTU, 97.5% AFUE

Name: Navien NFB-399C Condensing Heating Boiler 399,000 BTU, 97.5% AFUE
Brand: Navien
SKU: ARZ-000402
Price: 1199.00 USD
Availability: InStock

$1,199

Free freight delivery in 2–4 business days

Ships from our dock in 0–1 business day. The carrier schedules your window.

5-year Geo Point Supply warrantyWhat’s covered
14-day free returnsHow returns work

Secure checkout · Prices in USD · Sales tax calculated at checkout where applicable

01 Overview

Navien NFB-399C Condensing Heating Boiler 399,000 BTU, 97.5% AFUE

The Navien NFB-399C is a wall-hung condensing heating boiler rated at 399,000 BTU/h with 97.5% AFUE, built for light commercial and large residential hydronic systems. Its stainless steel fire tube heat exchanger and 9.6 gallon water capacity deliver stable supply temperatures for baseboard, panel radiator and radiant floor loops, while the direct-vent sealed combustion design allows flexible PVC, CPVC or polypropylene venting through a sidewall or roof. The unit runs on natural gas and converts to propane in the field, operates on standard 120V power and is ASME H stamped, CSA 4.9 certified and ENERGY STAR qualified. Cascade control lets multiple NFB-C boilers stage together for larger plants, and the compact 25-1/10 in. wide by 32-4/5 in. tall cabinet frees valuable mechanical room floor space. Professional installation by a licensed heating contractor is required.

Highlights

399,000 BTU/h input with 97.5% AFUE condensing performance
Stainless steel fire tube heat exchanger, 9.6 gal water capacity
Direct-vent sealed combustion with sidewall or vertical venting
Natural gas with field-convertible propane operation
Cascade-ready for multi-boiler light commercial plants
ASME H stamped, CSA 4.9 certified and ENERGY STAR qualified
Wall-mount cabinet: 25-1/10 in. W x 32-4/5 in. H x 22-3/10 in. D
120V single-phase power with electronic ignition

Ownership

Sold by Geo Point Supply, an authorized Navien dealer
5-year Geo Point Supply warranty
Installation by a licensed gas, heating or plumbing contractor is required
Free freight delivery: Guaranteed LTL in 2-4 business days, or Expedited White Glove in 1-3

02 Specifications

Measured, in US units.

Confirm cutout, clearance and connection details with your installer.

Model: NFB-399C
Type: Heating boiler
Input: 399,000 BTU/h
Fuel: Natural gas, field convertible to propane
Efficiency: 97.5% AFUE
Condition: New
Warranty: 5-year Geo Point Supply warranty

03 Delivery

Free freight delivery, scheduled with you.

0–1 dayWe prepare your orderInspected, packed and handed to the freight carrier. Tracking by email.
SchedulingThe carrier calls youLarge appliances ship by LTL freight; the carrier books a delivery window with you.
2–4 daysDeliveredTo the curb or first dry area. Installation and haul-away are not included.

Before delivery day

Measure doorways, hallways and the installation space.
Check the outlet, circuit or gas connection listed in the specifications.
Inspect the appliance and packaging before signing, and note any damage.

Shipping & delivery details

04 Warranty & returns

Covered by us, from the day it arrives.

5-year Geo Point Supply warranty

Covers defects and malfunctions during normal household use. We repair, replace or refund, and we pay the shipping. Excludes drops, external water damage, misuse and cosmetic wear.

Full warranty