Navien NFB-C Series 399K BTU – High Efficiency – Condensing Heating Boiler
Navien

Navien NFB-C Series 399K BTU – High Efficiency – Condensing Heating Boiler

Boilers

$292.94Sales tax calculated at checkout

Ships from Orlando

Free tracked delivery · 3–5 business days after dispatch to most US addresses

Bundle & Save Mix & match anything under $550 · taken off in the cart, no code

Build a bundle

This item + any of these count toward Bundle & Save
2 items · 5% off$454.68$478.61
  • Free tracked delivery3–5 business days after dispatch to most US addresses; 5–8 to Alaska, Hawaii and US territories.
  • 30-day returnsUnused, in its packaging. Faulty or damaged on arrival, we pay the return; a change of mind, you do.
  • Secure checkoutPayment is handled and encrypted by Shopify Checkout.

Overview

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.

Good to know

When will it arrive?

Orders placed before 2:00 pm ET on a business day ship the same day from Orlando; Saturday orders before 1:00 pm ET go out that afternoon. After that, it ships the next business day.

Delivery takes 3–5 business days after dispatch to most US addresses, and 5–8 to Alaska, Hawaii and US territories.

Can I return it?

Yes — tell us within 30 days of delivery and send it back unused, in its packaging, for a full refund. If it is faulty, damaged in transit or not as described, we pay the return; if you have changed your mind, the return shipping is yours, and we quote it before anything is booked.

Read the full returns policy

How does Bundle & Save work?

Every item marked Bundle & Save counts (single items under $550), and you can mix them: 2 items save 5%, 3 save 10%, 5 or more save 15%. The saving is taken off automatically in the cart — there is no code to enter.

Do I need to be in for the delivery?

Orders over $150 ship with signature on delivery, so a missing parcel can be claimed. Your tracking number is emailed the moment the label prints.

Navien NFB-C Series 399K BTU – High Efficiency – Condensing Heating Boiler $292.94

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