Navien NFB Fire-Tube Condensing Boiler – Residential & Commercial
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The Navien NFB is a heat-only condensing boiler with a stainless steel fire-tube heat exchanger, built for larger homes (NFB-H, 95% AFUE) and commercial buildings (NFB-C, 97.5% thermal efficiency). Turndown up to 15:1 keeps it efficient at low loads, and every price includes standard installation by our TSSA-certified gas technicians, who specialize in hydronic heating across Toronto and the GTA.
- ✓ Standard installation included in every price
- ✓ 95% AFUE residential, 97.5% thermal efficiency commercial
- ✓ Heat-loss sizing, so your boiler matches your home, not your old unit
- ✓ 1-year labour warranty, plus the manufacturer's warranty
- ✓ Financing available, with no upfront payment options
⭐ Where the NFB Fits
We install three boiler brands. Each one is a good boiler; they differ in price and features:
Navien
Lowest installed price. This page: NFB fire-tube. Also see the NHB and NCB-H combi.
NTI
Canadian-made and well known. The choice most of our customers make. See the TRX Series II.
Compare installed prices for every brand in our Boiler Replacement Cost Toronto guide.
📏 Choose Your NFB Size
| Model | Best for | Heating output (net AHRI) | Efficiency |
|---|---|---|---|
| NFB-175H | Large homes | 139,000 BTU/h | 95% AFUE |
| NFB-200H | Very large homes | 158,000 BTU/h | 95% AFUE |
| NFB-301C | Multiplexes, small commercial | 255,000 BTU/h | 97.5% thermal |
| NFB-399C | Commercial buildings | 338,000 BTU/h | 97.5% thermal |
Home size is a guide only. We confirm the right model with a heat-loss calculation before installation.
💡 Residential or commercial? The NFB-175H and 200H suit large homes with radiators or radiant floors. The NFB-301C and 399C are commercial boilers for multi-unit and small commercial buildings, and can be cascaded for bigger loads. See Commercial Boiler Installation.
🔥 Key Features
- ✓ Stainless steel fire-tube heat exchanger
- ✓ Turndown up to 15:1 for steady temperatures and less cycling
- ✓ 95% AFUE (NFB-H) and 97.5% thermal efficiency (NFB-C)
- ✓ Ready-Link cascade and common venting up to 8 units with the optional damper kit
- ✓ Venting: NFB-H 2" up to 65 ft or 3" up to 150 ft; NFB-C 3" or 4"
- ✓ ¾" NPT gas inlet on every model
- ✓ Works with radiators, baseboard, radiant floors, snow melt and hydronic air handlers
📸 Our Navien Boiler Installations
🔧 What Standard Installation Includes
- ✓ Delivery of your new boiler
- ✓ Removal of your old boiler
- ✓ Wall mounting and connection to your existing heating system
- ✓ Gas, venting and condensate drain connections
- ✓ Startup, commissioning and controls setup
- ✓ 1-year labour warranty and warranty registration
A high-efficiency to high-efficiency replacement typically needs no extras. Added accessories (pumps, feeder valve, backflow preventer, air or dirt separator), new venting over 20 ft, extra plumbing or difficult access are quoted separately. See what can add to the cost.
This boiler is sold with installation only. Please contact us before checkout so we can confirm the right size and any extras for your project.
📋 Technical Specifications
| Model | NFB-175H | NFB-200H | NFB-301C | NFB-399C |
|---|---|---|---|---|
| Heating input (BTU/h) | 13,300–175,000 | 13,300–199,900 | 20,000–301,000 | 26,000–399,000 |
| Heating capacity (BTU/h) | 160,000 | 182,000 | 293,000 | 389,000 |
| Net AHRI rating (BTU/h) | 139,000 | 158,000 | 255,000 | 338,000 |
| Efficiency | 95% AFUE | 95% AFUE | 97.5% thermal | 97.5% thermal |
| Weight, empty (lb) | 121 | 121 | 243 | 278 |
| Water content (gal) | 4.5 | 4.5 | 7.6 | 9.6 |
Heating connections 1¼" NPT (NFB-H and NFB-301C); ¾" NPT gas inlet on all models. Source: Navien NFB-H technical data sheet and navieninc.com NFB-301C / NFB-399C product pages.
Documents: Navien NFB-H Brochure (PDF) · Navien NFB-C Brochure (PDF)
🛡️ Warranty
- ✓ Heat exchanger: manufacturer's warranty
- ✓ Parts: 5 years
- ✓ Labour: 1 year from Bison Air
🏆 Why Buy Your NFB from Bison Air
- ✓ TSSA Certified HVAC Contractor
- ✓ Fully Licensed & Insured HVAC Technicians
- ✓ Navien is our best-value boiler line, installed with the same care as every brand
- ✓ Hydronic specialists: boilers, radiant, snow melt and air handlers
- ✓ Clean, organized copper and PEX installations
- ✓ 1-year labour warranty on every installation
🔗 Related
- ✓ Boiler Installation Toronto
- ✓ Commercial Boiler Installation
- ✓ Boiler Replacement Cost
- ✓ All Boilers & Combi Boilers
- ✓ Navien NHB Heating Boiler
- ✓ Navien NFC-H Combi Boiler
- ✓ Heated Driveway & Snow Melt
- ✓ HVAC Financing
📍 Areas We Serve
Navien NFB boiler installation throughout Toronto and the GTA:
Toronto · North York · Scarborough · Etobicoke · Vaughan · Markham · Richmond Hill · Aurora · Newmarket · East Gwillimbury · King City · Stouffville · Mississauga · Brampton · Oakville · Milton · Burlington · Barrie · Innisfil · Orillia · Bradford · Keswick · Ajax · Pickering · Whitby · Oshawa · Orangeville
🔥 Get Your Navien NFB Quote
Tell us about your home or building and current boiler. We will confirm the right NFB size and give you a clear written price.
or fill out our form for a free consultation · Serving Toronto & the GTA
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