NAVIEN Boiler NFB-175H 175,000 BTU

Name: Discover the Navien NHB-175H for Large Homes & More
SKU: NFB175H
Price: 3706.00 CAD
Availability: InStock

SKU: NFB175H

$3,706.00

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Boiler Adds On

Boiler Isolation Valves Kit (+$650.00)

Expansion Tank Kit (+$480.00)

Boiler Auto Feeder (+$320.00)

Hydronic Pipes and Materials (+$890.00)

System Circulator Pump (+$450.00)

Warranty

Manufacture's Warranty:

• Heat Exchanger: 15 Years • Parts: 5 Years • Labor: 1 Year

5-Year Extended Boiler Labour Warranty (+$299.00)

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  141 reviews

✓ 175,000 BTU/h heating output
✓ heavy-duty performance for large homes
✓ 15-Year Heat Exchanger Warranty

Heat Only Boilers

NAVIEN Boiler NFB-175H 175,000 BTU

$3,706.00

✓ 175,000 BTU/h heating output
✓ heavy-duty performance for large homes
✓ 15-Year Heat Exchanger Warranty

Request a quote

Add to cart

NAVIEN Boiler NFB-200H 199,000 BTU

$3,978.00

✓ 199,000 BTU/h heating output
✓ 95% AFUE Condensing Efficiency
✓ 15-Year Heat Exchanger Warranty

Request a quote

Add to cart

Combi Boilers

Navien Combi Boiler NFC-250/200H installed by 4Most Energy

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NAVIEN Combi Boiler NFC-250/200H , 199,000 BTU Heating, 210,000 BTU Water Heating

✓ 199K BTU/h H | 210K BTU/h DHW
✓ 95% AFUE High-Efficiency Condensing
✓ 15-Year Heat Exchanger Warranty

Request a quote

Add to cart

Sale

NAVIEN Combi Boiler NFC-250/175H , 175,000 BTU Heating, 250,000 BTU Water Heating

✓ 175K BTU/h H | 210K BTU/h DHW
✓ 10.8 GPM max flow rate
✓ 15-Year Heat Exchanger Warranty

Request a quote

Add to cart

Navien NFB-175H Heat-Only Boiler

Installed by 4Most Energy, 175,000 BTU Heating • Heavy-Duty High-Efficiency Boiler

The Navien NFB-175H is a commercial-grade, heavy-duty condensing boiler built for large homes, buildings, and specialty heating applications. Installed and commissioned by 4Most Energy, this boiler provides powerful and reliable hydronic heating with the flexibility to handle complex, high-demand systems — from snow-melting and garage heaters to large radiant and multi-zone applications.

With a 175,000 BTU/h heating output, stainless-steel fire-tube heat exchanger, and 95 % AFUE efficiency, the NFB-175H delivers exceptional performance, durability, and energy savings even in the harshest Ontario climates.

Why Choose the NFB-175H (Installed by 4Most Energy)

Heavy-duty performance (175,000 BTU/h) for large or high-load systems
Stainless-steel fire-tube heat exchanger for superior heat transfer and corrosion resistance
Handles glycol systems — ideal for garage heaters, snow-melt, or cold-climate radiant loops
Smart control system with cascade capability for multi-boiler setups
Hydraulic separator recommended for large and multi-zone applications
Compatible with multiple indirect tanks for domestic hot-water integration
Up to 95 % AFUE efficiency for lower energy costs and emissions

Best Fit (Size & Applications)

Perfect for large residential buildings, multi-unit properties, or light-commercial spaces up to ~5,000 sq ft
Supports radiant in-floor, snow-melt, garage heaters, and hydronic air-handler systems
Can manage multiple indirect water tanks to supply domestic hot water
Designed for high-capacity systems with hydraulic separation and zoning control

       
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 4.9
 Top Rated Service
   Verified by Trustindex   Top Rated Service
   4.9 Excellent rating Last 12 months 
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  Responds to customer reviews 74% response rate within 48 hours 
  Verified by Trustindex Based on real customer reviews Learn more 
 
 
 
 
 
 
 
   
 
 
      Posted on Google  
   
   Mahvash Madani 
 2 days ago
 
 
 Trustindex verifies that the original source of the review is Google. I had a great experience with 4Most Energy. They provided all the i formation I needed and clearly explained the different options available which made it easy to make an informed decision. Their pricing was reasonable and competitive, and I really appreciate their responsiveness and flexibility in accommodating my needs. The installation team was professional, efficient, and did a great job.Overall, the entire process was smooth and stress-free. I am very happy with the service and would highly recommend them for anyone looking for reliable HVAC services.
  
 
     Posted on Google  
   
   H Lau 
 11 days ago
 
 
 Trustindex verifies that the original source of the review is Google. 
  
 
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   Harini 
 17 days ago
 
 
 Trustindex verifies that the original source of the review is Google. +0
We had a great experience with Rey and his team during our new Rinnai boiler installation. The technicians did an amazing job and worked efficiently. The technician Sam was knowledgeable, professional, and respectful throughout the installation. He took the time to answer all my questions and made sure everything was properly checked before finishing the job.

They arrived on time and completed the boiler installation on schedule.

We are very happy with the service and would definitely recommend them to anyone looking for reliable and professional HVAC service.

Thanks.
  
 
     Posted on Google  
   
   Vip C. 
 17 days ago
 
 
 Trustindex verifies that the original source of the review is Google. +0
Excellent service and very reasonable pricing for a new AC installation. The team arrived right on time, provided a smooth and professional installation, and there were absolutely no hidden costs. Communication was transparent, proactive, and consistent throughout the entire process. Highly recommend them to anyone looking for reliable and honest HVAC service.
  
 
     Posted on Google  
   
   kevin liu 
 20 days ago
 
 
 Trustindex verifies that the original source of the review is Google. 
  
 
     Posted on Google  
   
   Brian Johnston 
 22 days ago
 
 
 Trustindex verifies that the original source of the review is Google. +1
I was very pleased with the competitive pricing I got specifically from 4most energy. I contacted many companies to get their best quote. Sometimes there are even daughter or sister companies that will give you better quotes than the parent companies. It's best to check around for the identical product with installation from many companies. I was also pleased with the installers. They did have to cut away some insulation to install the Rinnai RX199 on the outside wall the house. Not sure if they should have tried replacing that insulation afterwards, but won't complain about the job they did because I think I got the best price on the market after getting quotes from about a dozen companies.
  
 
     Posted on Google  
   
   Joseph Spitale 
 37 days ago
 
 
 Trustindex verifies that the original source of the review is Google. +0
We recently had a Navien Combi boiler installed by 4Most Energy and had a great experience from start to finish. Rey was our sales representative and Sam was our technician, and both were excellent to work with.

They arrived on time, the installation was fast and efficient, and everyone was friendly and professional throughout the process. Sam did a great job with the installation, and everything is working perfectly.

We’re also very happy with the Navien Combi boiler itself. Overall, we couldn’t be happier with the service, the installation, and the product. We would definitely recommend 4Most Energy.
  
 
     Posted on Google  
   
   Da big_Guy 
 38 days ago
 
 
 Trustindex verifies that the original source of the review is Google. +0
Rey, Ben and Amad thank you very much for the amazing work on my hot water tank purchase and installation. You a have a loyal customer fir life. I will make sure my family and friends use your service.
Zoran.
  
 
     Posted on Google  
   
   Marvin Harrison 
 40 days ago
 
 
 Trustindex verifies that the original source of the review is Google. +2
I contacted 4Most Energy to replace my 14 year old AC unit. Their intake process was smooth. They provided a reasonable quote the same day. The installation of the new AC unit was scheduled and the service provided by Farzad and his associate was completed within a reasonable time. They did a great job on the installation, hauled away the old equipment, and left the job site (both indoors and outdoors) in good condition. I would not hesitate to recommend 4Most Energy for your heating and cooling needs.
  
 
     Posted on Google  
   
   Rodney BROWN 
 40 days ago
 
 
 Trustindex verifies that the original source of the review is Google. +0
Scheduling was quick and easy. The team showed up on time, were quick and efficient and did an overall good job!
  
 
     Posted on Google  
   
   Jag Jasani 
 41 days ago
 
 
 Trustindex verifies that the original source of the review is Google. +0
Great job Rey, Sam and team! My tankless water heater was broken for two months and after getting the run around from Enercare and Reliance, I decided on purchasing a Navien from 4Most Energy and they did a great job explaining the process and installing it the next day. Thank you for the top notch service!
  
 
     Posted on Google  
   
   Maryam Badakhshi 
 48 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Hamid installed a new heater for us. We had a great experience. He and the team were professional and the work was done in a day. We really appreciate their promptness. We’d definitely recommend Hamid.
  
 
     Posted on Google  
   
   Chris Luc 
 51 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Great job by Hamid. Thanks
  
 
     Posted on Google  
   
   Adrian Cann 
 53 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Great service, great price, great technicians, big job but the work was executed with perfection!!!
  
 
     Posted on Google  
   
   Charles Hawkes 
 57 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Arrived promptly, installed new water heater in a professional manner, checked the installation for any gas or water leaks, cleaned up the work site. Very satisfied with the service and pricing. Strongly recommend 4MostEnergy.

Navien Boiler FAQs

Answered by 4Most Energy Experts

Which Navien boiler is right for my home or building?

The right model depends on your heating load, system type, and building size.

NHB Series: Compact, high-efficiency heat-only boilers for homes up to 4,000 sq ft.
NFB-H Series: Heavy-duty models (175K–199K BTU) for large or light-commercial buildings.
NCB & NFC Combi Series: Dual-purpose boilers for both space heating and domestic hot water.
Our team provides a free consultation to help you select the best system.

Can Navien boilers work with radiant or in-floor heating systems?

Yes, all Navien boilers installed by 4Most Energy are compatible with radiant, baseboard, and air-handler systems. Models like the NHB and NFB are ideal for radiant heating loops, snow-melt zones, or multi-zone hydronic systems.

Can I connect an indirect tank to my Navien boiler?

Yes. All heat-only Navien models (NHB & NFB) can connect to an indirect water tank for reliable domestic hot water. This setup replaces a traditional gas water heater and offers faster recovery, lower fuel use, and longer system life. Tank sizes typically range from 40 to 70 gallons, depending on your household demand.

Can I use glycol in my Navien boiler system?

Yes — models like the NFB-175H and NFB-200H are fully glycol-compatible. Glycol is essential for garage heating, snow-melt, and outdoor radiant systems, preventing freeze damage in low temperatures. Always ensure the mixture and type of glycol meet Navien’s specifications; 4Most Energy can prepare and balance this during installation.

How do I know which accessories or devices I need for my system?

Every installation is unique. Accessories such as hydraulic separators, buffer tanks, low-loss headers, expansion tanks, or zone controls may be required depending on your home’s heating layout and zoning. During the site visit, 4Most Energy’s certified technicians evaluate your system and provide a detailed accessory plan to ensure proper flow and efficiency.

How do I make sure I’m getting the right size boiler?

Proper boiler sizing is critical. Oversized units waste energy, while undersized ones may not meet demand. 4Most Energy performs a professional heat-loss calculation during consultation, factoring in your building size, insulation, window area, and heating zones to recommend the correct Navien model.

Can Navien boilers be cascaded for larger commercial systems?

Yes — models like the NFB-175H and NFB-200H support cascade integration, allowing multiple boilers to operate together for higher capacity and redundancy. This setup is ideal for apartment buildings, hotels, spas, and commercial facilities. 4Most Energy designs and installs full multi-boiler cascade systems for scalable heating performance.

How is part availability for Navien boilers in Ontario?

Navien has strong parts availability across Canada, and 4Most Energy maintains direct supply relationships with Navien distributors. Most replacement parts — including sensors, valves, fans, and boards — are available within 24–48 hours, ensuring minimal downtime if service is ever needed.

What happens after the 1-Year Labour Warranty expires?

After the first year, 4Most Energy continues to offer on-demand service and annual maintenance at a preferred customer rate. You can also subscribe to our Service Protection Plan, which includes priority scheduling, annual inspection, cleaning, and discounted repair rates. Our dedicated technicians are always available to support you long after installation.

Why should I install my Navien boiler with 4Most Energy?

4Most Energy is a certified Navien installer with licensed HVAC technicians across Ontario. We provide expert system design, professional installation with stainless and black-iron piping, and full warranty coverage, including a 1-Year Labour Warranty and priority after-service support for your peace of mind.

Made Simple with 4Most Energy

Navien Boiler Installation

A simple 3-step process to get your Navien Boiler professionally installed anywhere in Ontario.

01.

Consultation & Quote

Contact us online or by phone for a free estimate. Our Navien-certified experts help you choose
the right boiler model for your home or building — based on your heating load, system type, and space.

Site Visit & Preparation

A licensed technician visits your property to inspect the space, confirm venting and gas line setup, and design a system tailored to your building. You’ll receive a transparent quote with all installation details.

Professional Installation & Startup

Our installation team handles piping, venting, and system calibration. Each Navien boiler is tested for optimal performance and comes with a 1-Year Labour Warranty and priority support in Ontario.