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The Navien NFB-175H, installed by 4Most Energy, delivers 175,000 BTU/h of heavy-duty heating for large homes, buildings, and commercial spaces. Handels glycol systems, snow melting, and radiant heating support multiple indirect tanks and hydraulic separation for powerful, efficient performance.
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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.
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
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
| Model | NFB-175H | Brand | Navien | Series | NFB-H |
|---|---|---|---|---|---|
| Type | Heat-Only Heavy-Duty Condensing Boiler | Heating Capacity | 175,000 BTU/h | AFUE Efficiency | 95 % |
| Fuel Type | Natural Gas / Propane | Heat Exchanger | Stainless-Steel Fire Tube | Wi-Fi Capable | YES (NaviLink™ Ready) |
| Venting Type | Direct Vent (PVC, CPVC, Polypropylene) | Built-In Circulator | NO | Energy Star | YES |
| Product Depth | 15.9" | Product Width | 17.3" | Product Height | 27.6" |
| Weight | 110 lbs | Glycol System Compatible | YES – Ideal for Snow Melt & Garage Heat | Indirect Tank Compatibility | Multiple Tanks Supported |
| Recommended Accessories | Hydraulic Separator for Multi-Zone or Large System Applications | ||||
| Warranty – Heat Exchanger | 10 Years | Warranty – Parts | 5 Years | Labour Warranty (4Most Energy) | 1 Year |
4Most Energy proudly serves homeowners and businesses throughout the Greater Toronto Area, Golden Horseshoe, and Southwestern Ontario with professional installation and service for Navien tankless water heaters and boilers.
We offer expert sales, installation, and maintenance for all Navien high-efficiency systems in:
Toronto • North York • Richmond Hill • Vaughan • Markham • Aurora • Newmarket • Mississauga • Oakville • Burlington • Brampton • Hamilton • St. Catharines • Niagara Falls • Kitchener • Waterloo • Guelph • Cambridge • Milton • Orangeville • Barrie • Oshawa • Whitby • Ajax • Pickering • Stoney Creek • Grimsby, and all surrounding communities.
Our certified HVAC team provides on-site installation and replacement services across these regions. Every Navien installation by 4Most Energy includes a 1-year labour warranty, ensuring peace of mind and guaranteed workmanship.
With licensed technicians strategically located throughout Ontario, we offer fast response times for after-installation service, emergency repairs, and priority maintenance calls, keeping your Navien tankless water heater or boiler running efficiently year-round.
The Navien NFB-175H is a heavy-duty, high-capacity boiler engineered
for large residential, commercial, and mixed-use buildings up to ~5,000 sq ft.
With 175,000 BTU/h of heating power, it’s ideal for demanding systems with multiple
zones, radiant loops, and high-heat applications.
Heating Output: 175,000 BTU/h |
Efficiency: 95 % AFUE |
Type: Heat-Only Heavy-Duty Condensing Boiler |
System Design: Supports Glycol Systems & Hydraulic Separation
Built for large radiant systems, snow-melt zones, garage heaters, and multi-zone hydronic networks.
The NFB-175H can also operate with multiple indirect tanks for domestic hot-water supply.
Use of a hydraulic separator is recommended for consistent pressure balance in high-flow systems.
⚙️ Professionally sized and installed by 4Most Energy — with expertise in heavy-duty
hydronic design, glycol system setup, and multi-zone optimization across Ontario.
Answered by 4Most Energy Experts
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
A simple 3-step process to get your Navien Boiler professionally installed anywhere in Ontario.
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.
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.
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.
Off-season pricing means the best deals of the year on high-efficiency air conditioners.
Save Big on Lennox Furnaces — Limited Time!
Get a new high-efficiency Lennox furnace with no payments for up to 6 months. Premium comfort, top-tier performance.
Simple estimates, flexible payments, pro installation, and industry-leading warranties.
