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
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
NAVIEN Boiler NFB-200H 199,000 BTU
✓ 199,000 BTU/h heating output
✓ 95% AFUE Condensing Efficiency
✓ 15-Year Heat Exchanger Warranty
NAVIEN Boiler NFB-175H 175,000 BTU
✓ 175,000 BTU/h heating output
✓ heavy-duty performance for large homes
✓ 15-Year Heat Exchanger Warranty
Navien NCB-H Combi Boiler Sizes & Applications
| Navien Model | Ideal Home Size | Heating Capacity | DHW Capacity | Best Usage |
|---|---|---|---|---|
| NCB-190/060H | Condos & small homes up to 1,500 sq ft | 60,000 BTU | 160,000 BTU | Ideal for compact homes with moderate heating and single-bathroom usage |
| NCB-190/080H | Homes up to 2,000 sq ft | 80,000 BTU | 160,000 BTU | Balanced heating and hot water for small families with 1–2 bathrooms |
| NCB-240/110H | Homes up to 2,800 sq ft | 110,000 BTU | 199,000 BTU | Great for homes with multiple bathrooms and moderate simultaneous usage |
| NCB-240/130H | Homes up to 3,500 sq ft | 130,000 BTU | 199,000 BTU | Ideal for larger homes with higher heating demand and multiple showers |
| NCB-250/150H | Large homes up to 4,500 sq ft | 150,000 BTU | 199,000 BTU | Best for large homes with high heating load and 3+ simultaneous hot water demands |
Why Install the Navien NCB-H Series with 4Most Energy?
Devices & Materials Included in Boiler Installation
Complete installation package with all required components.
Optional Add-On Devices & System Upgrades
Enhance your boiler’s efficiency, comfort, and reliability with professional upgrades by 4Most Energy.
Product Features
- Dual stainless steel heat exchangers for extended service life
- High-efficiency condensing operation (up to 95% AFUE)
- Combined space heating and domestic hot water system
- Advanced burner modulation for improved energy control
- Compact wall-mounted design for space-saving installation
- Built-in control system with diagnostic capabilities
- Low NOx emissions for reduced environmental impact
Navien Combi Boiler Technical Data
| Model | Heating Capacity | DHW Capacity | Efficiency | Fuel Type | Venting Type | Electrical | Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|
| NCB-190/060H | 60,000 BTU | 160,000 BTU | Up to 95% | Natural Gas | PVC / CPVC / Polypropylene | 120V | ~17 x 13 x 27 in | ~85 lbs |
| NCB-190/080H | 80,000 BTU | 160,000 BTU | Up to 95% | Natural Gas | PVC / CPVC / Polypropylene | 120V | ~17 x 13 x 27 in | ~85 lbs |
| NCB-240/110H | 110,000 BTU | 199,000 BTU | Up to 95% | Natural Gas | PVC / CPVC / Polypropylene | 120V | ~17 x 13 x 27 in | ~85 lbs |
| NCB-240/130H | 130,000 BTU | 199,000 BTU | Up to 95% | Natural Gas | PVC / CPVC / Polypropylene | 120V | ~17 x 13 x 27 in | ~85 lbs |
| NCB-250/150H | 150,000 BTU | 199,000 BTU | Up to 95% | Natural Gas | PVC / CPVC / Polypropylene | 120V | ~17 x 13 x 27 in | ~85 lbs |
Navien NCB-H Combi Boiler Sizing Guide
Recommended boiler capacity based on home size and typical household hot-water demand.
| Model | Heating Output | Recommended Home Size | Recommended Occupants |
|---|---|---|---|
| NCB-190/060H | 60,000 BTU | Up to 1,500 sq ft | 1–3 people |
| NCB-190/080H | 80,000 BTU | Up to 2,000 sq ft | 2–4 people |
| NCB-240/110H | 110,000 BTU | Up to 2,800 sq ft | 3–5 people |
| NCB-240/130H | 130,000 BTU | Up to 3,500 sq ft | 4–6 people |
| NCB-250/150H | 150,000 BTU | Up to 4,500 sq ft | 5–7 people |
Installation Process
Step 1: Request installation quote
Step 2: System sizing consultation
Step 3: Equipment recommendation
Step 4: Installation scheduling
Step 5: Removal of existing equipment
Step 6: Installation and system connection
Step 7: Safety testing and inspection
Step 8: Final commissioning
Payment Process
- Deposit upon booking
- Balance upon completion
Warranty & Maintenance
Navien provides manufacturer warranty coverage on key components including heat exchangers and internal parts. Warranty terms vary by component and model.
4Most Energy includes a labour warranty covering installation workmanship.
Warranty Claims Process
- Contact support
- System diagnosis performed
- Covered parts replaced as applicable
Maintenance Plan
Plans starting from $12.99/month include:
- Annual inspection
- Priority service
- Discounted repairs
- Improved system lifespan
Service Area
Greater Toronto Area (GTA) and surrounding regions
Toronto, Markham, Richmond Hill, Vaughan, Aurora, Newmarket, Scarborough, Brampton, and Mississauga.
Extended Service Area: Stouffville, Oshawa, Barrie, Orangeville, Hamilton, St. Catharines, Guelph, Kitchener.
What is a Navien Combi Boiler?
What is the difference between a “Heat-Only” and a “Combi” boiler?
A Heat-Only boiler (like the Rinnai I-Series Heating models) is a dedicated engine for warming your home via radiators or in-floor loops. It does not produce tap water directly. A Combi boiler does both jobs (heating + hot water) in one box. You should choose a Heat-Only model if you have a large home with high hot water demand and prefer using a separate Indirect Hot Water Tank for better volume.
How does Navien’s hot water priority system work?
Will a Navien Combi Boiler save me money?
What makes Navien’s heat exchanger design unique?
How does Navien’s burner and modulation system improve efficiency?
Can I use a Navien Combi Boiler with old cast-iron radiators?
How many showers can the Navien NCB-190/060H handle?
Can Navien Combi Boilers work with hydronic air handlers?
Is this system suitable for in-floor heating or multi-zone homes?
What is the best replacement option for my existing boiler?
What is included in the 4Most Energy installation quote?
Our quote is customized based on your current situation or specific new application needs to ensure system optimization. For customers in Toronto, Southern Ontario, and surrounding areas, our comprehensive proposal covers everything required to run the boiler reliably:
- Core Installation: Removal/disposal of the old unit and professional installation of the Rinnai boiler with S636 venting.
- Essential Hydronic Components: Installation of all critical devices needed to run the boiler, such as the Recirculation Pump, Expansion Tank, Feeder, and Isolation Valves.
- System Protection: Inclusion of Air Eliminators or Dirt Collectors to protect the new heat exchanger, plus a full system flush.
- Advanced Piping (As Needed): Setup of a Primary/Secondary Loop, and Zone/Pump Controllers depending on your specific application.
- Safety & Setup: Post-install gas/CO safety checks, followed by expert programming and balancing.
What does the installation process look like?
We follow a strict, safety-first protocol to ensure a smooth upgrade for your home. Here is our step-by-step process:
Site Preparation & Safety: We park safely to avoid blocking your neighbors. Inside, we cover floors and steps with protective runners and organize the boiler room to create a safe workspace for gas and plumbing work.
Removal & Disposal: We carefully drain and disconnect your old unit to prevent any water damage. We then remove it and transport it to a proper dump station—we never leave old equipment on your driveway or curb.
Mounting & Rough-In: We build a sturdy plywood platform on the wall to securely mount the new boiler and support all piping and devices. We use only high-quality fittings and piping.
Safety Precautions: If soldering is required, we temporarily cover smoke detectors to prevent false alarms and take full fire-safety precautions.
Gas & Wiring: We connect the gas lines and perform a preliminary pressure test to ensure no leaks. We then connect all thermostats, zone controllers, and pumps.
Venting (Critical Step): We install System 636 PVC venting with the correct slope to ensure condensation drains back to the unit. We use heavy-duty core bits to drill through your exterior wall, ensuring no damage to bricks or wooden structures.
Commissioning & Testing:
Leak Checks: We fill the system and check for water leaks.
Gas Calibration: We run the boiler for at least one hour, calibrating gas pressure and performing a carbon monoxide (CO) safety analysis.
Joint Inspection: We inspect all joints under heat stress to ensure they don't crack or leak.
Drainage: We verify the high-efficiency condensation drains properly to the floor drain or pump.
Tagging & Handover: Once the system passes all tests, our Gas Technician tags the pipe. We then walk you through the new system, showing you how to adjust temperatures and perform basic maintenance.
Post-Install Support: It is possible for minor adjustments to be needed after a fresh install. As a reputable contractor, we stand behind our work—if you see a leak or issue, we fix it fast (same day or next morning). Finally, we register your unit to officially start your warranty.
How long does installation take?
Most residential replacements are completed in one day (approx. 6–8 hours). Our team arrives in the morning with all necessary parts and aims to have your heat running by the evening.
How much does installation cost?
The final cost depends entirely on the boiler size, required hydronic items, and heating application. Upgrading from a low-efficiency or older unit is complex; it often requires upgrading plumbing using high-grade materials like copper, stainless steel piping, oxygen-barrier PEX, and premium fittings.
Starting Price: A professional installation by a Master Technician using high-quality materials starts at $2,000 (labor & material). This price increases as the boiler system becomes more complex (e.g., adding zoning or indirect tanks).
The "Cheap Quote" Warning: It is critical to avoid contractors offering suspiciously low prices. A boiler installed incorrectly often doesn't show symptoms right away but can suffer critical damage in less than 4 years. Furthermore, improper installation voids the manufacturer's warranty. Boiler installation requires a specialized Hydronic Expert, not just a general gas technician or plumber.
What is the warranty on a Navien Combi Boiler?
Does 4Most Energy warranty the installation?
Yes, absolutely. We stand behind our craftsmanship.
The 4Most Energy Installation Guarantee: Beyond the boiler unit itself, 4Most Energy covers installation-related issues for one year after installation. This includes:
- Drain line issues
- Support and mounting stability
- Wiring connections
- System calibration
- Plumbing connections
We ensure the system is set up perfectly so you don't have to worry about the "small stuff" causing big headaches.
What is included in annual maintenance?
Annual maintenance is strictly recommended to ensure you have smooth heating and hot water during cold weather. It is essential to improve performance, reduce the risk of gas or water leaks, and increase the lifespan of your unit.
Our expert service includes:
- Descaling/Flushing: Circulating a solution to remove internal mineral buildup.
- Filter Cleaning: Cleaning the air intake filter and the domestic cold water inlet filter.
- Ignition Check: Inspecting and cleaning the spark igniter and flame rod.
- Safety Check: Verifying there are no gas or exhaust leaks to ensure your family's safety.
- Combustion Analysis: Measuring CO and CO2 levels to ensure the unit is burning fuel safely and efficiently.
Why is flushing important in Ontario?
Some areas of Ontario have moderately hard water.
The Risk: Without regular flushing, calcium and magnesium minerals precipitate out of the water and stick to the inside of the heat exchanger (scale).
The Damage: This scale acts as an insulator, trapping heat in the metal. This causes "thermal stress," leading to premature cracks and leaks in the heat exchanger—damage that is not covered by warranty.
What can void my Navien warranty?
Why choose 4Most Energy for Navien installation?
What happens if my boiler stops working in winter?
Do you provide repair services?
Yes. We are comprehensive hydronic specialists. We service, repair, and maintain all major makes and models, including:
- Viessmann
- Flowmax
- Baxi
- Rinnai
- NTI
- And many others.
Do you offer financing?
Yes. We offer flexible payment plans, including 3 Months No Payments/No Interest or low monthly payments for up to 24 months, helping you upgrade to high-efficiency comfort without the upfront stress.
Can I buy the unit without installation?
Yes. We offer a "Supply Only" service. We provide the full kit (Boiler + Venting + Valve Kits) and offer free sizing consultation to ensure you buy the right model. We also provide technical support if you get stuck during your install.
How can I get a quote or troubleshooting help?
Live Chat via WhatsApp. We offer free consultation and troubleshooting directly through WhatsApp. You can send us photos of your current setup, and a Master Technician (not a sales rep) will provide a rough estimate or technical advice instantly.
Navien Boiler Gallery
