Price range: $6,690.00 through $7,590.00
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The Navien Combi Boiler NCB-H Series is a high-efficiency condensing unit that delivers both space heating and domestic hot water in one compact system. Featuring dual stainless steel heat exchangers and advanced modulation, it ensures reliable comfort while maximizing energy savings—ideal for modern homes seeking efficiency and space-saving design.
| 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 |
Complete installation package with all required components.
Enhance your boiler’s efficiency, comfort, and reliability with professional upgrades by 4Most Energy.
| 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 |
| 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 |
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
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.
Plans starting from $12.99/month include:
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.
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:
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.
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.
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.
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:
We ensure the system is set up perfectly so you don't have to worry about the "small stuff" causing big headaches.
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:
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.
Yes. We are comprehensive hydronic specialists. We service, repair, and maintain all major makes and models, including:
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.
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.
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.
