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 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 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
Rinnai I-Series Plus Combi Boiler Sizes & Applications
| Rinnai Model | Ideal Home Size | Heating Applications | Hot Water Flow Rate | Best Usage |
|---|---|---|---|---|
| IP060160C | Condos, townhomes & small homes up to 1,400 sq ft | Hydronic air handlers, small radiant floor zones, compact radiator systems | Max 7.9 GPM 4.1 GPM @ 70°F rise | Perfect for energy-efficient condos replacing older Baxi or Flow Max combi systems |
| IP090160C | Homes up to 1,800 sq ft | Air handlers, high-velocity & low-velocity heating systems, small in-floor heating zones | Max 7.9 GPM 4.1 GPM @ 70°F rise | Balanced heating capacity with reliable hot water for daily household demand |
| IP090199C | Homes up to 2,500 sq ft | Air handlers, hydronic basement floor heating, cast iron or baseboard radiator systems | Max 9.8 GPM 5.1 GPM @ 70°F rise | Excellent for homes running multiple showers or appliances simultaneously |
| IP120199C | Homes up to 2,500 sq ft | Multi-zone heating systems, radiant floor heating, air handlers and radiator applications | Max 9.8 GPM 5.1 GPM @ 70°F rise | Higher heating output while maintaining strong domestic hot water performance |
| IP150199C | Large homes up to 3,500 sq ft | Large air handlers, hybrid heating systems, extensive radiant floor heating and multi-zone radiator systems | Max 9.8 GPM 5.1 GPM @ 70°F rise | Ideal for luxury bathrooms, soaking tubs, and homes requiring 3+ simultaneous showers |
Why Install the Rinnai Combi Boiler with 4Most Energy?
15+ Years of Expertise
We have specialized in Boiler and Tankless systems for over 15 years. We aren't generalists; we are experts.
Premium Installation Materials
We don't cut corners. We use premium piping, valves, and fittings to ensure your system is leak-free and built to last.
Proudly Local
We are based in and proudly serve the Greater Toronto Area and Southern Ontario.
Guaranteed Satisfaction
Backed by a 100% customer satisfaction warranty and a 30-day return policy
Transparent Pricing
No hidden fees or surprise upcharges. We provide clear, upfront quotes so you know exactly what you are paying for.
Fully Certified & Insured
TSSA-certified and fully insured technicians for your peace of mind
Rinnai Parts & Repair Availability:
We provide comprehensive after-sales support, including full access to genuine Rinnai parts and expert repair services, so you are never left without heat or hot water.
Stress-Free Boiler Installation
From your first call to final start-up, 4Most Energy certified boiler experts handle everything
Professional Boiler Installation
We install the new high-efficiency boiler on a secure plywood mounting board and connect it to the gas, venting, and hydronic system. Dual PVC vent pipes (intake and exhaust) are routed through the side wall for proper airflow. The installation also includes setting up a drain system for condensate management and installing all the necessary devices and piping to ensure safe operation. After installation, we perform a full leak test and air bleeding process to remove trapped air and verify system pressure. All connections meet Ontario safety standards, and the system is purged, pressure-tested, and fully optimized for performance.
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
Condensing combi boiler providing space heating and domestic hot water
Lower minimum heating temperature of 86°F (30°C) for low-temperature systems
Optimized simultaneous central heating and DHW operation capacity
Advanced outdoor reset control curves for efficient temperature management
Built-in combustion test port for simplified service and diagnostics
Diagnostic monitoring including continuous DHW diagnostic code alerts
Updated control board for improved ECM pump compatibility
CRN registered design compliant with Canadian pressure vessel standards
Technical Data
| Specification | Details |
|---|---|
| Product Type | Condensing Combi Boiler |
| Models | IP060160C, IP090160C, IP090199C, IP120199C, IP150199C |
| Fuel Type | Natural Gas |
| Application | Hydronic Heating + Domestic Hot Water |
| Venting | Polypropylene venting compatible including 2" flexible venting (vertical applications) |
| Minimum Heating Temperature | 86°F (30°C) |
| Control Features | Outdoor reset curves and adjustable setpoints |
| Diagnostics | Built-in diagnostic codes including DHW monitoring |
| Certification | CRN registered pressure vessel design |
Rinnai I-Series Combi Boiler Sizing Guide
Recommended boiler capacity based on home size and typical household hot-water demand.
| Model | Heating Capacity | Recommended Home Size | Recommended Occupants |
|---|---|---|---|
| IP060160C | 60,000 BTU | Up to 1500 sq ft | 1–2 occupants |
| IP090160C | 90,000 BTU | Up to 2200 sq ft | 2–3 occupants |
| IP090199C | 90,000 BTU | Up to 2400 sq ft | 3–4 occupants |
| IP120199C | 120,000 BTU | Up to 3000 sq ft | 3–5 occupants |
| IP150199C | 150,000 BTU | 3000+ sq ft | 4–6 occupants |
Note: Proper boiler sizing should always be confirmed through a professional heat-load calculation. Sizing estimates may vary depending on insulation levels, climate conditions, and hot-water demand.
Installation Process
Installing a high-efficiency combi boiler requires detailed planning and professional commissioning.
Step-by-Step Installation Journey
Request an installation quote
Heating load and system sizing consultation
Equipment recommendation and model selection
Installation scheduling
Removal of existing heating equipment (if required)
Boiler mounting, piping, gas and vent connection
Safety inspection and combustion testing
Final system commissioning and homeowner orientation
Payment Process
A deposit is required to schedule installation, with the remaining balance due upon system commissioning.
Warranty & Maintenance
Rinnai boilers include manufacturer warranty coverage for key components including the heat exchanger and internal parts. Warranty terms vary depending on installation and maintenance conditions.
4Most Energy Labour Warranty
All installations performed by 4Most Energy include a labour warranty covering workmanship and installation quality.
Warranty Claim Process
If a system issue occurs:
Contact 4Most Energy support
Technician diagnosis is scheduled
Warranty parts replacement handled directly with manufacturer
System restored to full operation
Optional Maintenance Plans
Preventive maintenance plans starting from $12.99/month are available.
Benefits include:
Annual boiler inspection
Priority service scheduling
Reduced repair costs
System efficiency optimization
Extended equipment lifespan
Advanced Comfort Expert · Rinnai ACE PRO
Rinnai Factory Authorized Service
As a premier member of the official Rinnai PRO Network, our team is factory-trained and ACE-certified to provide the highest level of expertise available in the industry.
Whether you're looking for a new tankless installation or elite maintenance for your current home heating solutions, we ensure your system operates at peak reliability.
Why Hire an Rinnai ACE PRO?
Hiring a certified Advanced Comfort Expert means you are choosing a technician vetted for their skill, knowledge, and commitment to the Rinnai standard.
Extended Service Plans
We utilize advanced tools like the Rinnai Central™ App for system setup, precision tuning, and remote system monitoring.
Expert Diagnostics
We utilize advanced tools like the Rinnai Central™ App to ensure accurate system setup, precision tuning, and remote system monitoring.
ACE PRO Expertise
As Advanced Comfort Experts, we ensure your system is perfectly sized for consistent hot water and maximum energy savings.
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.
Rinnai Combi Boilers FAQs
What is a Rinnai Combi Boiler?
A Rinnai Combi (Combination) Boiler is a single, compact unit that handles two major jobs for your home:
Central Heating: It heats the water that circulates through your Air handler, Furnace, radiators or radiant floor heating system.
Domestic Hot Water (DHW): It acts as a tankless water heater, providing continuous hot water for showers, taps, and appliances.
Unlike traditional systems that require a massive boiler plus a separate hot water storage tank, the Rinnai I-Series (and M-Series) does it all in a wall-mounted unit roughly the size of a suitcase.
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 the Rinnai I-Series "Simultaneous Delivery" work?
One of the biggest advantages of the Rinnai I-Series Plus is its ability to deliver simultaneous home heating and hot water.
The Problem with Older Combis: Traditional combi boilers often prioritize hot water. If someone takes a shower, the house heating pauses.
The Rinnai Solution: The I-Series uses advanced logic to maintain your home's temperature while ensuring your shower stays hot. It essentially multitasks, ensuring comfort isn't compromised during high-demand times like morning routines.
Will a Rinnai Combi Boiler save me money?
Yes, in two significant ways:
Energy Efficiency: Rinnai Combi Boilers are condensing units with up to 96% AFUE (Annual Fuel Utilization Efficiency). This means for every dollar you spend on natural gas, 96 cents goes directly into heating your home and water. Older boilers often operate at 60-80% efficiency.
Space Savings: By eliminating the hot water tank, you free up roughly 12-16 square feet of floor space—valuable real estate in Toronto condos and townhomes.
What makes the Rinnai Heat Exchanger design unique?
The Rinnai I-Series features a Self-Cleaning Stainless Steel Heat Exchanger.
Design: Unlike competitors that use aluminum (which can corrode) or standard stainless steel, Rinnai uses a unique down-fired ceramic burner design.
Self-Cleaning Action: By firing downwards, condensation naturally drains out of the unit, flushing away sediment and preventing mineral buildup on the heat exchanger walls. This design significantly extends the lifespan of the unit compared to traditional up-fired boilers.
How does the "Down-Fired" Burner improve efficiency?
The down-fired ceramic burner is a key design element of the Rinnai I-Series.
Vertical Integration: The burner is located at the top of the heat exchanger, firing flame downwards. This maximizes heat transfer as the hot gases travel through the stainless steel tubes.
Modulation: The burner design allows for an incredibly high Turndown Ratio (up to 10:1). This means the boiler can run at just 10% of its power on mild Spring days, avoiding the "short-cycling" (turning on and off rapidly) that wears out other boilers.
Can I use a Rinnai Combi Boiler with old cast-iron radiators?
Yes, absolutely. However, retrofitting a modern high-efficiency boiler to a vintage cast-iron system requires expert design to ensure longevity.
System Design (Primary/Secondary Loop): A boiler expert must design the piping using a primary/secondary loop. This is critical to ensure the correct flow rate through the boiler while maintaining the high-volume circulation required to heat heavy cast-iron radiators evenly.
Boiler Protection (Dirt Collector): Old radiators often contain decades of sludge and sediment. A Dirt Collector (Magnetic Filter) is mandatory to trap this debris before it enters the new boiler, preventing damage to the sensitive heat exchanger.
Air Elimination: It is vital to install an Air Eliminator to scrub oxygen from the water. Oxygen is the primary cause of corrosion in cast-iron systems.
Sizing: As always, the unit must be accurately sized for both the home's heat loss and your domestic hot water demand.
Feel free to get free professional advice from our boiler experts at 4Most Energy, serving the Greater Toronto Area and Southern Ontario.
Up to how many showers can a Rinnai Combi Boiler provide hot water?
The Rinnai I-Series offers a maximum flow rate of 9.8 Gallons Per Minute (GPM), providing superior performance compared to other brands. However, capacity depends on seasonal water temperatures:
Performance depends heavily on the model's BTU capacity and seasonal water temperatures:
160,000 BTU Models: These units are specifically designed for small condos and townhouses. They provide less hot water capacity and are recommended for homes with a maximum of 1 shower running at a time.
199,000 BTU Models: These larger units offer a maximum flow rate of 9.8 Gallons Per Minute (GPM). Even in winter, as the inlet water temperature drops, they adjust to approximately 5.1 GPM, which can easily handle two showers simultaneously.
Capacity: Even at this winter rate, the Rinnai can easily handle two showers simultaneously without losing pressure or heat.
Large Home Recommendation: For larger homes with more than two showers, we recommend installing a buffer tank. This addition handles higher demand and provides faster hot water delivery, ensuring peak performance even during the coldest Canadian winter days.
Important: Always ask 4Most Energy boiler experts to calculate the specific temperature rise and domestic hot water flow rate for your home before buying a combi boiler. Incorrect sizing can lead to significant hassles and inadequate hot water.
Can Rinnai combi boiler work with my Hydronic Air Handler?
Yes, absolutely. For Ontario condos, townhouses, and homes where space savings, high capacity, and efficiency are critical, this combination offers the perfect all-in-one solution.
Rinnai Combi Boilers are designed to provide the perfect water temperature to maximize the efficiency of hydronic heating applications. They pair perfectly with:
High-Velocity Systems: Brands like MAX AIR, iFLOW, Spacepak, The Unico System, and Enerzone.
Low-Velocity Systems: Traditional systems from brands like Carrier, Trane, and Lennox.
One-Stop Shop: 4Most Energy is an expert in these integrated heating solutions. We not only specialize in Rinnai Combi Boilers but also supply and install high-performance air handlers, ensuring your entire system is optimized for comfort and efficiency.
Is a Rinnai Combi Boiler system good for In-Floor Radiant Heating or Multi-Zone homes?
Yes, Rinnai Combi Boilers are excellent for these applications, but the system must be designed by an expert to ensure efficiency and prevent damage.
Slab Protection: Precise temperature control is required to prevent the concrete slab from cracking due to thermal shock.
Smart Circulation: A variable speed pump is essential to automatically adjust water circulation based on pipe resistance in different zones.
Hydraulic Separation: For multi-zone systems, using proper manifolds and a Low Loss Header is critical to decouple the boiler flow from the system flow. A bypass loop may also be necessary depending on the setup.
Advanced Sensing: The system should utilize communicating slab sensors and an outdoor reset sensor to modulate heat output according to the actual weather conditions.
Sizing & Capacity: It is most important to calculate the Domestic Hot Water (DHW) demand to choose the right unit. In some cases, a buffer tank is needed to compensate for high demand.
4Most Energy Professional Services: We provide all necessary devices, expert system design, and free consultations for in-floor heating projects.
What is the best replacement option for my existing boiler?
The Rinnai I-Series is engineered as a superior retrofit solution for replacing older technology or failing combi boilers. It is an ideal, high-efficiency upgrade for homeowners currently using:
Flow Max
Baxi
Viessmann
Bosch
Navien
Older Rinnai models
Get Instant Professional Advice: Feel free to get professional advice right away! Talk with an expert on WhatsApp for free to discuss replacement options for your specific unit.
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 with 4Most Energy?
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 the Boiler 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 boiler installation typically cost in Toronto and Southern Ontario?
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 standard warranty on a Rinnai Combi Boiler?
When installed by a licensed professional like 4Most Energy, the Rinnai I-Series typically comes with industry-leading coverage:
Heat Exchanger: 12 Years
Parts: 5 Years
Labour: 1 Year (Standard)
Extended Labor Warranty Option: You can extend your labor warranty coverage up to 10 years. Ask the 4Most Energy sales department for details on our protection packages.
Understanding Your Coverage:
What "Labor Warranty" Means: If a part covered by the manufacturer's warranty fails, you do not pay for the labor to replace it.
After Warranty Expires: Once the labor warranty period ends, you are responsible for paying the service call fee and the labor cost for replacing any parts.
4Most Energy - Authorized Warranty Support: As an Authorized Rinnai Service Provider, 4Most Energy handles the entire warranty process for our clients. If a defect arises, we can directly claim, supply the parts, and replace the defective items, ensuring a seamless and hassle-free experience for you.
Does 4Most Energy warranty the installation work?
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 a 4Most Energy comprehensive maintenance visit?
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 the heat exchanger critical 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 situations can void my Rinnai Boiler warranty?
Yes, it can. Warranty coverage is contingent on proper care and use of the unit. Your warranty may be voided due to:
Poor Maintenance: Failures caused by scale buildup or poor water quality are strictly not covered.
Unauthorized Installation: Units must be installed by a licensed professional. DIY or unauthorized installations often void warranty terms.
Improper Usage/Application: Using residential equipment for commercial applications (e.g., in a busy restaurant or hotel) or operating the unit outside of its design specifications.
Lack of Maintenance: Failure to perform annual service can lead to premature failure that manufacturers will not cover.
Regular annual maintenance by an authorized provider is the only way to prove you have cared for the unit, protecting both your investment and your warranty coverage.
Why choose 4Most Energy for my Rinnai Boiler installation?
We are not just a general HVAC company; we are Authorized Rinnai Hydronic Experts serving homeowners across the Greater Toronto Area and Southern Ontario.
Fair Price & 5-Star Quality: We are not the "cheap guy" who cuts corners, nor are we an overpriced corporation. We offer fair, transparent pricing for high-quality craftsmanship, always striving to earn a 5-Star Review after every job.
Local Stock & Reliability: We stock critical Rinnai parts in our local warehouse. If your heat goes out in January, we minimize downtime from days to hours.
Direct Access to Experts: You deal directly with a Master Technician, not a commission-based salesperson. We design your system correctly from Day 1.
Warranty Guardianship: We handle your unit registration and stand as your advocate with the manufacturer.
What happens if my boiler stops working in winter?
4Most Energy customers get priority support. You speak directly to a boiler expert, not a call center. Because we stock genuine Rinnai parts locally, we can often diagnose and fix issues faster than companies that have to wait for shipments.
Do you provide boiler repair services ?
Yes. We are comprehensive hydronic specialists. We service, repair, and maintain all major makes and models, including:
Viessmann
Flowmax
Baxi
Navien
NTI
And many others. The Rinnai Advantage: While we are experts on all brands, for Rinnai systems specifically, we stock all parts locally. This means if you have a Rinnai boiler, we can typically solve your issue on the very first visit without waiting for parts to ship.
Do you offer financing On Rinnai Boiler?
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.
I am a DIYer/Contractor. Can I buy just the unit?
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.
