Any Home. Any Season. One System.
Upgrade to a high-efficiency heat pump to heat and cool with one system, reduce energy costs, and get up to $7,500 in rebates.
Powerful, Reliable
Boilers for Every Home
Keep your home cozy with our high-efficiency residential boilers. Designed for comfort, built for lasting performance.
High-Performance Residential Boilers for Ultimate Comfort
Keep your home warm and energy-efficient with our reliable boiler collection. Discover advanced heating solutions designed to deliver consistent comfort.
Boilers With 4most energy
Rinnai IP120S Heat Only Boiler 120,000 BTU I-Series Plus
Rinnai IP150S Heat Only Boiler 150,000 BTU I-Series Plus
Rinnai IP090S Heat Only Boiler 90,000 BTU I-Series Plus
Rinnai IP150199C Combi Boiler Large House
Rinnai IP120199C Combi Boiler Large House
Rinnai IP090160C Combi Boiler
The Rinnai IP090160C Combi Boiler is a compact, ENERGY STAR® certified boiler for medium-to-large Ontario homes (2,000–3,000 sq. ft., 3–4 bathrooms). It provides 90,000 BTU/h heating and 160,000 BTU/h hot water, achieving a 96% AFUE rating and utilizing Smart Sense™ technology for efficient gas or propane use.
Rinnai IP060160C Combi Boiler Town House
High Efficiency Boilers
Reliable Warmth for the Toughest Ontario Winters
Upgrading your boiler isn’t just about replacing equipment, it’s about choosing a system that’s properly sized, professionally installed, and built to last in Ontario’s winter climate. At 4Most Energy, we handle everything from selecting the right brand to complete installation with no hidden fees. You get a high-efficiency heating system, lower energy bills, and long-term comfort backed by certified boiler experts across the Greater Toronto Area and Southern Ontario.
Why Ontario Homeowners Choose 4Most Energy for Boiler Supply & Installation
✅ Lower Energy Bills with High-Efficiency Boilers
Modern condensing boilers drastically reduce energy waste through smart modulation and efficient heat exchangers, helping you cut down on gas consumption and monthly bills.
✅ Fair, Transparent Pricing, No Hidden Extras
We offer honest, upfront quotes that include all essential accessories (pumps, valves, venting, piping, etc.) with no surprise add-ons or inflated fees. What we quote is what you pay.
✅ Flexible Financing for Every Home & Budget
Your new boiler can be installed as low as $0 upfront.
We offer multiple financing options through trusted Canadian lenders:
✅ Longer Lifespan, Backed by Warranty
With lifespans of 15–20 years, 4Most Energy installed systems come with full manufacturer warranties and post-install support.
✅ Dedicated Customer Service & After-Installation Support
Get 4Most Energy's support 7 days a week. Enjoy quick emergency responses, annual service reminders, remote troubleshooting, and priority for existing customers. Real help, no call center hassle!
✅ 30-Day Customer Satisfaction Guarantee
At 4Most Energy, we provide a 30-Day Satisfaction & Return Policy with every boiler installation to ensure homeowner confidence and satisfaction.
Boiler & Heating Solutions
Stress-Free Boiler Installation
From your first call to final start-up, 4Most Energy certified boiler experts handle everything
4Most Energy Boiler Services
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.
Unlike many contractors, 4Most Energy includes it all
Devices & Materials Included in Boiler Installation
Complete installation package with all required components.
Performance & Protection Upgrades for Your Boiler
Optional Add-On Devices & System Upgrades
Enhance your boiler’s efficiency, comfort, and reliability with professional upgrades by 4Most Energy.
Rinnai Boilers
Rinnai boilers deliver reliable heating and hot water with advanced condensing technology. Available in both heat-only and combi models, they adapt to natural gas or propane and save space — perfect for new builds or retrofits. With stainless steel heat exchangers, low-maintenance design, and widely available parts, Rinnai ensures efficiency and performance. Each system includes a 15-year heat exchanger warranty, 5-year parts warranty, plus 1-year labor coverage from 4Most Energy
Why Choose Rinnai Boiler with 4Most Energy?
Guaranteed best pricing on Rinnai boilers
Factory-trained technicians for expert installation
Extended maintenance plans from 4Most Energy
New NCB-H & NFC-H Series
Navien Boilers
High-Efficiency Wall-Hung NAVIEN Boiler
Navien is a global leader in high-efficiency condensing boilers, combi boilers, and water heaters, trusted in more than 30 countries. At 4Most Energy, we install, service, and maintain both Navien heat-only and combi systems. Designed for maximum efficiency, these boilers provide reliable home heating and endless hot water in one compact system. Every Navien comes with a 5-year parts warranty and a 15-year heat exchanger warranty, plus 4Most Energy adds a 1-year labor warranty for complete peace of mind.
Why Choose Navien with 4Most Energy?
Market innovator in high-efficiency combi & condensing boilers
Provides heating and hot water in one compact design
5-year parts + 15-year heat exchanger warranty
Extra 1-year labor warranty from 4Most Energy
Professional installation & maintenance by certified experts
TFTN & FTVN Series
NTI Boilers
High-Efficiency Wall-Hung NTI Boiler
At 4Most Energy, we proudly provide NTI Boiler systems, Canadian-made, widely available, and trusted for reliability. With a simple design and parts that are easy to source, NTI is a budget-friendly choice for homeowners. Perfect for new builds, infloor heating glycol systems, and hydronic applications, our factory-trained NTI technicians deliver professional installation, service, and maintenance at competitive prices.
Why Choose NTI Boiler with 4Most Energy?
Large availability of NTI boilers & parts in Canada
Canadian-made quality, designed for long-term efficiency
Suitable for new homes, in-floor heating & hydronic systems
Competitive pricing with professional installation & service
New NCB-H & NFC-H Series
Vissmann Boilers
High-Efficiency Wall-Hung NAVIEN Boiler
Navien is a global leader in high-efficiency condensing boilers, combi boilers, and water heaters, trusted in more than 30 countries. At 4Most Energy, we install, service, and maintain both Navien heat-only and combi systems. Designed for maximum efficiency, these boilers provide reliable home heating and endless hot water in one compact system. Every Navien comes with a 5-year parts warranty and a 15-year heat exchanger warranty, plus 4Most Energy adds a 1-year labor warranty for complete peace of mind.
Why Choose Navien with 4Most Energy?
Market innovator in high-efficiency combi & condensing boilers
Provides heating and hot water in one compact design
5-year parts + 15-year heat exchanger warranty
Extra 1-year labor warranty from 4Most Energy
Professional installation & maintenance by certified experts
Boilers Frequently Asked Questions
Why is Rinnai considered the best and most reliable boiler brand?
Rinnai is widely recognized as one of the most durable and long-lasting boiler brands on the market. Their Japanese engineering, stainless-steel heat exchangers, and extremely high efficiency make them a top choice for homeowners who want performance, reliability, and minimal maintenance. Rinnai parts are easy to source across Canada, and the brand is known for providing excellent long-term support, which is why 4Most Energy recommends Rinnai for customers who want the best overall value and lifespan.
+ What makes Navien a good brand for warranty and part support?
Navien offers one of the strongest manufacturer warranties in the industry, often up to 10 years on parts, depending on the model. Its parts are widely available in Ontario, and Navien maintains excellent technical support for installers and homeowners. If you want a high-performance boiler with long warranty coverage and outstanding after-sales support, Navien is one of the most reliable choices, especially when installed by certified contractors like 4Most Energy.
Is NTI a good choice for budget-friendly boiler installation?
Yes. NTI boilers are a solid budget-level option for homeowners who want an efficient system without the premium cost of Rinnai or Navien. NTI offers good efficiency ratings and acceptable performance, and when installed properly, they can last many years. NTI is ideal for customers looking for affordability while still receiving professional installation and warranty-backed service.
Why is Viessmann more expensive, and what should I know about parts and warranty in Canada?
Viessmann is a premium European brand known for its engineering and performance. However, in Canada, parts availability and warranty support are more limited compared to Rinnai or Navien. Wiessmann boilers are also more expensive to install and maintain. For customers prioritizing longevity and serviceability in Ontario, Rinnai and Navien offer stronger long-term value due to easier parts access and faster warranty handling.
How does the boiler estimate process work with 4Most Energy?
We make it simple and transparent:
Quick remote estimate: Provide basic details about your home, installer photos, and boiler location.
No-surprise site check (if needed): We visit to verify venting, gas line, piping, and equipment requirements.
Official estimate in 20 minutes: You receive a full breakdown — including installation, essential accessories, venting materials, fittings, and labour.
Guaranteed no hidden fees: What we quote is exactly what you pay.
4Most Energy is known for honest pricing and transparent installation packages.
Why choose 4Most Energy for boiler installation in the GTA & Southern Ontario?
Because we specialize in boilers, not just generic HVAC. Our technicians install hundreds of boilers every year and follow strict code-compliant installation procedures. We cover Greater Toronto, York Region, Peel, Durham, Hamilton, Waterloo, and Southern Ontario with certified boiler professionals who ensure better performance, efficiency, and lifespan for your system.
Why are 4Most Energy’s prices so competitive?
Because we buy boilers directly from major suppliers and include essential accessories at no extra cost, such as:
Primary/secondary piping
Proper venting materials
Isolation valves
Stainless or black iron piping where required
Other companies charge extra for these add-ons — but with 4Most Energy, they are included to guarantee your boiler runs safely and efficiently.
Why are accessories important in a boiler installation?
A boiler is not plug-and-play — it requires the correct venting, piping, expansion tanks, valves, pumps, neutralizers, and safety controls. Without these, you get:
Low efficiency
Noise issues
Frequent error codes
Shorter boiler lifespan
Warranty denial
4Most Energy includes all essential components standard, ensuring your boiler operates at peak performance from day one.
Does 4Most Energy offer labour warranty?
Yes, all installations include 1-year labour warranty, and you can extend it to up to 10 years with the 4Most Protect Plan. Combined with manufacturer warranties (up to 10 years parts), you are fully covered.
What happens if I need emergency service?
4Most Energy provides emergency boiler service across Toronto and the surrounding areas. Whether it’s a no-heat situation, a leaking unit, or an error code, our certified technicians can diagnose and repair your system quickly, even if we didn’t install the original boiler.
What is your 30-day customer satisfaction guarantee?
If you are not happy with your installation or boiler performance within 30 days, we will address the issue immediately. Our priority is that you’re fully satisfied with your new system, installation quality, and heating performance.
Get Your Boiler Quote Quickly & Confidently
We understand that requesting a quote is the first crucial step toward a comfortable home.
Fast Response: Our dedicated team prioritizes quote requests. Expect a call or email within one business day to confirm your details.
Expert Guidance: We handle everything from high-efficiency replacements to new installations. We'll ensure the boiler we recommend is perfectly sized and meets all Ontario safety standards.
No Obligation: Submitting this form is free. We provide transparent pricing and expert advice so you can make an informed decision.
Request Your 20-Minute Estimate
Our boiler expert will review your info, prepare an official estimate, and contact you within 20 minutes
Talk to a Real Technician
kip the call centers connect directly with a certified HVAC pro for honest answers.
Local Service You Can Count On
We’re proudly serving homes across the GTA fast response, trusted results.
Smarter Payment Options
Spread your cost with flexible monthly plans no surprises, just simple comfort.
Share Comfort, Get Rewarded
Invite friends or family when they book with us, you’ll both benefit.
