combi boiler

Are you looking for a boiler that would solve all the water heating demands and issues of your home? A combi boiler may be the right choice for you. Combining the features of different boilers in one, it proves to be an effective central heating system for your hot water needs.

In this article, we’re talking about what they are, understanding what makes them different, and discussing the top brands that sell combi boilers in top Canadian cities including Vancouver, Edmonton, Calgary, and more.

What is a Combi Boiler?

A combi boiler, which stands for “combination boiler,” is a space-saving heating appliance that combines a water heater with a central heating boiler. Combi boilers are able to do away with the requirement for a separate tank to store hot water since they can draw hot water “on demand” from the cold water mains whenever you switch on the water.

How Do Combi Boilers Differ from Other Types?

As the name implies, tankless water heaters do not have a storage tank for hot water. The water in a tankless natural gas boiler or electric boiler is heated immediately as it passes through the device, though, therefore it is often exclusively used to heat water for residential use.

Conventional boilers or regular boilers, usually heat water and store it in a tank or hot water cylinder. Typically, these systems are interconnected with a bigger system of radiators and hot water pipes that make up a central heating arrangement.

In contrast, combi boilers are better than conventional boiler systems because they combine water heating and central indoor heating into a single unit, space-saving equipment, without the need for a separate cylinder or storage tank. These boilers are incredibly energy efficient and take up very little room by collecting water straight from the mains supply and heating it as needed, whether for hot water or heating and supplying it with a hot water tap.

Benefits of Combi Boilers

  • Save Money on Energy Bills: Combi boilers can help you save money on energy bills by heating water only when it’s needed.

  • Space Saving: They save a lot of room since they consolidate the function of heating and hot water systems into one.

  • Water on Demand: With the mains water supply turned on, they deliver an endless supply of hot water quickly.

  • Reduced Installation Cost: Installation is typically less complicated and costly due to the absence of a hot water storage cylinder or tank in the loft, which reduces plumbing requirements.

  • Lower Maintenance Costs: Due to the reduced number of moving parts, combi boilers often require less maintenance than traditional systems.

What Are Customers Saying?

Check out some of our latest reviews.

Braeden RigbyBraeden Rigby
19:47 25 May 24
Comfort Union should be your first choice for all your HVAC needs. Amazing family run business with a people first approach that is difficult to find. Highly recommended for anyone that values quality work !
premnath parthibanpremnath parthiban
14:52 23 May 24
I spent almost one year to find the best HVaC replacement company and finally landed with Comfort union .I initially thought it was a small job but then realized the magnitude of work and effort it goes into it ..Asif initially came to my house , explained to me everything in detail including what is code of guidelines expected by city of Calgary , that showed his knowledge on the whole process ..Then came his brother Moore for installation - you will never find such a wonderful person who knows in and out of the HVAC and moreover the most patient person I have ever seen .. he did the whole installation with absolute craftsmanship and love for the work he did .. the best part was his perfectness and every work he did was so perfect and tidy !Finally, came Khan ji - to do the final inspection to add perfectness over the perfectness carried by Moore .. He did inspection and made sure everything was 200% correct ..Overall , I would recommend comfort union over any other service provider …Replaced my furnace , water tank and my humidifier …
JJ YanJJ Yan
02:22 22 May 24
Muhamad and Darryl did an excellent job on installation of our new Bradford White 75 gallon water heater. Extremely professional and hard working. They not only just did the work, but also explained the procedure thoroughly and maintenance focus points. Kept the work place tidy and in order. Highly recommended to everyone. JJ
mr2008 2.0mr2008 2.0
04:08 12 May 24
excellent carrier furnace and air conditioner installation, highly recommend to others
20:52 06 May 24
It was great to see a father and son team work so professionally in the delivery and installation of our new Bradford White water heater. Thanks team for a wonderful job.
Arman GillArman Gill
03:21 30 Apr 24
Friendly staff and did amazing work with carrier hvac
Inderpal SinghInderpal Singh
02:59 30 Apr 24
Amazing work. Good work on AC installation. Competive rates
Fast response due to the urgent occasions. The team is very experienced. Highly recommended!
Tushar AroraTushar Arora
23:04 06 Apr 24
Comfort union offers top notch furnace and hot water tank replacement services - contact the best furnace company in Calgary for all your needs. Highly recommended!!
Dipendra SitaulaDipendra Sitaula
18:28 02 Apr 24
Great and reliable service.
sunny Maharjansunny Maharjan
10:11 01 Apr 24
Best reasonable and quick in their response.
E TanE Tan
01:45 31 Mar 24
I recently hired Comfort Union to install a new hot water tank in my home, and I couldn't be more pleased with the results. They went above and beyond to ensure that the installation process was smooth and hassle-free from start to finish.Daryl's expertise and professionalism were evident from the moment he arrived at my home. He took the time to assess the layout of the space and discuss the best options for the installation, providing valuable insights and recommendations along the way. His attention to detail and commitment to quality craftsmanship were truly commendable.Throughout the installation process, Daryl and Mo worked efficiently and diligently, ensuring that everything was installed correctly and functioning optimally. They were respectful of my home, taking care to clean up any messes and leaving the work area spotless once the job was complete.I would like to extend my sincerest thanks to the entire team at Comfort Union for their outstanding service. Thanks to their expertise and dedication, I now have a reliable water heater that meets my needs perfectly. I would highly recommend Comfort Union to anyone in need of plumbing services – their professionalism and quality workmanship truly set them apart.
Ayaan DawoodAyaan Dawood
06:38 10 Mar 24
Imran Ahmed KhanImran Ahmed Khan
06:04 10 Mar 24
Maggie VaccaroMaggie Vaccaro
21:26 05 Mar 24
Quick response for appt. Came over and got all work done.Will call them again and will recommend them to others. Thanks!
Ashirul PatelAshirul Patel
22:57 26 Feb 24
We had great experience. They work out an efficient way to solve our furnace issues while maintaining the minimum cost.
Rakesh SachdevaRakesh Sachdeva
04:44 10 Feb 24
Muhammad is very professional and very cooperative. He has completed the work as explained. Everything was completed on same day we had issue. Very responsive.
Kly ClackKly Clack
22:28 08 Feb 24
Team at comfort union made me feel very comfortable about my purchases explained everything clearly and concisely so I could be confident in my decisions I would recommend them to anyone who asks.
Bhattarai AnuragBhattarai Anurag
02:33 07 Feb 24
Good service 👍🏽
Matt MelliesMatt Mellies
21:21 22 Jan 24
I had an issue with my furnace, went to reset my main breaker to power cycle trying to troubleshoot it... Breaker crapped out so I was sitting on an electrical, and furnace problem.Gave these guys a call and they were able to come out within 2 hours. Required a full main breaker replacement, and new gas valve on my furnace. They diagnosed it in only a couple hours, and fixed everything the same day.Had a great experience, the technicians that showed up were professional, and very knowledgeable. I'll definitely be using these guys when I eventually have replace my aging furnace.
Sharif ZayedSharif Zayed
00:15 22 Jan 24
Khan was so kind and considerate to help me during the -45 C calgary weather. We decided to replace our old furnace with newer and advance features choosing Carrier Furnace. We received the quote from Comfort Union which was competitively priced and the job was completed next day. Thanks.
Syed Zaigham RizviSyed Zaigham Rizvi
05:29 18 Jan 24
Had a bit of a crisis with rental property heating system in Calgary, our Goodman furnace gave out and had countless furnace repairs over the years. They got a new Carrier furnace installed quickly and very competitively priced compared to other carrier dealers. Wasn't expecting such quick service in the cold months. Definite recommend!
Mohammed SiddiqiMohammed Siddiqi
00:23 06 Jan 24
Absolutely stellar service from this HVAC company! The team was prompt, professional, and incredibly knowledgeable. They swiftly diagnosed and fixed our heating issue with precision. Their attention to detail and commitment to customer satisfaction truly set them apart. A 5-star experience – our go-to HVAC experts!
Agit KokuAgit Koku
21:40 13 Apr 23
I recently had Comfort Union come to my home to fix an issue with my hot water tank's pilot issue. Not only did the technician promptly fix the issue, but they also took the time to clean out my drain as a courtesy. I was impressed by their attention to detail and their commitment to providing excellent customer service.I would highly recommend Comfort Union for anyone in need of plumbing services.

The Most Popular Combi Boiler Brands


Noritz uses a heat exchanger to make its combi boiler work efficiently, made of long-lasting, highly corrosion-resistant 316L stainless steel, which contributes to the brand’s stellar reputation for innovation in combi system boiler technology. Their modern combi boilers are far more efficient and last much longer because of this material choice. Noritz boilers are among the most eco-friendly options available because they produce very little nitrogen oxide.

Dual Stainless Steel Heat Exchangers:

The dual 316L stainless steel heat exchangers used by Noritz combi boilers heat water efficiently while offering exceptional durability and longevity as well as preventing corrosion and wear. The boiler’s longevity and efficiency are both improved by this material choice.

Outdoor Temperature Reset Control:

With this function, the boiler can sense the outside temperature and change the heating temperature accordingly. It does this by minimizing energy use in moderate weather and increasing it in colder ones, maximizing comfort and efficiency.

High Flow Rates:

The high flow rates that Noritz combi boilers are capable of allowing them to provide big amounts of hot water on demand. This is especially helpful in houses where there are several bathrooms or when there is a high demand for hot water at the same time, as it guarantees a constant temperature and flow without any disruptions.

Eco-Friendly Emissions:

Noritz boilers are designed to emit incredibly low levels of nitrogen oxide, frequently falling short of even the most demanding environmental regulations. For homeowners looking to lessen their impact on the environment, this makes them a great option.

Noritz NRCB199: Suitable for larger households and colder climates, this type serves a dual purpose by simultaneously heating the space and providing hot water without reducing the temperature. It can handle flows of up to 11.1 gallons per minute and has an AFUE rating of 95%.


The I-Series combi boilers from Rinnai are well-respected for their dependability and accuracy. Consistent and fluctuation-free delivery of residential hot water is assured by their innovative servo-based bypass control, which allows for precise temperature adjustment. The self-cleaning heat exchangers of Rinnai combi boilers are another reason for their popularity; they save maintenance time and keep the boiler running for a longer period of time.

Self-Cleaning Heat Exchangers:
Rinnai combination boilers have heat exchangers made of self-cleaning stainless steel, which eliminate the need to manually clean the boilers after each use. The unit’s efficiency and performance are preserved over time without the need for frequent maintenance, and its operational life is extended as a result.

Compact Wall-Mounted Design:
The space-saving wall-mounted design of Rinnai’s combi boilers is a major selling point. By doing away with cumbersome tanks, this is perfect for houses with limited space or for individuals who want a more minimalistic lifestyle, as it allows for more usable indoor space.

Multiple Heating Zones:
The ability to set separate temperatures for different parts of the house is a great feature of these boilers, which allows for greater personalization of heating conditions. By just heating occupied spaces, this function boosts comfort and perhaps reduces heating expenses.

High AFUE Ratings:
Rinnai combi boilers are known for their exceptional energy efficiency, leading the market in AFUE (Annual Fuel Utilization Efficiency) ratings. Owing to this efficiency, energy bills go down and the negative effects on the environment are lessened.

  • Rinnai i060CN: With an input rating of 60K BTU, the Rinnai i060CN model is capable of delivering hot water as well as heating. It can handle moderate hot water demands and is hence ideal for compact dwellings.

  • Rinnai i120CN: With a maximum domestic hot water flow rate of 9.8 GPM and an increased input rating of 120K BTU, the Rinnai i120CN is an ideal choice for bigger houses. It can manage numerous hot water usage at once and has a reputation for strong output.


The high-performance combi boilers made by Navien are well-known for their ability to handle the needs of larger homes. Without sacrificing efficiency or comfort, Navien’s NCB series can supply hot water to numerous outlets at once with its hot water tank. The revolutionary design of these system boilers includes recirculation pumps that supply hot water more quickly, and they are prepared to use hydrogen as a fuel source in the future.

Hydrogen-Ready Technology:
By making its combi boilers hydrogen-ready, Navien has set itself up for potential fuel technology shifts in the future. The ability to run on a hydrogen blend makes these appliances long-lasting and resistant to impending energy shifts.

Built-In Recirculation Pumps:
Navien combi boilers typically include recirculation pumps for household hot water already installed. There is no need to wait for the water to heat up before using it, and a lot less water is wasted, thanks to these pumps, which distribute hot water instantly throughout the house.

Digital Display Panels:
Standard on all Navien boilers is an intuitive digital display panel that shows you exactly how much energy you’re using, the state of your system, and any problems that may arise. Homeowners are able to manage their heating systems better and quickly resolve any faults because of this accessibility.

Outstanding Energy Efficiency:
When paired with suitable controls, Navien combi boilers can achieve impressive energy savings, often earning ErP A+ ratings to lower energy bills. Saving money and reducing one’s carbon impact are both possible outcomes of this degree of efficiency, making it much better than a regular boiler.

  • Navien NCB700: Large properties with high hot water demands can benefit from the Navien NCB700, a high-capacity type that can deliver up to 22 liters per minute with a precise water pressure. It has a 15:1 turndown ratio, so you may regulate the heat precisely to your needs.

  • Navien NCB500: With its space-saving and adaptable design, the Navien NCB500 is perfect for typical homes because to its excellent efficiency and comfortable operation. Its small footprint makes it easy to store in a kitchen cabinet.

Combi boiler Installation in Canada

If you’re looking for the most efficient combi boiler installation in Canada, Comfort Union can be a top choice for you. We offer several HVAC services – from the installation of these systems to their maintenance and repairs.

So if you’re ever looking to upgrade your existing boiler with a better, more efficient one, you know who to reach out to. Our HVAC experts have been working for several years in the field and know how to handle every issue and demand effectively while ensuring customer satisfaction.

Want to know more about our services? Reach out to us today!

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