Hot Water Ottawa

How To Find The Best Tankless Water Heater

How To Find The Best Tankless Water Heater For Your Ottawa Home

Looking for a new tankless water heater in the Ottawa area? That’s a smart move. Before you buy, though, be sure you do your homework. Learn all about the best water heaters in Ontario and how they differ from hot water tanks vs. tankless. We simplify your research with this guide to tankless hot water heater function, benefits, and top brands.

Looking for a brand comparison? Skip the rest of this content to read our comparison of Navien vs Rinnai vs Bosch.

Navien NPE-S2 SeriesWhat Is A Tankless Water Heater?

A tankless water heater can best be defined by what it isn’t. It isn’t like traditional hot water heaters, which heat cold water once it flows into a tank, and then continue to keep it hot for hours — or even days — until you are ready to use it. The process is energy-inefficient and wasteful. The water heater sizing depends on the demand of hot water for your home.

By contrast, a tankless heater avoids standby energy losses; it heats water only as needed, such as when you turn on the shower or faucet. Optionally – you can use a recirculating pump with your tankless unit for instant heat!

How Does A Tankless Water Heater Work?

  1. A tankless heater consists of a wall-mounted unit about the size of a suitcase, containing a burner (usually either natural gas or electric) and an internal computer. You can adjust the temperature setting by means of a thermostat.
  2. When you turn on your washing machine, faucet, or other hot water plumbing fixture, cold water is channeled into the tankless heater through the inlet pipe.
  3. The inflow of water is detected by sensors, which signals the computer to start the heating process.
  4. The computer sends a message to the internal burner to heat the incoming water.
  5. A heat exchanger circulates the water until it has reached the preset temperature indicated on the thermostat.
  6. The heated water flows out through an outlet pipe and makes its way along your home’s plumbing pipes to the spot where it is needed.
  7. The flow of hot water will continue as long as you wish, until the fixture is turned off.

Benefits Of Installing A Tankless Water Heater

The pros and cons of tankless water heaters are a lot more one-sided towards the benefits. Here are some of the pros of installing a tankless heater:

Offers Energy Efficiency. Because no standby energy losses are involved, a gas tankless water heater functions more efficiently than a hot water tank — saving energy, cutting your utility bills, and reducing your carbon footprint. Learn more about how a tankless water heater will save you money to help you decide. Natural Resources Canada reports that, on average, an Energy Star-certified water heater consumes 30 percent less energy than a conventional hot water tank. Although tankless heaters cost more initially, they are worth it.

Produces An Endless Hot Water Supply. Another advantage of a tankless water heater is that it can produce an endless supply of hot water whenever needed. You won’t ever again have to worry about running out or using up the contents of your water heater tank. This is especially good news if you’re tired of taking cold showers because someone else has used up all the hot water!

Lasts Longer Before Needing Replacement. You can expect a tankless water heater to last 20 years or longer, as opposed to an average lifespan of 8-12 years with a tank heater. (Constantly storing hot water shortens tanks’ lifespans.) This means you won’t have to lay out the cash to buy a new one so quickly.

Saves Space In Your Home. Because a tankless water heater is a trim rectangular box — instead of a big, clunky cylinder like a hot water tank — it doesn’t take up nearly as much room. You can have your tankless heater installed almost anywhere in your home, even a closet. Just make sure there is proper venting for a gas-powered water heater.

Should I Choose Condensing Or Non-Condensing Tankless Water Heaters

Although the two types cost about the same to buy, condensing tankless water heaters use fuel more efficiently than non-condensing versions. The reason is that a condensing vs. non-condensing tankless water heater captures and recycles residual heat, which is leftover from the heating process. As a result, it will reduce your operating costs.

This is why we ONLY provide condensing units to the people of Ottawa.

Condensing tankless water heater = approximately 96-98 percent efficiency.

Non-condensing water heater = approximately 80 percent efficiency.

4 Of The Best Tankless Water Heater Brands

At Hot Water Ottawa, we recommend the following brands. They are among the best tankless water heaters on the Barrhaven market today.

Navien Tankless Water Heater

Navien is a relatively new manufacturer, which offers only two tankless water heater lines — standard and upscale. However, their highly energy-efficient products are certified by both Energy Star and LEED. They recently opened a US-based plant. There are many outstanding Navien tankless water heater reviews.

Noritz Tankless Water Heater

Noritz America is a subsidiary of Japan’s Noritz Corporation, active in the water heater field for 70 years. Their tankless water heaters boast advanced features such as Wi-Fi compatibility, dual heat exchangers, and top-mounted water connections (to permit easy replacement of your old hot water tank).

Rinnai Tankless Water Heater

Rinnai tankless water heaters are known for their high performance, reliability, and generous warranty. This is an excellent brand when you would like to run several hot water fixtures at once. Their higher-end water heaters are certified by Energy Star, and the newest models are Wi-Fi capable.

Bosch Tankless Water Heater

Bosch is a famous, long-established engineering firm, which manufactures its residential water heaters in Europe. The company offers high-quality gas tankless water heaters at several price points.

Navien vs Rinnai vs Bosch


Navien Tankless Water Heater

Navien is a reputable brand known for its advanced tankless water heater technology and energy-efficient solutions. With their impressive energy efficiency ratings, Navien tankless water heaters are among the most cost-friendly options available. These units are equipped with smart technology, allowing for easy temperature adjustments and remote monitoring.

Navien water heaters are designed to be eco-friendly, reducing greenhouse gas emissions and promoting sustainability. For homeowners seeking a high-performing and cost-effective tankless water heater, Navien is an excellent choice.


  • Field convertible gas system
  • Ultra condensing efficiency
  • Dual stainless steel heat exchangers
  • Low NOx emissions (20ppm)
  • 2” PVC venting up to 75 feet
  • ComfortFlow built-in recirculation system

Most Efficient System

Navien NPE-210A2 is designed to optimize energy efficiency. It’s condensing models utilize innovative heat exchanger technology to capture waste heat, providing efficient heating and reduced energy consumption. NPE-210A2’s high-efficiency ratings (97% AFUE) make their tankless water heaters an eco-friendly and cost-effective choice for homeowners seeking long-term energy savings.

Most Cost Friendly

Navien offers a budget-friendly tankless water heater option in NPE-180A2. It delivers reliable hot water performance (150,000 BTU/h) at an affordable price. Homeowners will find this Navien unit can fit their budget without compromising on quality or efficiency. With Navien’s cost-friendly solutions, upgrading to an NPE-210A2 tankless system becomes accessible to a wider range of customers.


Rinnai Tankless Water Heaters

Rinnai is a leading brand in the tankless water heater market, offering high-performance units that combine efficiency and durability. With a focus on energy efficiency, Rinnai water heaters help reduce energy consumption and lower utility bills.

Their systems are equipped with innovative features like Wi-Fi connectivity and digital temperature control, allowing users to customize settings for optimal comfort. Rinnai’s commitment to quality and reliability ensures that their tankless water heaters are built to last, making them a cost-friendly investment in the long run.


  • Sleek, modern design
  • Energy Star™ certified
  • Smart-Circ™ Intelligent Recirculation™ technology
  • Last up to twice as long as tank hot water heaters
  • Isolation valves for extra protection
  • Natural gas or propane fuel

Most Efficient System

Rinnai’s RSC water heaters are renowned for their energy efficiency. Their RSC condensing models capture waste heat and utilize it to preheat incoming water, maximizing efficiency and reducing energy consumption. With superior energy efficiency ratings (0.91 UEF) and an Energy Star rating, the RSC tankless water heaters are among the most environmentally friendly and cost-efficient options in the market.

Most Cost Friendly

Introducing the Rinnai RUCS Series, where budget-friendly tankless water heater options meet uncompromising performance (160,000 BTU) and quality. Emphasizing cost-effectiveness, this series ensures reliable hot water and long-term savings without sacrificing excellence, even in their more economical models.


Bosch tankless water heater logo

Bosch is a well-established and trusted brand that offers a range of efficient and reliable tankless water heaters. With a commitment to innovation and cutting-edge technology, Bosch tankless water heaters provide a constant supply of hot water while minimizing energy consumption. Their tankless systems are designed to be highly efficient, helping homeowners save on energy costs and reduce their environmental impact.

Bosch tankless water heaters are known for their compact design, making them suitable for homes with limited space. Additionally, their user-friendly controls and advanced safety features ensure a hassle-free and safe experience. Whether you need a tankless water heater for residential or commercial use, Bosch has a solution that offers the most efficient system at a cost-friendly price.


  • Space-saving, state-of-the-art tankless design
  • Ultra efficient condensing technology with UEF up to 0.95
  • Wi-Fi accessory & App increases functionality
  • Top water connections for easy tank replacement
  • Ultra low NOx Certified
  • Non-condensing up to 24 units
  • Available in NG and LP configurations
  • Digital display for accurate temperature setting

Most Efficient System

Bosch Greentherm 9000 Series is designed with energy efficiency (0.95 UEF) in mind. Their high-efficiency burners and condensing technology maximize heat transfer and reduce standby heat loss, resulting in significant energy savings. With industry-leading efficiency ratings, the Bosch Greentherm 9000 Series minimizes energy consumption and lower utility bills, making them an eco-friendly and cost-effective choice for homeowners.

Most Cost Friendly

The Bosch Therm 830 ES caters to various budgets without compromising on quality. This cost-friendly unit provides excellent value for money, delivering reliable hot water performance (175,000 BTU/Hr) without breaking the bank. Homeowners can find the Bosch Therm 830 ES that suits their needs and budget, making them an economical and practical solution for hot water requirements.

We Carry The Best Water Heaters

Now you have the facts on the best tankless water heaters. Where do you find these uber-efficient appliances? Call Hot Water Ottawa, of course. Our expert Barrhaven water heater team is here to help you choose a tankless water heater that will give you the best performance.

Not yet ready to buy? No worries! Just rent a tankless water heater with convenient payment via your Enbridge gas bill.


Enbridge billing changes are coming soon! Learn how to make the payment switch today.