Commercial Tankless Water Heater

Commercial Water Heating Solutions


Rinnai Tankless Water Heaters produce an endless supply of hot water to suit even the most demanding applications—from restaurants to hotels to multifamily residences to schools and more.

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Peak efficiency is about working less, not more.

Unlike traditional commercial tank-style water heaters or boilers, Rinnai Tankless Water Heaters operate only when needed so they’re inherently more efficient right from the start. Plus, as a part of our Tankless Rack System, modulating units sync up as needed, rotating and working together to get the job done. So they’re working less—using minimal energy—to save you more.

Condensing technology conserves even more energy, providing an Energy Factor of up to 0.96. Exact temperature control and other efficiency features all add up to top energy performance that reduces CO2 emissions and contributes to LEED® certification for both new construction and retrofit projects.

How Condensing Technology Works

Condensing appliances use the latent heat of exhaust to preheat incoming cold water. The colder the inlet water, the higher the efficiency and the more condensate is generated.

How Modulation Works

The chart below demonstrates the efficiency that a fully modulating tankless system can provide. The chart generally shows the gas usage of a traditional boiler compared to that of a Rinnai Tankless Water Heater.* Peaks represent the tankless unit meeting user demands, and valleys represent saved energy in between.

*The comparison is not based on data from a specific installation.

Where the demands are greatest, Rinnai delivers.

Nearly 100 years ago, we at Rinnai established a tradition of never settling for less than the absolute best—a tradition that has grown even stronger today.

Leveraging decades of global commercial water heating experience, Rinnai Tankless Water Heaters deliver performance and reliability. Precision engineering allows Rinnai Tankless Water Heaters to produce an endless supply of hot water to suit even the most demanding applications—from restaurants to hotels to multifamily residences to schools and more—conserving energy that can save thousands of dollars in capital, operational and life cycle costs, while providing redundancy and saving space.

But it’s not just performance that sets us apart. Our commitment to safety, quality and support has made us the #1 selling tankless brand in the U.S. and Canada.

From products to service and everything in-between, our dedication to delivering our absolute best never wavers. We’re stronger than ever, so that your confidence in choosing Rinnai can be too.

As reliable as the day is long.

Precision-engineered Rinnai Tankless Water Heaters provide an endless supply of hot water, without interruption, day in and day out. Rinnai quality is manufactured rock-solid reliable—you can safely stake your reputation on it.

Use Rinnai Tankless Water Heaters with or without a storage tank, or bank multiple units together in the Rinnai Tankless Rack System for the added benefit of modulating technology and redundancy.

When one unit is down, another takes over so that your hot water supply never runs dry, and your operation doesn’t miss a beat.

Trustworthy products start with reliable service

At Rinnai, our commercial water heating solutions are designed and tested to deliver the utmost in performance and dependability. Before our products ever reach customers, they’re rigorously tested at our on-site, CSA-certified laboratories. But just as important as engineering a sound product is offering a strong support system.

That’s why we’re here for professionals with 24/7/365 technical support and on-staff application engineers to assist with sizing and product selection. Not to mention a large national network of wholesale distributors, so that products and replacement parts are always easily accessible and field-supplied.

For a free sizing consultation and to receive product specifications and other technical documents, contact us below or call 866-383-0707. Rinnai Tankless Water Heaters are also available as Autodesk® Revit® Building Information Models, accessible at

Want to know more?

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View and download product documents

Warranty Coverage

For even more peace of mind, the Rinnai Tankless Water Heater commercial warranty includes:

  • 5-year heat exchanger
  • 5-year parts
  • 1-year labor, extended to 2 years when registered within 30 days of purchase*

For complete warranty details, visit or call 1-800-621-9419.

* Optional extended limited labor warranty includes coverage for up to five years from the date of purchase on specific models. See complete warranty for details.