Mammoth Plumbing: A Rinnai Certified Contractor

Why Mammoth Plumbing Recommends Rinnai?

Rinnai-slider-2-1Only Rinnai offers the quality and reliability that is built on a 45 year history of innovation and improvements. Rinnai commands quality through in-house design, engineering and manufacturing, and insures your satisfaction with in-house support.

Leading the industry. Around the world.

Rinnai is fiercely committed to delivering nothing less than our absolute best. Their passion for constant improvement drives them to create incredibly innovative water heating and home heating gas appliances for both residential and commercial applications. As a result, their products have continued to lead the industry. In fact, sophisticated, efficient performance makes Rinnai Tankless Water Heaters some of the best tankless water heaters on the market.

Quality Standards

Throughout the world, their standards for quality remain unsurpassed. All factories are ISO 9001 and/or ISO 14001 certified. All products distributed in North America have been approved by the Canada Standards Association (CSA) and adhere to the strict standards of American National Standards Institute (ANSI).


But just as important as engineering and manufacturing a sound product, is offering support both before and long after it’s installed. They offer professionals support 24/7/365 with industry-leading warranties and a network of independent dealers trained on everything from product selection to installation and repair

Why Tankless?

It’s a whole new way to think about water heating. An endless supply of hot water, whenever you need it—even for multiple tasks at the same time. Tankless Water Heaters revolutionize comfort, energy efficiency and convenience. Browse the tabs below to learn more.

Endless Hot Water

Always have fresh hot water at your finger tips. Rinnai tankless water heaters deliver an endless supply of hot water whenever you need it. Shower, wash dishes, and do laundry at the same time without running out.

Save Money

Experience the energy savings from tankless water heating. Rinnai tankless water heaters save money on your energy bill by heating water only when needed, unlike a traditional tank-style water heater that heats and reheats water all day long.

Save Space

Conserve energy and save space with flexible installation. Rinnai tankless water heaters are a fraction of the size of tank-style water heaters. They are easily mounted on virtually any wall, inside or out, providing more space.

Peace of Mind

Tankless lasts 2x longer than traditional water heaters. With a typical life expectancy of up to 20 years, Rinnai tankless water heaters last longer than tank-style heaters. Plus, they’re covered by a 12-year limited heat-exchanger warranty.


Bring greater efficiency to your home and life. With efficient technology, Rinnai tankless water heaters produce less CO2 than tank-style water heaters. ENERGY STAR qualified and up to 96% efficient, they deliver reliability.

Mammoth Plumbing Rinnai Tankless Installations


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