16891 Oakmont Ave. Gaithersburg, MD 20877

Tankless Water Heaters Gaithersburg

It’s true! Endless hot water! It is as simple as that. Go ahead and put it to the test. Run multiple showers and do laundry at the same time. Tankless water heaters are designed to allow you to operate multiple plumbing fixtures throughout your home at the same time with no shortage of hot water. Call Advanced Plumbing & Drain today for a free in home estimate on the tankless water heater that is right for you!

What is a Tankless Water Heater?

A Rinnai tankless water heater only heats water when you need it. So you get an endless source of hot water, while also saving money on energy costs by not heating and reheating the same tank of water. When opening a hot water tap, or starting the dishwasher, the Rinnai tankless water heater recognizes the need for hot water and starts the heating process.


  1. The temperature of the incoming water is used to calculate how much heat the burners must produce to deliver water at the desired temperature.
  2. When the demand for hot water ceases the unit shuts down and uses no energy, waiting until more hot water is needed.
  3. The end result -- hot water that is not limited to what’s available in your tank. You always have clean, hot water when you want it for as long as you need it!


Why Tankless vs. a Traditional Tank?

Produce more hot water using less energy than the most efficient storage tank style heater. Tankless is the environmentally responsible water heating solution. It saves energy, saves space and saves you money.


Endless Hot Water
Rinnai tankless water heaters heat the water you need, when you need it. Turning any water source into hot water on demand. You are not limited to the amount a storage tank heater can hold. Whether you are washing the dishes, washing your clothes, or drawing a hot bath, Rinnai's tankless water heater technology will supply endless hot water to your lifestyle demands-even if you do them all at once!


Lower Energy Bills
Enjoy up to 40% energy savings with a Rinnai tankless water heater. Our units are designed to be highly efficient and only heat water when it is needed, a revolutionary advantage over inefficient tank-style heaters.


2x Rinnai tankless water heaters have a typical life of up to 20 years. This can be twice as long as a tank style unit!


Space Savings
Traditional tank water heaters can take up to 16 square feet of valuable floor space. However, Rinnai tankless water heaters are about the size of a carry-on suitcase and can be installed on virtually any wall inside or outside of your home.


Clean, Fresh Water
Traditional tank-style water heaters can build up rust and scale inside their tank, where the hot water you use for bathing and drinking is stored. With Rinnai tankless water heaters you will always experience fresh, clean water that is heated on demand, as it passes through the unit.


Sustainable and “Green”
Rinnai has earned by meeting the strict energy efficiency guidelines set bENERGY STAR approval y the U.S. Environmental Protection Agency and the Department of Energy, by using less energy and preventing greenhouse gas emissions.

Why Rinnai for Tankless Water Heaters?

Only Rinnai offers the quality and reliability that is built on a 45 year history of innovation and improvements. Rinnai provides superior customer support before and after the sale with an industry-leading 12-year limited warranty.

History and Experience
There are over 30 million Rinnai tankless water heater installations worldwide. Rinnai has been efficiently heating water since 1964. Rinnai is the world's largest gas appliance manufacturer

The Rinnai System
The Rinnai system is a comprehensive solution that takes advantage of the tankless water heater’s efficiency and flexibility. Use the efficiencies of your Rinnai tankless water heater to heat your home. Utilize controllers to set precise water temperatures, for multiple locations in your home. This ensures comfort and prevents scalding accidents. Further, Rinnai’s unique concentric venting system, for units installed inside the home, only requires one penetration for both intake and exhaust. This proprietary vent pipe takes the guess work out of using the proper materials, maximizing safety and space usage.

Awarded “Best Tankless Water Heater”
Rinnai is the 2010 Builders' Brand Leader as chosen by home builders in Builder Magazine. The Alliance to Save Energy awarded Rinnai their prestigious Super Nova Star Award for energy efficiency and Bestcovery.com chose Rinnai as The Best Tankless Whole-House Water Heater.

At Advanced Plumbing & Drain we offer a comprehensive tankless water heater tune-up. Call now to schedule this necessary service!



  1. Heat exchanger cleaning with solvent flush
  2. Remove and clean water inlet filter
  3. Inspect unit and piping for leaks
  4. Inspect for corrosion
  5. Check expansion tank
  6. Check water pressure
  7. Check for proper relief drain tubing
  8. Inspect electrical connections as needed
  9. Test voltage and amperage for unit operation
  10. Inspect and clean burner and inducer as needed
  11. Visual inspection of burner operation
  12. Inspect vent system and gas piping

Contact Advanced Plumbing & Drain

Looking for high quality & affordable plumbing services? Call our Gaithersburg plumbers today at 301-933-7331. We are available around the clock for emergency services and provide same-day services.

Contact Our Gaithersburg Plumbers at Advanced Plumbing & Drain Today!
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