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RU Model Series

Super High Efficiency Plus

Product Specification

Energy Factor



Uniform Energy Factor



15,000 BTU (minimum)
199,000 BTU (maximum)

Installation Type

Indoor Only


Standard for Commerical

Enjoy an endless supply of hot water with the SENSEI™ RU199iN Super High Efficiency Plus condensing tankless water heater from Rinnai. Only the size of a small suitcase, the natural gas RU199iN model is compact, easy-to-install and perfect for indoor locations.

Up to twice the lifespan of most tanks
Never run out of hot water
Compact size to fit every space
Product Specificiation

Efficiency Rating (SEER)

Up to 17

Energy Star®



5-Year Limited Warranty on covered components including compressor. This product may be eligible for valuable 10-Year Limited Extended Warranty coverage with product registration.

Cooling Savings

10 SEER vs 21 SEER

Saved per year
5-Year savings
10-Year savings
15-Year savings

*Based on US National Average

Consistently Perfect

Precise Comfort® technology allows the furnace to keep the temperature held exactly where you want it. Heat is even throughout your home, with no cold spots. If it sounds perfect, it’s because it is.

No-Hassle Hot Water, When and Where You Need It

With a tankless water heater, your home’s cold water is heated only when you need it, and it stays hot until you’re done using it. This results in a limitless hot water supply and little to no wasted energy usage.


Flame ignites and heats two heat exchangers


Water preheats as it passes through the secondary heat exchanger


Water continues to heat to desired temperature as it passes through stainless steel primary heat exchanger


Water exits the unit and travels to the water fixture where it is needed


Flame output adjusts as needed to maintain water temperature during use


With usage complete, the flame turns off and water stops flowing

Technology & Features

Compact Size

Tankless water heaters are about the size of a carry-on suitcase, so they can fit in small spaces like closets, cabinets, and mud rooms.

Unlimited Hot Water

Because your water is continuously heated as needed, you’ll never have to choose between taking a hot shower, doing a load of laundry, or running the dishwasher.


Often eliminating the need to replace the unit. And many offer extended, comprehensive warranties.

Energy Efficiency

Rated by a Uniform Energy Factor (UEF), tankless water heaters are a highly efficient hot water appliance and ENERGY STAR® certified units offer additional energy saving benefits.


Accessories like room motion sensors and push-button water demand are available to help make hot water instantly available when it’s needed.

No More Waiting for Hot Water

Waiting for hot water can be frustrating, costly, and wasteful. Recirculating technology eliminates the wait, so hot water is always at the ready. Our technology permits this even if your home does not have a dedicated return line.

Better Than a Tank

  • Tankless water heaters last up to twice as long as tanks
  • Save energy by heating water only when it’s needed
  • Avoid costly replacement events with a maintainable and repairable tankless unit

Tankless water heaters can work with both natural gas and propane heat sources.

If your home runs on all-electric heat, tankless may still be a viable option.

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