rinnai i090CN Combi


RU199in RU Model Series

Super High-Efficiency Plus View Energy Guide

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

Get a no obligation quote on a New Rinnai RU199in Tankless Water Heater

We offer industry-leading warranty and installation services beyond trade standards. 


Tankless Water Heating
for the Home

With Rinnai Tankless Water Heaters, homeowners can enjoy an endless supply of hot water. Our tankless technology delivers hot water
wherever and whenever it’s needed, eliminating the need to prioritize tasks or schedule use. It’s a smarter solution.

• Control-R™ Wireless Module adds possibilities for remote monitoring and management
• Uses up to 40 percent* less energy than traditional systems

It’s also a more flexible solution. Models are available for nearly every type of home, each with a compact design that delivers endless installation options. Flexibility, convenience and reliability.

That’s the Rinnai difference.

Designed with the highest quality components, including high-performance
heat exchangers.

How Tankless Works

When the need for hot water arises by turning on a shower, washing machine, dishwasher or faucet, cold water enters the Rinnai Tankless Water Heater from the inlet pipe at the bottom of the model.

Water flows through the system and is heated
as needed to deliver all the hot water your
customers could need.

Rinnai offers tankless water heaters with both concentric and PVC/CPVC venting and integrated recirculation on the same model.