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Rinnai

Verified customer product ratings, model details, and review feedback.

Int CTWH 180k Btu 9.0gpm max w/Valve
R

Model: RUC90iN

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Int CTWH 180k Btu 9.0gpm max w/Valve

4.2 from 51 ratings

Super High Efficiency Plus 9.0 GPM 180,000 BTU Natural Gas Exterior Tankless Water Heater

  • Professional installation required; call 84-GO-Rinnai for assistance.
  • ENERGY STAR® Qualified with an Energy Factor of 0.96 / Uniform Energy Factor of 0.92
  • Equipped with Rinnai Circ-Logic™ - Pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation
CUSTOMER REVIEWS
5 Stars
53%
4 Stars
29%
3 Stars
11%
2 Stars
2%
1 Stars
4%

4.2 from 51 ratings

"Customer review"

Anonymous Apr 30, 2021

5.0

"Customer review"

Anonymous Feb 10, 2021

0.0

"Customer review"

Anonymous Jan 26, 2021

5.0

"Hot water cuts out in middle of shower"

Paul Oct 28, 2020

3.0

More than once in the middle of a shower, just a single person taking a single shower (dishwasher wasn't running, washing machine wasn't running, etc.) suddenly the hot water cuts out. I found if you turn off the hot water completely, count to 15, then turn it back on, it will begin to work again. At first I thought the device couldn't keep up but now I'm thinking it's on some kind of timer. All I know is it's very disconcerting to be in the middle of a shower and have the water suddenly go cold.

"Customer review"

Anonymous Feb 10, 2020

5.0

"great product!"

Anonymous Jan 22, 2020

5.0

"RG comments"

RG Jan 17, 2019

5.0

It was easy to install, adjust and what I love the most, endless hot water.

"Hot water is not as quick as promised!!"

SM1973 Dec 6, 2018

4.0

Only had it a month!

"Customer review"

swaller Nov 29, 2018

4.0

My unit has been installed and running now for about 2 months. I like the fact that I am not heating water all the time as in a 50 gallon unit and my Rinnai unit has been working great since it was installed. I do wish that I could get the temperature up above 120 degrees F. I read in the manual that there is a dip switch change that allows this but it would not go above 120.

"Reasonable value for the money but warranty registration could be easier"

Joe Nov 12, 2018

4.0

Met expectations

"Great to have all the hot water we need and don’t have to heat the old 50 gallon water heater any more "

J Nov 1, 2018

5.0

Meets all expectations. Just takes a bit more time for the hot water to make its longest destination

"Unsatisfied"

Anonymous Aug 25, 2018

2.0

Hot water takes over one minute to arrive at faucets. During shower or at kitchen faucet if you slightly turn down hot water it goes completely cold for 30 seconds or more before it eventually gets hot. This is extremely annoying!

"Rinnai Tankless Hot Water Heater"

Wally Aug 23, 2018

4.0

Have had system for about 3+ months and enjoy the unlimited availability of hot water for showers, especially when more than one person is showering at the same time. System in the garage had a minor gas leak but I was able to get the utility company rep. to repair it quickly ( he happened to be down the street). Works fine now.

"Customer review"

Anonymous Aug 18, 2018

4.0

"inconsistent "

not what i expected for the price Aug 10, 2018

1.0

hot water is not consistently available,does not meet expectations,installed may 2018,hot water takes to long to be available,can't mix hot and cold together with expected results

"Multiple surveys are not appreciated and/or necessary "

Anonymous Aug 10, 2018

4.0

So far.... works as promised.

"Customer review"

Anonymous Aug 10, 2018

5.0

"Not enough hot water"

Unhappy Aug 9, 2018

1.0

It does not provide enough hot water for 2 simultaneous showers although that's what we were specifically promised by the salesman for the installer, Morris-Jenkins, at a cost of several thousand dollars. If even a sink faucet is turned on, the shower flow is noticeably less.

"A bit disappointing"

tespo Aug 7, 2018

3.0

I had high hopes for this system, but the best I can say is that it has been inconsistent for us. We needed to get a re-circulator because it was taking up to 5 minutes for hot water to get to some parts of our 2400 s.f. house. Even now, there are still times we have to wait for the water to be fully hot. I am not going lower than a 3 rating, because I don't know if the problem has as much to do with the way it was installed and/or the piping system in our house (Which has one floor added from what was already there)

"Excellent hot water unit"

Jason L Aug 7, 2018

5.0

Amazing pre and post sales technical support. Staff was able to help me understand features, install considerations, and size the unit. Have had the unit roughly 6 months. It provides consistent and unlimited hot water to a household of 6. Have one unit that I used to replace two hot water tanks. Unit is providing substantial cost savings over previous setup.

1