Rinnai Water Heaters Reviews

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Energy efficient and Energy Star Rinnai water heaters for residential potable water heating and light commercial applications. See the reviews of the popular Rinnai tankless models V53, V65, V75, R63, R75, R94, including condensing RU80, RU98 and boilers, using natural and propane gas. Fix the problems with the provided error codes.

History of Rinnai water heaters

Rinnai water heaters are distributed by Rinnai Corporation owned by Rinnai Japan. The business was founded in 1920s and in the early 1930s this Japanese manufacturing giant started producing gas appliances. Distribution started operating in North American in 1974 and in 2001 a new state-of-the-art distribution, research and training facility opened in Peachtree City, Georgia.

This article will give you the detailed review of the available models, its features and specs, also:

Review of advantages and features

rinnai water heaters tankless

Rinnai water heaters that are distributed and serviced in US and Canada are wall-hung, tankless all powered by natural gas or propane.

The quality of Rinnai gas heaters and boilers is already confirmed by its users and in the "Most Popular Products", a builder's magazine, where Rinnai water heaters have been voted #1 of all HVAC manufacturers.

Advantages and benefits

High efficiency

Major benefits when using Rinnai tankless water heaters are reliability, almost instant and endless hot water supply, with up to 40% energy savings, and high energy efficiency that ranges from 82% to over 90% for condensing models, RU80 and RU98.

Water flow

Hot water is delivered to the fixture fast, at the consistent and accurate temperature, with very small fluctuation in the water temperature. Some models have the Circ-Logic recirculation program that cycles an external pump for better comfort and higher efficiency.


With direct vent sealed combustion and flexible installation options you can install the Rinnai water heater almost on any inside or outside wall. For this operation you have to have an original Rinnai vent kits.

Environment friendly design

Superior advantages are making Rinnai tankless water heaters a world leader in the heating systems: they are "green" as they are reducing energy and water consumption, NOx and CO2 emission and with such a long life of 20 years reducing waste on landfills.

Actual performance life of gas burners and other heater elements greatly depends on proper installation, quality, usage rates, environmental conditions and maintenance.

Be aware that Rinnai water heaters cannot be used in mobile homes, modular homes, houseboats, or RVs.

Where to buy Rinnai tankless water heaters

Rinnai prices: tankless water heaters price range is from $900 to $1400 depending on the model. For the accurate and up-to-date prices, we suggest you to check licensed online / offline stores or directly Rinnai company. Buy here, from Amazon.com.

The installation and service of all Rinnai water heaters has to be done by a qualified and certified installer only, otherwise you can experience frequent problems and spend lots of time on troubleshooting and repairs. You can also buy it with confidence from the chain stores like Home Depot or Lowe's, as their installers are qualified to work on Rinnai water heaters.

emergency plumber

Pros and Cons


  • Never run out of hot water.

  • All Rinnai models are used for the whole house residential and commercial heating and some for space heating.

  • Condensing models with the ultra efficiency available.
  • Consistent supply of hot water.

  • 12-year limited warranty on the heat exchanger, for residential use.

  • 5-year warranty on Rinnai replacement parts.

  • There is no pilot light, ignition is electronic and automatic.

  • The noise level is low.

  • Unnoticeable cold water sandwiches due to the modulating gas burner and capability to work with the external recirculating pump.

  • Takes little space, it saves wall and floor space.

  • Every indoor model has the digital temperature controller built-in, while the controller is supplied with the outdoor model.

  • Simplified problem diagnostics through displayed error codes.


  • For some consumers it takes several minutes to have hot water running. (We say: it depends how far your point-of-use is), for others no real increase in time to get hot water, when comparing to tank type heaters.

  • LC code can be seen often, due to calcium issue and hard water. (Recommendation is to buy a water treatment system or flush the unit periodically).

  • Expensive.

  • Hard to install or you can use certified installer which is an additional cost.

Conclusion: Based on hundreds reviews of Rinnai tankless water heaters we have seen, there are many happy customers with positive feedback. When comparing Rinnai vs. Rheem, Noritz, Takagi or Bosch, you will see its quality, if not superiority. Or you can check Noritz vs.Takagi vs. Rinnai comparison table.

There are also complaints which are related to cold water sandwiches, long wait time for hot water, lime build-up, inconsistent hot water temperature... and many times Rinnai is blamed for all these problems.

But, is it?

Based on many positive consumer reports, this is the key; appropriate plumbing and gas fittings and proper installation.

The first thing you have to do when buying Rinnai water heater is to learn a bit about the product; does your plumbing and gas supply meet standards, the size, location... and double check information obtained from the heater dealer or plumber.

Majority of the problems described above are due to the improper installation and maintenance (even by your plumber), hard water, bad plumbing, lack of pressure, freeze damage... and they are root of the problem, not Rinnai.

Suggestion is: search, compare, select and read the warranty.


  • Rinnai water heater from V53 (old R50LS) series is the outdoor model that provides an instant hot water for two or three bathroom homes.

  • V65 series heaters are designed with the maximum power of 150,000 Btu which makes them ideal for homes with two to three baths.
  • Rinnai V75 and RL75 (old R75LS) - provides enough hot water for two to three-bathrooms with 7.5 gallons of hot water per minute. Indoor models can be installed in virtually any room as they vent directly to the outside. Outdoor models are installed outside, they free up interior space and save on installation and construction costs.

  • Rinnai RL94 (old R94LS)- with the capacity of 9.4 gallons of hot water and gas input of 199,000 Btu are ideal for homes with up to four bathrooms. With the two models available; they provide lots of flexibility during the installation.

  • Rinnai RU80 heaters are the smallest condensing units that also have the highest energy efficiency of 0.96. These models provide enough hot water to homes with three to four showers.
  • Rinnai RU98 water heaters are the largest units of all Rinnai and with the condensing technology they are able to provide high energy factor of0.95. Both indoor and outdoor models easily supply four baths with hot water, simultaneously.
Buy from Amazon.com

Tip: If you have bought or planning to buy Rinnai tankless water heater, use certified installers as you want to be sure to have a quality care, proper fitting, correct installation and valid warranty.

Rinnai is present in many countries; Australia, Japan, US, Canada, Taiwan, Italy, UK..., so if searching for Rinnai tankless water heaters to buy and trying to find a local certified installer, contact either directly Rinnai or your local distributer.

Manuals, specs and more

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User Reviews and Questions

Click below to see what other users have said...

Don't buy Rinnai 
My Rinnai sucks,Unit had to be placed far from the kitchen and bathroom due to severe limitations for venting etc. Now it takes forever to get hot water. …

Rinnai tankless - Make sure your switches are set correctly (Code 10) 
I have had a Rinnai tankless waterheater for 3 years in a vacation home (yes I said 3 years) and after 3 years of random code 10 errors and cold showers,innumerable …

Rinnai tankless - Code 11... solved Not rated yet
I have had a Rinnai R75LS tankless water heater for 9 years. I have not had a single problem with it. Yesterday it read a code 11, went to online manual …

Rinnai 94ls after 6 years Not rated yet
We had the rinnai 94ls tankless water heater installed 6 years ago we had it professionally installed. We replaced a 40 gallon electric water heater. I …

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(Photo credit to Rinnai)