Rinnai Brand Water Heater Reviews

Gary Johnson
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Rinnai is a very popular brand of water heaters, with over 500 models currently on the market. The Rinnai brand makes high-quality components and good water heaters, but also poor models that break down fairly easily, which has given it a bad reputation in the long run.

Here’s a selection of what I consider to be the best Rinnai water heaters.

NameCategoryProduct
Rinnai RUC80iN Ultra Series Natural Gas Tankless Water HeaterBest OverallRinnai RUC80iN Ultra Series Natural Gas Tankless Water Heater
Rinnai V65IN Tankless Water HeaterBudget PickRinnai V65IN Tankless Water Heater
Rinnai RUR98iP 9.8 Max GPM Ultra Series Condensing Indoor Propane Tankless Water HeaterUpgrade PickRinnai RUR98iP 9.8 Max GPM Ultra Series Condensing Indoor Propane Tankless Water Heater

1. Rinnai RUC80iN Ultra Series Natural Gas Tankless Water Heater

Our rating: 9 / 10

Rinnai RUC80iN Ultra Series Natural Gas Tankless Water Heater

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Pros:

  • DOE-certified efficiency
  • Simple installations
  • Up to 90% more energy-efficient than a traditional tank heater
  • Easy-to-use digital controls
  • Advanced features such as ColdShower Technology and TurboBoost
  • Compatible with solar water heaters
  • May work with other tank-type heaters, particularly if they are set on maximum heat

Cons:

  • A bit heavy
  • A little noisy

The first product we’re going to look at is the Rinnai RUC80iN Ultra Series Natural Gas Tankless Water Heater. It is an Energy Star qualified, highly efficient tankless gas water heater provided by Rinnai.

This heater’s tankless design has a lifetime rating of 50 years. Meaning, it’s expected to last through 50 years of continuous use. If we look at the EPA’s Energy Star ratings, this product received a score of 80 out of 100. This means that it is approved by the EPA to be more energy efficient than 80% of all other products in its category.

2. Rinnai V65eN Tankless Hot Water Heater

Our rating: 9 / 10

Rinnai V65eN Tankless Hot Water Heater

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Pros:

  • Allows for great flexibility
  • Easy to install
  • Affordable

Cons:

  • May experience some cold water release
  • Heat loss

The Rinnai V65eN tankless hot water heater is our top pick thanks to its key features and unbeatable value price. Despite being low cost, the unit comes with several safety features that automatically protect the product from any misuse.

The Rinnai V65eN heater is easy to install thanks to the fact that it comes with a quick connect 21⁄4 in. gas and compression fitting. This feature is especially practical if you install it for one of your kitchen or bathroom faucets. Best of all, it only takes half an hour to get the heater up and running.

As far as cost efficiency goes, this heater is among the best with energy saving mode while conserving up to 50% of water and energy—you can even remotely control the temperature from 90 degrees to 130 degrees Fahrenheit. It also prevents the water from being heated more than two minutes after it is not used.

3. Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless Water Heater

Our rating: 9 / 10

Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless Water Heater

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Pros:

  • Twin pipes provide 99.9% efficiency
  • Remote control for easy temperature and water flow adjustment
  • Continuous, instant hot water
  • Uses natural gas
  • Less heat loss
  • Can be used outdoors

Cons:

  • Lower flow rate
  • Costs more than the standard units

Rinnai RUC98iN is a powerful tankless water heater, making it suitable for residential and commercial purposes. If you’re building a new house or looking to replace your current water heater, this device is worth considering.

The twin gas-fired heaters have an output of more than 4,000 and more than 6,000 output BTU respectively. Considering that the average consumption of gas for a family per day is about 36,000 BTU, this heater would be able to meet the entire demand of the family.

The remote control is a satisfying addition. It gives users the freedom to change the water temperature and flow rate according to various requirements.

4. Rinnai V65IN Tankless Water Heater

Our rating: 8 / 10

Rinnai V65IN Tankless Water Heater

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Pros:

  • Great warranty
  • Simple installation
  • Energy efficient
  • (Relatively) inexpensive

Cons:

  • Only compatible with natural gas (In the USA
  • Cannot be used with caustic substances, including salt.)

120V, 12LPM.

Although the Rinnai V65iN is the highest model in this series, I believe it’s the most reasonably priced high quality water heater on the market from a well-known manufacturer. Most tankless water heaters cost more than this.

The Rinnai is well made and built to last. It’s a great mid-range product in terms of both price and energy efficiency. Since you don’t have gas storage, the Rinnai will save you money on monthly bills compared to other water heaters of the same quality.

5. Rinnai V65IP Tankless Water Heater

Our rating: 8 / 10

Rinnai V65IP Tankless Water Heater

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Pros:

  • Excellent efficiency
  • Reliable
  • Gets rid of annoying water storage tanks

The Rinnai V65IP is a sleek, energy-efficient tankless water heater for indoor use. It’s ideal for homes with a large number of bathrooms since it can heat as much as 104 liters per minute. Perhaps the best part is that you no longer have to fill water tanks and wait for cold water to heat up again. This one comes already hot.

It’s also a super eco-friendly product, which uses up to 80% less energy than conventional water heaters. It comes equipped with an autosense infrared burner that detects water flow rates. This means it will always deliver the right amount of heat (12,000 – 19,500 BTUs) regardless of the water temperature entering the unit and the flow rate.

This tankless water heater doesn’t require much maintenance either, which is great for people who have trouble making it to their water heater service appointments on time. So What About Batteries?

6. Rinnai RL Series HE+ Tankless Hot Water Heater: Indoor Installation

Our rating: 8 / 10

Rinnai RL Series HE+ Tankless Hot Water Heater: Indoor Installation

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Pros:

  • Compact
  • Long lasting

Cons:

  • Prone to leaks
  • Pricey compared to other water heating systems

The Rinnai Series HE+ tankless water heater is easily installed and doesn’t require plumber’s help. This unit features three temperature settings, fast recovery, and an instantaneous activation process. These features give you a programmable heater for both electric and gas water heaters.

Still on the topic of features, the Rinnai RL-series HE+ series water heater also includes a self-clean mode to get rid of mineral deposits that can affect the lifespan, efficiency, and output of your heater.

In addition, the unit features a valve for draining of condensed water, a copper heat exchange to help prevent corrosion, and an internal pressure gauge that allows you to check the pressure levels of your heater.

7. Rinnai V65EP Tankless Water Heater

Our rating: 8 / 10

Rinnai V65EP Tankless Water Heater

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Pros:

  • Very energy efficient
  • Excellent quality
  • Quiet
  • Easy to set up
  • No storage tank needed

Cons:

  • Pricey
  • Poor internal layout

If running off of the grid, you’re going to need to keep those hot showers going thanks to the Rinnai V65EP, our top pick for the best tankless water heaters. This tankless water heater runs off propane or natural gas, has an energy efficiency of up to 98% (which translates into much cheaper bills), and offers an impressive 6.5 GPM, which is more than enough for your needs.

Rinnai has exceptionally high standards when it comes to the quality of its products, and the V65EP is no different. This high-powered tankless water heater is incredibly energy efficient, easy to operate, and has a life expectancy of at least 10 years – all while working quietly. This unit is also codes as hybrid ready so you can add supplemental electric heating to save even more money on your home heating bill.

8. Rinnai RL Series HE+ Tankless Hot Water Heater

Our rating: 8 / 10

Rinnai RL Series HE+ Tankless Hot Water Heater

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Pros:

  • Up to 98% energy efficiency
  • Incredibly simple to install
  • Installs vertically in the space of a horizontal tank
  • Not prone to sediment build-up
  • Comes with a lifetime warranty
  • Compatible with all standard 1/2" plumbing connections
  • Large temperature rise is ideal for showers and instantaneous hot water needs
  • Can handle multiple high-demand fixtures, such as dishwashers and washing machines
  • Handles up to 5 showerheads at once without any reduction in performance
  • Integral heater/circulator improves comfort

Cons:

  • Stainless steel finish is more prone to scratches than other models
  • Available in indoor-only and outdoor versions
  • Must be paired with a compatible Rinnai water heater to use
  • CSA certification number is difficult to find on the product
  • For the price, it’s still a little underpowered

9. Rinnai RUR98eN 9.8 Max GPM Ultra Series Condensing Outdoor Natural Gas Tankless Water Heater

Our rating: 8 / 10

Rinnai RUR98eN 9.8 Max GPM Ultra Series Condensing Outdoor Natural Gas Tankless Water Heater

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Pros:

  • Suitable for on-demand type of systems
  • Simple design and easy installation process
  • Low gas consumption and relatively quiet
  • Sturdy and well built body

Rinnai is a Japanese manufacturer, renowned for producing innovative products and providing world-class customer service. However, you may wonder why we’ve featured this brand and product in the finance section.

I have a very close friend who bought this particular product and went on raving about its phenomenal heat output and low gas consumption. Not only that, he had it installed in his house within a week by an Rinnai approved technician. He claims this is his best ever buy – so it seems to be a very good investment bet.

One of the great features of this water heater is that it has a relatively low gas consumption, yet it instantly heats up water. So far, his experience with this heater has been very positive as you can see from the image below.

10. Rinnai RUR98iN Ultra Series Condensing Indoor Natural Gas Tankless Water Heater

Our rating: 8 / 10

Rinnai RUR98iN Ultra Series Condensing Indoor Natural Gas Tankless Water Heater

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GPM, 1.5 Ch

11. Rinnai RLX94iN HE + Tankless Water Heater

Our rating: 7 / 10

Rinnai RLX94iN HE + Tankless Water Heater

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Pros:

  • Can be installed indoors and outdoors
  • Powerful energy saving features
  • Storage and tank water heaters available
  • Easy to set up and hook up
  • Eco-friendly

Cons:

  • More expensive than some other high-end models
  • Can be noisy at times

It contains up to 99% less CO2 emissions when compared to traditional models, and maintenance is minimal, thanks to a durable, condensing radiant heating technology. It has four available settings: Economy, High, Low, and military time.

Plus, its energy savings can be further enhanced with a dedicated timer and insulating blanket, and the device includes a corrosion-resistant protection system, a fiberglass-reinforced thermal wrap, and a stainless-steel burner.

It also has an optional Outdoor Kit that enables outdoor installation, and it comes with a built-in cold water tank, allowing for greater savings.

12. Rinnai RUR98iP 9.8 Max GPM Ultra Series Condensing Indoor Propane Tankless Water Heater

Our rating: 7 / 10

Rinnai RUR98iP 9.8 Max GPM Ultra Series Condensing Indoor Propane Tankless Water Heater

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Pros:

  • Awesome modern design
  • Rinnai’s patented douse-and-use technology
  • Extremely durable
  • Superior customer care
  • Very energy efficient
  • 3-Year Warranty

Cons:

  • Requires professional installation
  • Very pricey

The Rinnai water heaters have been outstanding, and the Rinnai RUR98iP 9.8 Max GPM is no different. This fantastic water heater works great for any application – from single-family homes to restaurants with a large turn-around demand.

This is certainly the best tankless water heater because of the unique douse-and-use technology. You don’t have to wait for the water to heat up before you use it. Once this water heater has reached its optimal temperature, the gas will automatically be doused. This means you don’t have to worry about wasting energy or gas, and you can put more water through the heater with less energy and gas consumption.

Another great feature of this water heater is the installation. If you’re handy and have plenty of experience with gas and water heaters in your home, it’s best to purchase the water heater with a burner stand, tank and supply hoses, regulator, and spark igniter.

13. Rinnai RUCS Series SE Tankless Hot Water Heater: Indoor Installation

Our rating: 6 / 10

Rinnai RUCS Series SE Tankless Hot Water Heater: Indoor Installation

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Pros:

  • 40 GPM
  • Longest warranty on the market at 10 years
  • 100% natural gas powered. Reasonably priced.

Cons:

  • Can be difficult to install.

This is our top pick for the best tankless water heater because of its strong performance at a fair price. It offers several safety options like a built-in thermostat and a freeze protection system. It’s also engineered for use in indoor installations.

This Rinnai tankless water heater is a tried and true model that performs well and has the longest warranty on the market at 10 years. It also costs less than other models with the same capabilities.

When looking for outdoor models, you’ll have to consider whether your climate needs indoor or outdoor installation. The Rinnai RUCS Series SE Tankless Hot Water Heater is an indoor model that’s ideal for use in basements, garages, and sheds. However, if you’re looking for an outdoor tankless water heater instead, we’ve got you covered with our Top Pick Outdoor Choice below.

14. Rinnai RUCS Series SE Tankless Hot Water Heater: Indoor Installation

Our rating: 6 / 10

Rinnai RUCS Series SE Tankless Hot Water Heater: Indoor Installation

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Pros:

  • 40 GPM
  • Longest warranty on the market at 10 years
  • 100% natural gas powered. Reasonably priced.

Cons:

  • Can be difficult to install.

This is our top pick for the best tankless water heater because of its strong performance at a fair price. It offers several safety options like a built-in thermostat and a freeze protection system. It’s also engineered for use in indoor installations.

This Rinnai tankless water heater is a tried and true model that performs well and has the longest warranty on the market at 10 years. It also costs less than other models with the same capabilities.

When looking for outdoor models, you’ll have to consider whether your climate needs indoor or outdoor installation. The Rinnai RUCS Series SE Tankless Hot Water Heater is an indoor model that’s ideal for use in basements, garages, and sheds. However, if you’re looking for an outdoor tankless water heater instead, we’ve got you covered with our Top Pick Outdoor Choice below.

Frequently Asked Questions (FAQ)

Is Rinnai a good water heater?

This is a trick question. Rinnai is a fantastic brand of water heater. While there are many high quality brands on the market, Rinnai is one of the leading manufacturers of tankless water heaters. We can’t say enough good things about Rinnai’s products. The quality and technical support are unmatched. Rinnai’s tanks are built to last and they are backed by one of the top customer service groups on the market.

Compared to traditional tanks and tankless heaters, the Rinnai tankless water heater units are expensive, but you definitely get what you pay for. Their technology and features at this time make any Rinnai model worthy of consideration.

What brand of tankless water heater is the most reliable?

Most of the tankless water heaters available on the market today are made by one of the top three manufacturers: Rinnai, Takagi or Viessmann. Plumbers recommend these brands due to their reliability found through countless hours of testing and real-life application.

In fact, virtually every plumber or technician that has ever worked on one of these systems recommended it to their friends and family. Of course, our personal and professional recommendations come from 2 years of research, hundreds of hours of testing and the hands-on experience from two of our family members that are serving in the armed forces.

The number one tankless that we recommend comes from RINNAI. In fact, we have made wirelessly controlled hot water systems the number one important thing you can do to increase your home's resale value. And it is almost 100% because of the new tankless options that come from RINNAI.

How long will a Rinnai water heater last?

This is an easy question to answer if you live in an area with very cold winters and very hot summers. Also, if you install the unit in a garage so it is aging in a much more humid environment.

Typical warranties on Rinnai water heaters tend to be 10-15 years for most manufacturers. However, if you live in an area that is not ideal it might be a good idea to budget 20 years for the water heater.

What is the best Rinnai tankless water heater?

If you live in an area where you have access to natural gas, then we recommend the Rinnai RL75i. This model comes with an adjustable thermostat, which will give you more control over the temperature in your house. It also offers a rate of flow of 6 gallons per minute. If you live in an area where it is hard to get your hands on natural gas, or you want a more affordable option, then we would recommend the Rinnai RL75n. This tankless water heater is also quite efficient, but instead runs on propane as its fuel source.

Conclusion

We're so happy to have the opportunity to provide an all around review of the Rinnai tankless water heater. As it turns out, there are only a few of these types of water heaters on the market, but we feel this one is clearly a winner. It also comes in different sizes and models. So, if you need a high-quality water heater in a specific size and some of the specific features, you'll find that this product checks all of your boxes. So stay tuned to learn more about this product in full detail, and how it can help your home stay warm and dry.

Our Recommendation

NameCategoryProduct
Rinnai RUC80iN Ultra Series Natural Gas Tankless Water HeaterBest OverallRinnai RUC80iN Ultra Series Natural Gas Tankless Water Heater
Rinnai V65IN Tankless Water HeaterBudget PickRinnai V65IN Tankless Water Heater
Rinnai RUR98iP 9.8 Max GPM Ultra Series Condensing Indoor Propane Tankless Water HeaterUpgrade PickRinnai RUR98iP 9.8 Max GPM Ultra Series Condensing Indoor Propane Tankless Water Heater