Rinnai Tankless Water Heater Reviews in 2021: Complete Reviews

There are numerous types of water heaters out there on the market now, and on top of that, you also have to choose from various manufacturers. That’s why we’ve taken it upon ourselves to help sort that dilemma for you a little bit. This article of Rinnai tankless water heater reviews will simplify the choices for you, as we provide you our top 6 choices when it comes to Rinnai’s tankless water heaters. You’ll also be given the knowledge of how to make the perfect choice when it comes to tankless water heaters.

In a Hurry? Here's Our Top Choice:

Rinnai RUR98iN, Natural Gas Tankless Water Heater

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The top choice for us would definitely have to be the Rinnai RUR98iN. This unit boasts a 9.8 gallons per minute flow rate, and uses a natural gas heating element, making it efficient. Straying from the norm, it is compatible with a 1/2 inch gas line, making it easier to install. Furthermore, the dual heat exchanger method allows for this water heater to be much more efficient. Thus, you’ll feel this meeting your hot water demands with ease.




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  • Weight: 73 Pounds

  • GPM: 9.8 GPM

  • Type: Natural Gas Water Heater

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  • Weight: 82 Pounds

  • GPM: 9.8 GPM

  • Type: Natural Gas Water Heater

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  • Weight: 45.6 Pounds

  • GPM: 6.5 GPM

  • Type: Natural Gas Water Heater

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  • Weight:73 Pounds

  • GPM: 9.8 GPM

  • Type: Condensing Propane Water Heater

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  • Weight: 50 Pounds

  • GPM: 7.5 GPM

  • Type: Natural Gas Water Heater

Now that you know our best 5 products when it comes to Reliance water heaters, let’s take a look into why we have them on this list, and why they would be a great addition if you decided to get one!

Top 5 Rinnai Tankless Water Heater Reviews

Rinnai RUR98iN, Natural Gas Tankless Water Heater

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Apart from its monetary value, this water heater comes with a recirculation feature, using the 360 Thermacirc recirculation pump. This built in feature ensures that your water heater will always be able to provide hot water immediately, as the water is stored near the appliance that has to use it. 

As for its flow rate, the Rinnai RUR98iN boasts a very impressive 9.8 GPM, which stays steadily around 7-8 GPM in colder regions. This ensures that you can always maintain a good rate of hot water flow regardless of where you are.

You’ll even find that this tankless water heater saves your electricity bill, as it gives you a 96% energy efficiency. Not only that, but it is a condensing tankless water heater, which is 10% more efficient than non-condensing tankless water heaters. If you’re looking for some other condensing tankless water heaters, then you can definitely look through an article for the best condensing tankless water heaters out there.

The Rinnai RUR98iN will provide you with versatility and optimized settings as a hot water heater, and will last you for a long time, as it comes with a 12 year warranty, making it the best choice for us. The downside with this model is the fact that it costs higher compared to other units, making it a hefty initial investment.

  • Has multiple venting options for easier installation
  • Has a recirculation feature enabling hot water at all times
  • 96% energy efficiency
  • 12 year warranty with good durability
  • High GPM in both warm and cold climates
  • Can be switched between natural gas or propane models
  • High cost

Rinnai RUC98in, Natural Gas Tankless Water Heater

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Our second Rinnai tankless water heater is the Rinnai RUC98in and it also comes with a flow rate of 9.8 GPM. It also includes a very sleek and aesthetic build. However, it isn’t just for the looks, as this build provides the unit with great durability and allows it to last you for a long time.

Another great feature that this unit boasts, is its ability for multiple venting options. You can choose between concentric PVC and twin pipe venting options to find the one that offers you the most versatility and ease when it comes to installation. You’ll also be treated to the silent operation that this water heater has, which can be hard to come by.

The Rinnai RUC98in comes in as a great unit for environmentally conscious people, as it is equipped with low NOx emission capabilities, and a maximum energy factor rating of 0.92. Not to mention, it also has high efficiency, with its capability of 96% savings on energy.

As far as Rinnai water heaters go, this also comes with a very high flow rate of 9.8 gallons per minute, and can maintain itself in colder areas as well. The inclusion of the dual heat exchanger method also allows for it to maintain an optimized heat transference mechanism, making it quite ideal for any household. 

The Rinnai RUC98in ultra series is a very small and compact unit, which is very convenient for any household. It also includes a digital display system for your temperature, with the ability for adjustments to be made, making it one of the best choices out there. One downside to this however, is the fact that when applied to multiple points of use, you may notice a drop in pressure.

  • High flow rate of 9.8 GPM
  • Low NOx and Carbon Dioxide emissions
  • Can use both concentric PVC and twin pipe venting
  • Is a small and compact model
  • Includes a digital display with adjustment ability
  • Pressure might drop when multiple points are used

Rinnai V65IN, Natural Gas Tankless Water Heater

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Next up in our list of best Rinnai tankless water heaters, we have the Rinnai V65IN, and this is another gas powered water heater. The Rinnai V65EP, is the other version for this model when converted to propane. This water heater comes with a 6.5 GPM flow rate, making it quite suitable to be used in a family home. What’s even better is that this unit is built in with the Thermacirc360 recirculation pump, allowing you to attain hot water immediately whenever you need it.

Not only do you save water by turning on the water heater only when you need it, but this unit also comes built with low NOx emissions, and an uniform energy factor rating of 0.81. To prove its validity, you’ll find that it has an Energy Star certification too!

What sets the Rinnai V65IN apart is its enhanced technology inside the mechanism. It comes with Wi-Fi connectivity, allowing for you to be able to remotely adjust the settings on the water heater, alongside monitoring it as well.

Compared to most of the other tankless water heaters we’ll be looking at here, you’ll notice that the Rinnai V65IN is one of the lighter options, coming in at 45.6 pounds. This tankless water heater is also very easy to install, making your job for indoor installation quite easier. Another benefit is that this unit is compatible to a 1/2 inch gas line, allowing for more versatility. 

Overall, the Rinnai V65IN is definitely one to look out for, with its versatility and convenience. Not to mention, you can choose to set the water temperatures ranging from 120 to 145 degrees Fahrenheit, which can be done with convenience for this V series model. This unit poses a couple of downsides, one being its comparatively steep price. The other issue is that it also sometimes faces pressure drops in the water flow rate.

  • Has the recirculation or circ logic system for instantaneous hot water
  • Energy star certification
  • Wi-Fi allows for remote monitoring
  • Compatible with 1/2 inch gas line as well
  • Lightweight at 45.6 pounds
  • Easy to install in any place
  • Is a little expensive
  • Pressure might sometimes drop

Rinnai RUR98iP, Propane Tankless Water Heater

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The Rinnai RUR98iP is the next in our list of Rinnai water heater reviews. This is another heavy duty energy efficient water heater, with a flow rate of 9.8 GPM. Not only does it have a high flow rate in warm climates, but this unit can achieve around 6-8 GPM in the colder climates as well, with the use of the high quality heat exchanger in the build.

A very innovative technology that has been implemented in this unit and a few others that you’ll see in our Rinnai hot water heater reviews, is the recirculation or circ logic technology. This ensures that you will always have an endless supply of hot water in your home. This unit takes it one further and can do this even without a dedicated recirculation line in your home.

While the Rinnai RUR98iP may not be the smallest unit in our list, it still has multiple venting options available, and this makes installation very easy. You’ll be able to choose from Concentric and PVC, to offer you versatility when you are trying to install your water heater.

Rinnai have also made it quite convenient to use their tankless water heaters as well. The inclusion of Wi-Fi with digital adjustments and monitoring, makes these units much more convenient. It also comes with an energy rating of 0.96, and includes dual heat exchangers in order to help make this very energy efficient

The Rinnai RUR98iP model is definitely one that should be on your radar, as it will be more than enough for most residential and commercial spaces. However, the downside of Rinnai tankless water heaters being very steeply priced remains with this model as well. It also comes in as quite a large and heavy water heater.

  • Has 9.8 GPM flow rate, and maintain 6-8 GPM in cold climates
  • Recirculation technology helps provide endless hot water
  • Has multiple venting options available
  • Comes with Energy Star certification
  • Steep price
  • Heavy and large water heater

Rinnai RL75iN, Natural Gas Tankless Water Heater

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The last product in our list of Rinnai reviews for tankless water heaters, is the Rinnai RL75iN tankless water heater. As opposed to the others, this one requires outdoor installation, for the optimal usage. It comes with a limited warranty for up to 5 years, and will display the exceptional performance that you expect from a Rinnai tankless water heater.

The Rinnai RL75iN unit is also quite easy to install, as it can be mounted anywhere, and vented out of your home with just a single exit point. You’ll also notice this unit to be quite convenient due to its small and compact size, making it no hassle to have around your home.

Let’s not forget the digital temperature display you’ll find on this tankless water heater unit, making it easy to control and adjust. The interactive display will allow for easy usage and maintenance of the water temperature you want running through your home.

It becomes easier to use this unit with the Wi-Fi connection, and also its efficiency when it comes to energy usage. This non-condensing unit is 84% energy efficient. The remote control for this unit also allows for you to set the time in between each recirculation. And of course, that means the recirculation is present in this model, making it a lot more attractive.

Overall, you can definitely rely on the 7.5 gallons per minute flow rate that this unit has, especially in warmer climates. However, with the increasing flow rate of hot water, its efficiency falls. That’s where its downside lies. You can easily maintain a 7.5 GPM around 30-35 degrees rise, but the higher it gets, the lower the GPM gets. A 50 degree fahrenheit rise depletes its GPM to around 6.

  • Has easy outdoor installation with single ventilation
  • 84% energy efficiency
  • Can be mounted to any wall in your home with its small and compact size
  • Has a 7.5 GPM flow rate in warmer climates
  • Time for recirculation can be set
  • Becomes quite inefficient in colder climates with a lowered GPM, and is quite unsuitable in those places

Why Choose Rinnai Tankless Water Heaters?

Rinnai are a global brand, and have been well-known for providing some of the best products from their establishment in 1920. With growing innovation, they’ve managed to make better products year in and year out.

However, it is easy to say it, but what exactly are these reasons? Let’s look into it, so that you can be confident with your choice in RInnai tankless water heaters, and our reviews!

Optimal Efficiency in Performance

With the introduction of newer technology in the market for every sector, Rinnai have done a great job in making sure their tankless water heaters are being innovated as well. This includes the introduction of low NOx emissions, and low Carbon Dioxide emissions. With 81% efficiency being the lowest efficiency in their models, you can be sure to have a tankless water heater with super high efficiency, when you acquire a tankless water heater from Rinnai.


When it comes to a tankless water heater, they are meant to last you for a long time, and people often start their search with, “what is the best tankless water heater?”. While there isn’t a straight answer to this question, we can definitely state that Rinnai tankless water heaters are definitely up there. Them lasting for a 100 years on the market, proves that they know what they are doing, and that people trust them.

Easily Replaceable Parts

Your tankless water heater may have a great build, but if one part is weak, it can destroy the integrity of the entire water heater. Thus, you need to make sure that the entire build is up to scratch. A Rinnai tankless water heater reduces that headache for you by the availability of replaceable parts. Most times, when a tankless water heater has a broken or unusable part, you’ll have to get a new one entirely. However, with Rinnai, you’ll find that replacing that one part is easy to do and also comes at a low cost.

Space Saving Units

We’ve mentioned that every Rinnai tankless water heater has super high efficiency, and allows you to get hot water throughout your home. However, it’s also noteworthy to know that most models are built to look pleasing in your home, and most importantly, save space. They can be mounted on your walls, and come as lightweight water heaters.

Recirculating Technology for Instant Hot Water

This is a very key aspect of Rinnai tankless water heaters, as not all of them have this, but Rinnai try to incorporate this feature into most of their models. Any product that has this feature, is sure to provide you with super high efficiency, due to its ability to provide you hot water instantaneously, without wasting energy.

This feature doesn’t require a dedicated recirculation line to already be placed in your home, and can be used with any existing household plumbing. The dedicated recirculation line that these Rinnai water heaters possess, you’ll be able to send hot water immediately to any appliance or room, with the help of the pump to push the water there, without any delay.

Cons of A Rinnai Tankless Water Heater?

With so many positive sides to getting a Rinnai tankless water heater, there must be at least one issue with getting one right? Why shouldn’t you get a Rinnai tankless water heater?

The one issue that comes with Rinnai and their water heaters, is that they can be very expensive. With their complex builds, you’ll find that the units themselves are expensive. Not to mention, they also have complex installation processes, making you require a professional for your water heater to be installed. These water heaters may reduce the long term price with their high efficiency, but initially, you’ll find them to be quite expensive


Q. How long should a Rinnai Tankless Water Heater last?

Rinnai water heaters are built to last for around 20 years. They also come with warranties on them, making sure you can get any problems fixed with minimal cost.

Q. Are Rinnai Tankless Water Heaters good?

Rinnai is one of the best companies out there, and you can find some of the best tankless water heaters out there with ease. They’ve been around for a long time, and provide great innovation in their products for the best use.

Q. What temperature should a Rinnai Tankless Water Heater be set to?

Your Rinnai tankless water heater should be set to around 120 degrees fahrenheit. This is mainly to keep you safe from extremely hot water. However, this can be increased if you follow the safety steps on the manual.

Q. What Does Priority Mean on a Rinnai Tankless Water Heater?

The ‘Priority’ button on your Rinnai tankless water heater will allow you to know if your tankless water heater is ready to supply hot water, and that the remote controller is controlling the heater settings. You’ll know this when the light goes green, after you press it.

Q. How do I find my Rinnai error code?

To find the most recent error codes on your Rinnai, you’ll need to hold down the power button for 2 seconds, and the press the ‘Up’ arrow.

The Takeaway

Hopefully, you’ve managed to come to a decision on the perfect tankless heater for your home, from our list of Rinnai tankless water heater reviews. It’s essential to make sure you buy one that is perfectly fitted for the requirements for your home. High efficiency is a customary requirement with Rinnai tankless water heaters and the quality of heat exchanger they have in every model, so you’ll be fine there! The bottom line is that you’ll need a model of water heater that can properly fulfill your hot water needs. We’ve mentioned our top choice, but you can select from the V-series or one from the condensing units as well.

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