Noritz vs Rinnai – Which Tankless Water Heater is Better?

Finding a tankless water heater that works for your situation can be a frustrating task, and no one wants to be purchasing one that doesn’t end up working for their specific purpose. It’s always good to do as much research as you can before purchasing a tankless water heater.

When it comes to tankless water heaters, two companies continually go toe-to-toe are Noritz Vs Rinnai. Both of these companies offer superb tankless water heater products and are similar in many ways, but it still pays to dig a little further deeper into what each company offers customers.


Rinnai is a popular manufacturer of tankless water heaters. It has many different products that work well for residential homes while still being compact at the same time. A lot of the tankless water heaters they offer are energy-star qualified. They also use some of the latest technology in the industry, such as WiFi controllable technology.

Because of these characteristics, Rinnai has made a name for itself by manufacturing the best-selling water heater throughout North America.

Hidejiro Naito and Kanekichi Hayashi founded Rinnai back in 1920. They initially started making cooking stoves over in Japan. As soon as the 1930s rolled around, they started manufacturing gas appliances. In 1964, they started gravitating towards manufacturing water heaters, and after a decade of doing that, they began an office in the United States.

Rinnai Water Heater

Tankless Water Heaters By Rinnai

The tankless water heaters that Rinnai manufactures are top-of-the-line products that give you hot water nearly as instantly as you turn on the tap. There isn’t much fluctuation in the temperature of the water, either. If you compare Rinnai tankless water heaters to similar products on the market, Rinnai has about a 40% savings advantage in terms of energy consumption.

Rinnai manufactures water heaters aimed toward heating the water in a mid-sized home. Because of that, you won’t find them manufacturing electric tankless water heaters. All of the tankless water heaters that Rinnai produces use propane or natural gas. Electric heaters will increase the energy costs too much to be able to support your home.

Gas water heaters are typically a little more expensive right off the hop because of the installation fees, but you’ll end up paying under half of what you’d be paying if you went with an electric tankless water heater for a mid-sized home.

What Location Are Rinnai Water Heaters Made In?

Rinnai tankless water heaters were all manufactured in Japan until around 2018 when a manufacturing plant opened in Georgia.

What Types Of Rinnai Water Heaters Are There?

Rinnai manufactures hybrid water heaters and tankless water heaters. With the hybrid ones, you’re getting a combination of a tank and tankless water heater. These hybrid designs include the best parts of the old technology and combine them with the best parts of the new technology.

If you want to get rid of an old water heater, getting a hybrid model is a perfect way to use the new technology.

What Do The Ratings Say?

Overall, Rinnai tankless water heaters receive very high ratings across many customers. Most customers rate Rinnai as being a highly reliable brand that produces tankless water heaters of great quality. A trend that many customers note is that the tankless water heaters that Rinnai provides can be used inside and outside, whereas competitor ones are usually one or the other.

When it comes to the ratings for propane and natural gas heaters, they are widely the same.

What Maintenance Is Required For Rinnai Water Heaters?

The general rule of thumb is to clean your tankless water heater at least once annually. Doing so will prevent any minerals from building up in the water heater, and most customers say that this is an easy process. You’ll want to check your water heater at least once a year for any blockages that might be occurring in it.

The water heaters that Rinnai manufactures alert customers if there is any needed maintenance. Customers will see an error code pop up on the front panel of the water heater, and this will help the customer or the HVAC technician to address the problem much easier.

How Are Rinnai Tankless Water Heaters Priced?

Because Rinnai produces some of the best water heaters on the market, its prices are higher than many other brands out there. It’s useful to note that Rinnai does have cheaper options for those who want something a little easier on the wallet.

Customers can expect to pay around $650 to over $2,000 for the best Rinnai water heater. With the water heaters that have higher GPM and other features, the price will reflect that.

Rinnai Water Heater Models

There are three categories of Rinnai water heaters:

  • High-efficiency
  • Super high-efficiency
  • Hybrid

There aren’t any mid-range models with Rinnai products, and the high-efficiency ones will start at a 0.79 energy efficiency factor. The hybrid models will be nearly 0.97.

Rinnai V75 – Cheapest Water Heater For Average Homes

The Rinnai V75 water heater is the cheapest model you can buy for a mid-size home. It comes with an energy factor of around 0.82 and is known to be a little more efficient than other water heaters around its level. The ignition is electronic, and it creates low pollution levels.

Water can reach around 140 degrees Fahrenheit with this model, and there is a built-in water temperature lock that will prevent any changes in temperature from occurring. You can use this heater can be used outdoors in temperatures of -22 degrees Fahrenheit. You can also control this heater using WiFi.

Rinnai RUC98 – Most Eco-Friendly

If you want the most eco-friendly water heater Rinnai offers, the RUC98 is the one. It’s perfect for those that are looking for an indoor heater due to its aesthetic appeal. It has a premium casing that will keep the water heater lasting well into the future.

The cost of the RUC98 is expensive, but the operating costs to keep it going are fairly low. Customers rarely ever have issues with this heater, and the only negative thing that some people note is that it is a little on the bulky side. Even though this water heater might look a little on the larger side, it doesn’t take up much room.

Rinnai RHS100 – Best Hybrid

The hybrid line of water heaters offered by Rinnai is pricey, but because of how much energy they will save you, they are worth the money. They have recirculation technology, are energy-star rated, and have voice functionality.

Inside water heater

Noritz Vs Rinnai

​Noritz is another Japanese manufacturer of tankless water heaters. It has been manufacturing these products for over six decades and manufactured its first tankless water heaters around 1981. Noritz also gravitated toward the United States and started operations there in 2002.

Noritz ensures to remain very active on a lot of social media platforms. They feature showrooms at all of their locations, and they make sure that customers know that they manufacture the most durable tankless water products.

Noritz has developed a solid reputation for producing gas tankless water heaters, and they come with a variety of useful characteristics.

Super Easy Installation

Even for homeowners that don’t have any experience with water heaters, they should still be able to remove their old tankless water heater and install the Noritz EZ Series line of water heaters with no issues.


The Noritz Connect app lets users control their water heater and set up maintenance notifications when it’s time to do so.

Low NOx

Noritz ensures to keep pollution at a minimum, and they have a bunch of low-ultra-low NOx water heaters that do just that.


Almost all of the tankless water heaters that Noritz manufactures are energy star certified, meaning that customers will have a lowered energy bill from month to month just by going with a Noritz water heater. Customers will also be able to make use of rebates offered through Noritz. By taking a visit over to their website, you’ll be able to find rebates on certain models.

Noritz Products

Many different Noritz products will work very well for indoor and outdoor purposes. The three different categories of products offered through Noritz are:

  • EZ Series
  • NR series
  • NRC series

Noritz EZ98/EZ111

These two models are similar, and the only main difference to note between them is the size. They come with a UEF rating of 0.96 and can produce 9.8 GPM. They also use stainless steel heat exchanges and offer a 25-year warranty. You can install each of these heaters either inside or outside.

There are many different heaters in the NR series of Noritz water heaters, and all of them are energy star certified, coming with a UEF rating of 0.81. You’ll be able to get a flow of 5 to 9.8 GPM with these water heaters, and you can install them both inside and outside.

NRC Series

There are also many different water heaters offered through the NRC series category. With heaters in this category, you’ll get a UEF rating of 0.94 and an output of 11.1 GPM.

What Is The Cost Of Noritz Tankless Water Heaters?

You can expect to be paying at least $550 for a Noritz Tankless water heater. On the upper end, you can expect to be paying $6,000. If you’re looking for a cheaper model, getting one in the NR series is advised. The models in the high-efficiency category will end up costing you more.

Models in the NRC category cost more because they come with more characteristics. The price of your water heater will also reflect its power and capacity. If you live in a huge home and require more BTUs and more flow, then you’ll be needing a water heater that will reflect that. The water heaters that provide more hot water will end up being more expensive.

Cost To Install

Tankless water heaters are more expensive to install than a water heater with a tank. You’ll most likely require a plumber to install your tankless water heater, and if you don’t, the warranty could potentially be voided.

All of the Noritz tankless water heaters on the market come with a warranty that will last you 12 years. The warranty on the parts in your water heater will be 5 years. For labor, you’ll be getting a 1-year warranty that will cover labor costs of up to $120.

Some exceptions to the 12-year warranty are:

  • Recirculation installations will be up to 12-years or 6500 hours of burn
  • The EZ111 and EZ98 come with a 25-year warranty package
  • Some models only have a 3-year warranty for the heat exchanger

What Maintenance Is Required for Noritz Water Heaters?

The better you keep your water heater maintained, the longer life that you will get out of it. If you perform maintenance regularly, you’ll be able to get over 20 years of use out of it with no problems.

To maintain your Noritz water heater, you’ll have to flush it regularly so that the limescale will get removed. Those that live in locations that have hard water will be dealing with this more persistently. If your water is hard, then the frequency of your flushing should reflect that.

Noritz provides instructions for all required maintenance in the manual that comes with your water heater.

What Are Some Common Issues?

The majority of the issues that come with Noritz tankless water heaters revolve around improper installations. If they aren’t installed properly, sometimes the electronic monitoring can be affected.

Another issue that people run into is a water heater that isn’t big enough for their home. People try to save money by getting a water heater that’s cheaper and too small for their purposes, and they end up paying later on.

If you’re looking into tankless water heaters, you might want to contact a plumber to see what their opinions are. When it comes time to purchase one, you’ll also want to get the plumber to install it so that you won’t run into further issues down the road.

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