Exact matches only
Search in title
Search in content
Search in excerpt
Search in comments
Filter by Custom Post Type
Back to Tankless Water Heater Comparison

Rinnai RL75iN review 2020

Last update:

Ready to save money and energy with a new Rinnai tankless water heater? Homeowners have been catching on to this trend in the past few years as energy savings and efficiency continue to push the limits. Many heating and cooling manufacturers on this list also recognize that homes are smarter and need digital access for more control.

>> Order safely & cheaply for $1 on Amazon!
6. Place
Tankless Water Heater
6.97 (good)
Current offer
from approx. $1

List price approx. $1
Show on Amazon now!
Overview of functions
  • Product Dimensions :

    14 x 9.3 x 23 inches

  • Item Weight :

    50 pounds

  • Size :


  • Color :


  • Style :


  • Water Consumption:

    9.4 gallons

  • Material :


  • Power Source :


  • Voltage:

    220 volts

  • Warranty:

    1825 days

  • reasonable price
  • durable and safe
  • easy to operate
  • nice design
  • perfect for large home


  • GPM decreases as water temperature climbs
Back to comparison: Tankless Water Heaters review 2020

You can find all of the top tankless options on this list as well as a review of different stores that offer the best water heating appliances.

The Rinnai Tankless Water Heater series offers a lot more than competitors in terms of quality and features. With a high-reliability score, Rinnai heaters simply prove that they are more energy efficient and smarter than the average household heater. This guide goes through what you can expect from the brand as well as a few of their top products to look out for if you’re in the market for a water heater.

History of Rinnai

Rinnai Tankless Water Heater HistoryOnce known as Rinnai America, the company is one of America’s best when it comes to heating and cooling appliances. Rinnai Tankless Water Heater has been in business for nearly 100 years. Since 1920, the company has created a name for itself in delivering heating and cooling appliances to North America. Founded by Hidejiro Naito and Kanekichi Hayashi, Rinnai Tankless Water Heater has always been focused on streamlined manufacturing and quality products. The company has offices in over 13 countries and believes that smart comfort is the best option. Tankless water heaters under the Rinnai Tankless Water Heater brand are some of the most highly rated appliances, simply because they save on energy, don’t break down, and have positive customer ratings.

The company is more than a manufacturer. In many cases, Rinnai sets the standard of what customers should expect for heating and cooling. In their history, the company has remained loyal to in-house designers and does not cheapen the product. It’s one of the reasons that customers call it the most dependable water heater.

Within the tankless water heater space, Rinnai has excelled, creating products that achieve the needs of their customers through innovation and smart features. With engineers constantly developing new products, the company has managed to stay on top of the market despite a number of new competitors transitioning to tankless water heater appliances.

Part of what makes Rinnai’s products so valuable is that time and research goes into each appliance. The company has over 600 research and development partners, most of whom are engineers. These teams focus on creating the top products with the most features, delivering uncompromising quality in function and design. In addition, Rinnai America is one of the only tankless water heater companies to have achieved the Canadian Standards Association for its testing laboratory.

All products are live tested to ensure that they work properly as well. All products in North America have also been approved by the American National Standards Institute. You will find that all water heaters from this brand come with a warranty. However, most customers report that Rinnai heaters are the best and can stand the test of time.

Types of Rinnai Tankless Water Heaters

Natural Gas or Propane

Rinnai has all types of water heaters, but they either fall into propane or natural gas categories. Gas types will use propane tanks to heat up water on-demand. However, electric water heaters will use electricity to warm up water as it flows through the unit. There are some advantages to using electric water heaters, specifically that you don’t have to rely on a resource that is a pollutant. The main difference is in placement and price. Natural gas is indoor options mostly and typically run between $800 and $1,300. In comparison, propane can be used outside and typically costs over $1,000.

Features of Rinnai Tankless Water Heaters

There are a variety of different water heaters under the Rinnai brand. From tankless water heaters to gas home heating and accessories, there are a few different products that have continuously ranked highly with customers. The company has developed water heaters for commercial and residential use as well as gas, electric, and hybrid options.

These water heaters deliver hot, endless water almost as soon as you turn the faucet on. However, you don’t need a tank to hold water in with these appliances. Here are a few of the features that stand out about this brand.

Endless, On-Demand Hot Water

Rinnai Tankless Water Heater FeaturesIn general, on-demand water heaters are made without tanks. This is so you can heat up water as soon as you turn the faucet on through propane or gas water heaters, rather than keep a continuously heated water tank. This saves money and water, which makes it a great investment for a homeowner who wants to cut down on energy use.

However, it’s also just great to have water that only gets heated when you need it. This action saves a ton of energy expenses. With these new water heaters, a propane or gas heating system is used to warm up water on-demand to the temperature that you set. It works with every faucet and shower in your home. Typically, water takes about the same time to heat up as with a water tank, but that’s not the same for every brand.

With Rinnai Tankless Water Heater, customers have rated the energy efficiency and quickness of heat very high. This means that you not only get to save on water and utilities every time you turn on the shower, but you also don’t have to wait very long. In comparison to other brands, you may have to wait for an electric water heater to get the water warm enough for a shower. It may never get as hot as a Rinnai shower however as it uses propane or natural gas.

Energy Star Efficiency

Rinnai Tankless Water HeaterAll of Rinnai’s water heaters are rated as Energy Star compliant. This is a proudly featured specification on all of their products. With newer water heaters, you have to be careful that they are rated efficiently, as some of the older equipment is not as energy-saving as the newer models. You can tell by the type of emblem that comes on the appliance whether it has been rated in the past few years. You can also see the logo on all of the products online through Rinnai’s website. This indicates that the water heaters have been rated within the past year.

Part of Rinnai’s quality control is to live test every water heater before it goes out for sale. You should expect that your heater is in prime working order and energy efficiency by the time it reaches your home. You can also see how many energy is saving with the energy factor rating on the appliance. Rinnai Tankless Water Heater typically has a below 0.93 energy factor rating.

Space Saving

The bulky water heater closet is always a waste of space. Without a tank, you have a lot more room for the water heater, and you can add shelves or simply place your vacuum and brooms inside of the closet for once. You can also install a water heater where it works best for space as the design is so flat in comparison to regular water heaters. Most of the new tankless options only need to hang on a sturdy wall that can support its weight.

In addition, there are also specifications that regulate whether a heater can be used indoors or outdoors. You get more options for placement with an outdoor unit. This could free up an entire closet or area of your home that used to have a water tank.

Better Property Value

One of the best things about investing in a tankless water heater is that it helps your property values in the future. When new buyers look for homes, according to Zillow, the investment is worth the cost, as you can typically add-on for the full price or more of the original unit. It also indicates that you have a newer or remodeled home with energy efficient appliances that are more sustainable. These newer heaters were also listed in Digital Trends as one of the four ways that you can increase your home’s resale value.

Water Flow Rate

Rinnai Heater water flow rateWhile all tankless water heater is rated to deliver a specific rise in temperature for a water flow rate. This means that a water heater should be able to heat up 2 to 5 gallons of a water per minute. There is a difference in some of the newer Rinnai models and the older ones. This is mainly due to recirculation heaters that can instantly deliver hot water.

If a Rinnai doesn’t have a recirculation feature, then you are probably going to wait up to 60 seconds for hot water. Rinnai Tankless Water Heater lists all of the flow rates on their models in the specifications. However, the company states that they are rated for 1 gallon per minute.

The time also depends on how far away the appliance or faucet is from the water tank. If your tankless heater is on the other side of the house from the shower, then you may wait up to 90 seconds or more for water to reach the faucet.


Rinnai heaters come with long-term warranties, ranging from one to five years. One heater can also have multiple warranties for different parts. You can also purchase extended warranties for certain products or parts, allowing you to ensure your appliance works for many years after purchase. However, most customer testimonials indicate that heaters work for more than 15 years without issue.

Recirculation and Circulation Pumps

With any tankless option, water heaters can easily get fast hot water to your faucet. Without a circulation pump though, it could take quite a bit longer. Rinnai Tankless Water Heater is made with integrated pump lines to ensure that you get hot water faster. These are dedicated return lines that are built into the heater. It works with any pipe configuration for any house, so you can easily set up the water heater so that you get the hottest water whenever you need.

WiFi Capabilities

There are some tankless water heating options that come with WiFi. This allows you to check the status of your water heater, turn it on, or start up a shower using Alexa. Control-R is a new product from Rinnai Tankless Water Heater. It allows you to take your home to the next level with smart water controls. You can control the water heater from a mobile phone or tablet. You can activate recirculation if you need, and it also provides alerts. For example, you can get automatic maintenance alerts. There are also features for diagnostics and instant hot water.


Overall, Rinnai Tankless Water Heater makes a high-quality tankless heater option that has everything you need for the modern home. With smart features, you can truly control everything about your shower or hot water needs, whether you want to connect through Alexa or your mobile phone. While there aren’t any electric options with Rinnai, propane and natural gas are considered to be better for faster water heating by the gallon.

Show Tankless Water Heater on Amazon now!

Comparison result

Price Value

6. Place

6.97 (good) Tankless Water Heater

Conclusion: Get Rinnai RL75iN Natural Gas tankless water heater, if you want to resolve your water heating issues for decades

1 Stern2 Sterne3 Sterne4 Sterne5 Sterne (1,361 Ratings. Average: 4.70 von 5)