Rinnai Tankless Water Heater Review: Is it Worth Your Money

Rinnai tankless water heater review

Are you looking for an efficient, cost-effective, and reliable way to heat your home’s water? Then this Rinnai tankless water heater review is for you!

The Rinnai tankless water heater is designed to provide an endless hot water supply and can be installed quickly and easily, with minimal disruption to your home. In this Rinnai tankless water heater review, we will look at the features of the Rinnai tankless water heater and see if it is worth the investment. 

I will take you to the water heater’s cost, installation, and performance, as well as how it compares to other models on the market. By the end of this Rinnai tankless water heater review, you will have enough information to decide whether the Rinnai tankless water heater is the right choice for your needs.

FAQs on Rinnai Tankless Water Heater Review

What type of maintenance is required for a tankless water heater?

It’s critical to frequently clean or replace the water filter, clean the air filter (for gas systems), descale the system, and flush it to extend the performance and lifespan of your tankless water heater.

Does the Rinnai tankless water heater have a filter?

Yes, the Rinnai tankless water heater has a filter. The air filter will pull out toward you from the upper right corner of your appliance. A screen keeps insects and other debris out of your Rinnai tankless water heater since it has a fresh air intake. 

What is Rinnai’s required minimum flow rate?

To operate and maintain performance, Rinnai tankless gas water heaters require a flow of water through the heating element of at least 0.4 to 0.6 gallons per minute.

Rinnai Tankless Water Heater Review

Rinnai is a Japanese company best known for its tankless water heaters and long-lasting manufacturing products that provide consistent performance. 

Rinnai tankless water heaters provide a constant supply of hot water while eliminating the energy waste of traditional storage water heaters. Rinnai produces electric, gas, and hybrid models and has been in business since 1942. 

rinnai tankless water heater review

Their tankless water heaters are marketed both in the United States and in other nations across the globe. Three different factories produce Rinnai water heaters all over the world. They are known for their durability, ease of use, and efficiency. You can trust a Rinnai tankless water heater to provide you with hot water for many years.

Since each model comes with a standard 10-year warranty, you can rest assured that they will last. However, if you purchase a tankless water heater from Rinnai, you can choose to extend your warranty to 20 years. While Rinnai water heaters are relatively expensive, the extended warranty and increased lifespan make the upfront cost worth it.

The Rinnai Tankless Water Heater uses a rapid response technology to provide a continuous hot water supply. You can use the device to heat the water in your home’s fixtures and appliances, including showers, toilets, faucets, and washing machines. 

Rinnai Tankless Water Heater Review: Types

Rinnai tankless water heaters can divide into four types or efficiency categories:

  • High Efficiency (HE)
  • Super High Efficiency (SE)
  • High Efficiency Plus (HE+)
  • Super High Efficiency Plus (SE+)

Let’s examine each type of model and find out how they differ.

1. High Efficiency (HE)

The most cost-effective Rinnai tankless water heater is the HE series. Non-condensing tankless heaters from the V line compose this series.

The V-series is the most affordable of all Rinnai’s water heaters, with the singular distinction of being the only one in its category. These heaters provide service to four fittings and have a Uniform Energy Factor (UEF) ranging from 0.79 to 0.82. 

With gas and propane variants available, the gallons per minute (GPM) rate ranges from 5.3 to 9.5, making it the most capable tankless water heater available and the most cost-effective when considering the initial cost.

The V-line has four additional model subcategories: the V53, V65, V75, and V94. The V53 is the type with the lowest cost, 5.3 GPM (Gallons Per Minute) flow rate, while the V94 is the most expensive, 9.8 GPM model.

The V53 tankless water heater from Rinnai perfectly synthesizes comfort, affordability, and efficiency. Compact, dependable, and simple to install, it is perfect for small- to medium-sized homes or flats. There are two V53 tankless water heater versions: the V53DeP (propane) and the V53 DeN. (natural gas). 

In the V-series of tankless water heaters, the V94 is the top model. There are five different variants of this unit. Three natural gas variants (the V94XiN, V94iN, and the V94eN)

 and two propane types (V94XiP and V94eP).

2. Super High Efficiency (SE)

Rinnai’s super high-efficiency models include sleek design, maximum efficacy, and a collection of characteristics ideal for the heated water needs of big households.

The RUCS SE series of tankless water heaters offer two types of natural gas (RUCS65iN and RUCS65iP) and propane gas (RUCS75iN and RUCS75iP). While the “75” models support 2-4 fixtures, the “65” versions only support a maximum of three fixtures.

The RUCS and RUS series are two major lines in this category that can each manage three fixtures simultaneously. Notably, both of these adhere to Energy Star standards with a.90 UEF score.

The GPM ratings for these heating lines range from 6.5 to 7.5 GPM.

3. High Efficiency Plus (HE+)

The RL and RLX model lines fall under this efficiency category. The Circ-Logic recirculation pump technology used by Rinnai in its HE+ series is one of the most noticeable differences between the series – HE and HE+. 

This system is capable of calculating when to turn on the pump. The unit will decide whether to accept or reject the request for the recirculation accessory. This implies that you can get heating water whenever you want.

Although the Rinnai RLX and RL types are comparable, the former is ideal for indoor use. It runs exclusively on natural gas while adhering to strict NOx emission standards, or ultra-Low NOx.

The RL model line consists of two unique models: the RL94 and the RL75, both of which come in indoor and outdoor versions. The RLX94i is the sole variant of the RLX model range.

4. Super High Efficiency Plus (SE+)

The top-of-the-line tankless water heaters from Rinnai are part of the Sensei SE+ series. The RU and RUR types are part of this series, with the latter being the most modern condensing water heater.

ThermaCirc360, Rinnai’s innovative recirculation system, is included in the top-tier RUR model. This distinctive and unique design uses an integrated recirculation pump and a thermal bypass valve to ensure that you can obtain hot water on demand without needing a separate return line.

Rinnai Tankless Water Heater Review: Features

Rinnai produces some of the superior tankless water heaters on the market, and here are a couple of aspects that render them an emphatic actor in the sector.


1. Energy Savings

When choosing a water heater, energy efficiency is a crucial factor to consider. Rinnai’s heaters have exceptional energy efficiency. They fabricate the High Efficiency (HE) tankless water heating series and the Super High Efficiency (SE) series.

Both the HE and SE Series present massive energy savings. Efficiency is rated using the Uniform Energy Factor (UEF), a conventional practice utilized to help property owners compare one product to another. Rinnai’s tankless water heaters maintain a UEF valuation between 0.81 and 0.97. 

The better the UEF score, the more effective the water heater.

2. Rinnai Circ-Logic 

Residents can use this feature to form cycles that fit their hot water consumption. Rinnai’s Circ-Logic is a circulating technology that offers hot water when desired; meanwhile, the circulation system will be inactive when there is no need for boiling water, saving you cash. 

Although most models from the SE, SE+, and HE+ Series are not suitable for Circ-Logic, these series can modify for the system. Make use of the app, add a Control-R module, and you can control your tankless water system distantly, analyze its execution, and even try to fix malfunctions. 

This feature allows you to share the necessary data with your professional and know the malfunction of your system beforehand.

Rinnai Tankless Water Heater Review: Pros and Cons

A tankless water heater can provide endless hot water on demand and save you space, money, and energy. Rinnai is a famous brand that offers several tankless water heater models. The advantages of these models can include cost savings on both energy bills and installation costs. 


However, there are also some cons to consider before investing in a Rinnai tankless water heater.

So without any further due, let’s look into the pros and cons of the Rinnai tankless water heater.


The benefits of the Rinnai tankless water heater include the following:

1. Energy Efficiency

Tankless water heaters generate hot water using 28-34% less energy than traditional tank heaters, which often need to be reheated throughout the day to keep your home warm. With a Rinnai model, this is optional, which saves you money in the long run.

2. Compact Size

Traditional Tankless Water Heaters take up around 30 cubic feet of floor space, whereas a Rinnai model takes up considerably less due to its size and wall-mounted design. This makes them perfect for smaller areas such as apartments or condos where floor space is at a premium.

3. Cost Savings

One of the most significant benefits of a tankless system is its energy efficiency. Tankless systems only turn on when you need hot water, whereas traditional units keep heated water stored in their tank around the clock—resulting in energy savings over time.

4. Temperature Control & Customization

A Rinnai tankless system is equipped with adjustable controls, allowing you to tailor your experience by choosing the right temperature for you and your family. You can also link multiple units together for larger spaces, such as office buildings and hotels.

5. Endless Hot Water

A significant pro for tankless water heaters is that you’ll always have warm and hot water, no matter how many people use the shower or washing machines, Etc.


A Rinnai tankless water heater is a significant investment. It provides hot water on-demand, is energy efficient, and is easy to install. However, it has a few drawbacks, and that includes:

1. Costly Installation Fees

Due to the complicated mechanical components needed to set up a Rinnai system effectively and accounting for any potential risks created by local pipe systems, water flows, pressures, etc., installing a Rinnai system typically necessitates the services of a professional plumber. 

All these factors will impact the overall effectiveness and result in extra labor costs charged back at high hourly rates for work performed and installing necessary pipework and connectors, Etc.

2. Depleting Internal Components

Another potential con of a Rinnai tankless water heater is that its internal components can deplete over time. While most parts have a long lifespan, they will eventually need replacement, which can be expensive and may require professional installation. 

Additionally, excessive use (such as running multiple showers or washing machines simultaneously) may cause these components to wear out faster than usual.

3. Inconsistencies in Hot Water Temperature

Finally, another potential con associated with a Rinnai tankless water heater is inconsistencies in hot water temperature from one tap to another tap within the home due to different temperature settings and distances between points-of-use and the unit itself located inside or outside the house. 

This problem can be solved by having an expert install separate control valves around your home but doing so would add more cost to your overall purchase price.

4. Limited Storage Space

The biggest drawback of Rinnai tankless versions is their small storage capacity, which means you won’t be able to hold significant quantities of hot water in them as you could in conventional storage tanks that employ internal thermostats to control temperatures or have large amounts until needed. 

So keep these factors in mind and make enough preparations before installing one!

Rinnai Tankless Water Heater Review: Installation 

The Rinnai Tankless Water Heater is easy to install. It can install in an open or closed-loop system. 


This means that the Local Building Code will determine the requirements in your area. Before starting the installation process, ensure you have all the necessary tools and materials, including a water pressure regulator, an expansion tank, and a pressure relief valve. 

First, shut off the gas supply to the heater. Next, install the water lines, pressure regulator, and expansion tank. Finally, connect the gas line to the unit and test the system for leaks.

Rinnai Tankless Water Heater Review: Performance 

The Rinnai Tankless Water Heater performs well with a maximum flow rate of 19 gallons per minute (GPM). This is less than some comparable water heaters but has a lower minimum flow rate, which is essential if you want to save energy. 

The minimum flow rate is 1.0 GPM. To achieve this, you should consider installing a pressure-reducing valve. The Rinnai tankless water heater has an energy factor of 0.82. This is lower than other water heaters but has a higher minimum flow rate. 

Rinnai Tankless Water Heater Review: Cost of Installation

The installation cost will vary from place to place, but generally, it will cost around $800 to $3,000 to have a Rinnai tankless water heater installed, depending on the model you choose and the size of your home. 


You may also have to hire a plumber to do the installation. Most manufacturers recommend hiring a professional, as it can be unsafe to install the device yourself. It would help if you also consider the cost of any necessary repairs down the line.

Rinnai Tankless Water Heater Review: Maintenance and Repair Needs

Since Rinnai tankless water heaters don’t have tanks, you will not have to worry about cleaning those out. However, you will have to clean out the filter regularly. You should also test the water pressure every three months by pushing on the inlet valve while the water is on. 

If the pressure is low, you should have a technician visit your home to make some adjustments. You will also have to check the electric connections regularly to ensure they are secure. If you notice any corrosion or discoloration, consider calling a technician to check the connections and make any necessary repairs.

The cost of repairs will vary depending on the model you choose and any issues that arise. However, you can expect to pay around $100 to $300 for repairs. 

Most tankless water heaters come with a standard warranty of 10 years. If something goes wrong with your unit, you can send it for repair or replacement, and the company will cover the cost.

Rinnai Tankless Water Heater Review: Warranty

One of the standout characteristics of Rinnai’s tankless water heaters is its warranty. Depending upon the model utilized, each heater comes with a 10 or 12-year warranty on the heat exchanger, supplemented by 5 years for parts and 1 year for labor. 

Extended labor coverage is an option for certain more advanced heater types, and it’s frequently thought of as a wise investment for heaters installed in stable homes. Registration for this extended protection must do within 30 days.

Rinnai Tankless Water Heater Review: Potential Savings

The amount you can save depends on how much electricity your home uses and how often you use your water heater. 

The Department of Energy estimates that an average family can save around $100 a year by installing a Rinnai tankless water heater, compared to a traditional water heater. 

You can save even more if you have an older water heater that requires much energy or a larger family that uses much hot water. According to the Department of Energy, a family that uses 10,000 gallons of hot water per year can save $100 a month by installing a Rinnai tankless water heater.

Rinnai Tankless Water Heater vs. Competitors

There are plenty of other tankless water heaters on the market, though few come close to matching the quality and performance of the Rinnai Tankless Water Heater. 

The Rinnai Tankless Water Heater is one of the best-reviewed models on the market and is widely considered the standard for residential tankless water heaters. 

rinnai tankless water heater review

The Rinnai Tankless Water Heater has a higher minimum flow rate than other comparable water heaters, but this is a benefit, as it will save energy. 

The Rinnai Tankless Water Heater is a top-of-the-line model with all the features you need to enjoy hot water whenever you need it. It is the ideal choice for homeowners who want the best.

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Conclusion: Rinnai Tankless Water Heater Review

A Rinnai tankless water heater is an excellent investment for your home. It provides hot water on-demand, giving you constant hot water without worrying about running out. 

Rinnai tankless water heater is incredibly energy efficient, saving you money on your energy bills. With a wide range of models to choose from, one is sure to meet your needs.

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