Best Rinnai Water Heaters: Reviews & Buying Tips

Explore, review, and purchase the most energy-efficient and Energy Star certified Rinnai water heaters for residential potable water heating and light commercial applications, and save.

Read reviews of popular Rinnai tankless water heaters from the V, RL, RU, RUCS, RUS, RUC, and RUR series, as well as boilers, including the latest Sensei line. These models feature and without condensing technology, Wi-Fi capability, and smart technology, all powered by natural and propane gas.

Best Rinnai Water Heaters: Reviews & Buying Tips
photo: rinnai

Check the specifications, online prices, and selection of top sellers to shop with confidence. If you encounter any problems, refer to the list of provided Rinnai error codes and troubleshooting tips.

Rinnai Water Heaters: Buying Tips

Things to Consider

Rinnai water heaters are small and compact tankless appliances that utilize the latest innovative technology, providing an endless supply of hot water to one or multiple fixtures simultaneously in an efficient manner.

Rinnai tankless water heaters can be used to heat domestic water in homes, commercial applications, and mobile homes, regardless of the plumbing configuration or roof construction.

According to the manufacturer, there is a model available for any home type that uses either natural gas or propane (LP).

The small size, with dimensions of approximately 19″ x 26″ x 10″, makes it perfect for wall installation either indoors or outdoors, freeing up floor space for other uses. Due to its compact and lightweight design, one person can easily handle Rinnai tankless units, making installation more cost-effective.

The state-of-the-art design enables more interaction between the unit and users, allowing for Wi-Fi connection and remote monitoring and control using smartphones, including voice control commands.

Users have already confirmed the quality of Rinnai water heaters and gas boilers, which can be seen in the “Most Popular Products” magazine, a builder magazine where Rinnai was voted as the #1 HVAC manufacturer.

Top-Selling Models

Looking to buy Rinnai water heaters? Look no further! Below is a list of the best-selling Rinnai gas models available online. These models have received high praise for their:

  • Ultra-efficiency
  • Reliable operation
  • Recirculation
  • Easy installation
  • High-quality components
  • Long life
  • Low gas emission
  • Flexible venting
  • Lots of power
  • Small size

Rinnai water heaters are available at prices ranging from $600 to $2300, while installation costs vary from a few hundred to over a thousand dollars.

Most of the top Rinnai models come with a limited warranty of 15 years for residential applications and 8 years for commercial use, making them one of the longest-lasting models in the industry. Economy models, such as those in the V series, have a shorter warranty of 10 years.

Features and Benefits

High Efficiency

Owners of Rinnai water heaters enjoy numerous benefits, including reliability, on-demand hot water supply, almost instant and endless hot water, up to 40% energy savings, and high energy efficiency ranging from 82% to over 90%.

And if you want to take your energy efficiency game to the next level, look no further than the condensing models from the RU, RUR, and RUC series, which have the highest energy factor of 0.96!

Water Flow

Experience the luxury of hot water that’s delivered quickly, consistently, and accurately with Rinnai’s innovative technology. Say goodbye to fluctuating water temperatures and waiting for hot water to arrive. With Circ-Logic recirculation program, some models cycle an external pump for better comfort and higher efficiency, providing hot water only when you need it, saving you both time and energy.

But that’s not all. Rinnai’s tankless and condensing models from the RUR series take it one step further, utilizing recirculation technology with a built-in pump and thermal bypass valve, dedicated recirculation line mode, and an impressive water flow rate of up to 9.8 GPM on select models like RUR199, RUR98, RUC98, and RU98. That means you’ll waste less water and wait less time for hot water.

And for those who want the convenience of recirculation without a dedicated line, Rinnai’s ThermaCirc360 system has got you covered. With bypass technology and an internal pump, the cold water line is used as a return line, making it a perfect solution for existing homes where a recirculation line is hard to install.

Rinnai’s commitment to innovation and efficiency means you can have the luxury of hot water without sacrificing energy savings or performance.

Smart Control

Hot water recirculation just got smarter with Rinnai’s Control-R Wireless module! Not only can you control it from your smartphone, but you can also install a Wireless Push Button or Wireless Motion Sensor near the point of use, ensuring fast and consistent hot water at the perfect temperature. But that’s not all; the Control-R Wireless module can also be paired with Amazon Alexa for hands-free voice activation!

But Rinnai’s smart technology doesn’t stop there. You can receive automatic maintenance alerts and even choose a monitoring dealer for remote diagnostics. This ensures that your water heater is always performing at its best, which means maximum efficiency and savings for you.

And if you want even more control, Rinnai offers a 24-hr programmable digital controller. You can schedule multiple operations throughout the day to meet your specific usage patterns and ensure hot water is available at any fixture, at any time. While most water heaters come with a standard controller, Rinnai offers additional optional controllers to suit your needs.

Venting Options

Rinnai water heaters offer unparalleled flexibility with their direct vent sealed combustion and adaptable installation options. These water heaters can be installed on almost any interior or exterior wall, making them ideal for both residential and commercial applications. In addition, models from the RUR and RUC series offer even greater flexibility and faster installation with the inclusion of a concentric and dual venting PVC/CPVC option on the same unit. This feature streamlines the installation process while also reducing the overall installation cost.

Environment-Friendly Design

Rinnai tankless water heaters have emerged as a world leader in heating systems, thanks to their superior advantages. They are eco-friendly, operating with reduced energy and water consumption, resulting in fewer NOx and CO2 emissions. With a long lifespan of up to 20 years, Rinnai water heaters reduce waste in landfills. Moreover, all components are replaceable and recyclable, further enhancing their sustainability.

However, it’s important to note that the actual performance life of gas burners and other heater elements depends on various factors such as proper installation, quality, usage rates, environmental conditions, and maintenance. Regular maintenance and upkeep can significantly extend the lifespan of Rinnai water heaters, allowing them to operate at their peak efficiency for years to come.

Best Advanced Models to Buy

Rinnai’s RUC and RUR series, from the SE+ and Sensei series, are among the best tankless water heaters on the market. These models are designed with condensing technology, ultra-low NOx operation, smart technology, and offer the highest efficiency and water flow rate available on the market.

The RUC98i is the largest and most advanced water heater in the RUC series. With a flow rate of 9.8 gallons per minute, it can provide hot water for up to four bathrooms. This indoor unit is ultra-efficient, thanks to its ability to modulate power from 15,200 to 199,000 BTU and preheat water within the secondary heat exchanger. As a result, the RUC98i saves energy and money.

The ability to modulate the power from 15,200 to 199,000 BTU and pre-heat water within the secondary heat exchanger ensures that the RUC98i model operates with reduced energy losses, providing great energy and money savings.

The RUR series includes two outstanding models: the RUR98 (SE+ series) and RUR199 (Sensei SE+ series). These Energy Star models use recirculation technology to provide hot water fast and maintain a stable temperature, improving efficiency, comfort, and user experience. They have an energy factor of up to 0.95 and a maximum water flow rate of up to 11 GPM, making them perfect for large homes regardless of weather conditions.

The Sensei series includes the RUR199i/e, the most advanced model on the market. It features an integrated check valve in the venting system and electronics that protect the unit from freezing weather (-4 F for the outdoor unit and up to -22 for the indoor model). Additionally, the Control-R Wi-Fi module enables remote control, and Alexa integration provides voice activation.

These water heaters are easy to install with concentric or twin pipes up to 150 feet. They come with a smaller, lighter, and less expensive upgraded vent system that offers 14 possible configurations for greater flexibility.

Lastly, these models come with a long 15-year warranty, providing peace of mind and assurance that they are a smart and worthwhile investment.

Top Affordable Models to Buy

Rinnai’s condensing water heaters are highly efficient but also more expensive. For homeowners on a budget, we have selected the top affordable Rinnai models that provide all the benefits of tankless technology.

One great option is the Rinnai RL75, which boasts an energy factor of over 0.80, a maximum gas input of 180,000 BTU, and a water flow rate of 7.5 GPM, making it suitable for homes with up to three showers in use simultaneously. This environmentally-friendly unit has ultra-low NOx gas combustion like the most advanced models.

With the Circ-Logic technology, the RL75 model can be used in recirculation mode to deliver hot water quickly. Additionally, it can be remotely controlled, monitored, and diagnosed with the Wi-Fi and Alexa capabilities.

Another great and affordable model to consider is the Rinnai V65 from the Value series. It is smaller than the RL75 but still has quality features and provides decent comfort for less. This model is recommended for smaller homes and for up to two simultaneous showers. It is available for indoor and outdoor installation and can use either natural gas or propane.

Model Selection

Sensei SE+ series (with condensing technology)

  • RUR series (RUR199i/e, RUR160i/e, RUR98i/e)
  • RU series (RU199i/e, RU180i/e, RU160i/e, RU130i/e, RU98i/e, RU90i/e, RU80i/e)
  • RUC series (RUC98i/e, RUC90i/e, RUC80i/e)

SE series (with condensing technology)

  • RUCS/RUS series (RUCS75i, RUS75e, RUCS65i, RUS65e)

HE+ series (non-condensing)

  • RL series (RL94i/e, RLX94i, RL75i/e)

HE series (non-condensing)

  • V series (V94i/e, V94xi, V75i/e, V65i/e, V53e)

(note: i – indoor, e – outdoor)

Compare Rinnai Models

Model typeNon-condensing
Super high-efficiency
Energy StarNoNoNoYesYes
Water flow

Pros and Cons


  • A great number of models to choose from: Rinnai offers a wide variety of tankless water heaters to choose from, with different sizes, designs, and features. This makes it easy to find a model that suits your specific needs and preferences.
  • Never run out of hot water: With a tankless water heater, you never have to worry about running out of hot water, as it heats water on-demand.
  • Consistent supply of hot water: Tankless models provide a consistent supply of hot water, as opposed to tank-type heaters that comes with the limited supply.
  • All Rinnai models are used for the whole house and point-of-use residential and commercial heating: They offers both whole-house and point-of-use models, making it possible to use their products for various applications.
  • Condensing models come with ultra-efficiency: Rinnai’s condensing models are among the most efficient on the market, with Energy Factors (EF) ranging from 0.82 to 0.96.
  • Unnoticeable cold water sandwich effect due to the modulating gas burner and capability to work with the recirculating pump: Rinnai’s tankless water heaters use modulating gas burners that adjust the heat output based on demand, resulting in a more consistent temperature and reducing the chance of experiencing a cold water sandwich effect.
  • Some indoor models have the digital temperature controller built-in, while others have the controller supplied: Depending on the model, Rinnai’s indoor tankless water heaters may come with a built-in digital temperature controller or a separate controller that is supplied with the unit.
  • Simplified problem diagnostics through displayed error codes: They feature an advanced diagnostic system that displays error codes to help identify and troubleshoot problems.
  • Wi-Fi capable: Many models are Wi-Fi capable, allowing for remote monitoring and control through a smartphone app.
  • Fast hot water delivery with recirculation: They can be used with a recirculation system to deliver hot water quickly and efficiently.
  • Environment-friendly design with ultra-low NOx gas emission: Rinnai’s tankless water heaters are designed to be environmentally friendly, with ultra-low NOx gas emissions.
  • It takes little space, saves wall and floor space – makes the installation easier: Tankless units take up less space than traditional tank-type heaters, freeing up valuable floor and wall space in your home.
  • Flexible vent installation with long pipes: They have flexible venting options, making it easier to install them in a variety of locations and configurations.
  • Every part is replaceable: If a part of your device fails, it can be easily replaced, extending the life of the unit.
  • There is no pilot light; the ignition is electronic and automatic: Rinnai’s water heaters use an electronic ignition system, eliminating the need for a pilot light.
  • The noise level is low: They are designed to operate quietly, with noise levels ranging from 46 to 53 decibels.
  • Contribute to LEED certification: Rinnai’s heaters can contribute to LEED certification, as they are energy efficient and environmentally friendly.
  • Improves Home Energy Rating Index scores: Installing a Rinnai heater can improve your home’s energy efficiency and Home Energy Rating Index (HERS) score.
  • Up to 15-year limited warranty on the heat exchanger for residential use: The manufacturer offers a limited warranty of up to 15 years on the heat.


  • For some consumers and specific models, it may take several minutes for hot water to be delivered to their point-of-use location. However, this depends on how far away the point-of-use is located. For others, there is no significant increase in the time it takes to get hot water compared to tank-type heaters.
  • The LC code can sometimes appear due to calcium buildup and hard water issues. To prevent this, it is recommended to purchase a water treatment system or flushing kit and periodically flush the unit.
  • The condensing model can be more expensive to buy than non-condensing models. However, they offer higher efficiency and may save money in the long run on energy bills.
  • Installation of Rinnai tankless water heaters can be challenging, especially for those who lack plumbing and electrical experience. It is recommended to have the unit installed by a professional to ensure proper installation and operation.
  • Professional installation is expensive.


After analyzing hundreds of customer reviews, it is evident that Rinnai tankless water heaters have received high satisfaction ratings. In comparison to other popular brands like Noritz, Takagi, or Bosch, Rinnai’s quality stands out as a top-performing brand that provides “endless comfort and performance.”

As demonstrated in the Noritz vs.Takagi vs. Rinnai comparison, Rinnai outshines its competitors in terms of reliability, efficiency, and innovative technology. Therefore, if you are looking for a reliable and high-performance tankless water heater, Rinnai is a top choice.

About Rinnai

Rinnai Corporation is the distributor of Rinnai water heaters, owned by Rinnai Japan. Founded in the 1920s, this Japanese manufacturing giant started producing gas appliances in the early 1930s. Since then, Rinnai has expanded its distribution operations worldwide. In 1974, the company began operating in North America, and in 2001, a new state-of-the-art distribution, research, and training facility was opened in Peachtree City, Georgia.

One of the things that sets Rinnai apart from other manufacturers is that it produces all components and parts for its water heaters. This allows the company to maintain complete control over the quality of its products, ensuring that every Rinnai water heater is manufactured to the highest standards. With decades of experience and expertise, Rinnai is a reliable and trusted brand that is committed to providing innovative and efficient products to meet the needs of customers worldwide.


How Often Should I Flush My Rinnai Tankless Water Heater?

It is recommended to flush your Rinnai tankless water heater at least once a year to prevent mineral buildup and maintain optimal performance. However, the frequency of flushing may depend on the hardness of the water in your area and the usage of the unit. If you notice a decrease in performance or receive an error code indicating a problem with the heat exchanger, it may be necessary to flush the unit more frequently. It is always best to refer to the manufacturer’s instructions and consult with a qualified technician for proper maintenance of your Rinnai tankless water heater.

What Is Code 11 on a Rinnai Tankless Water Heater?

If you see a Code 11 on your Rinnai tankless water heater, it suggests that the ignition process has encountered a problem. This error code implies that the system tried to ignite but failed after three attempts. This issue may be caused by several factors, such as a dirty burner, gas supply issues, or a malfunctioning spark electrode.

Why Is My Rinnai Water Heater Beeping?

A beeping sound from a Rinnai water heater usually indicates an error code. The error code is the unit’s way of communicating an issue that needs attention. The number of beeps and pauses between the beeps will correspond to a specific error code. To determine the cause of the beeping, you will need to consult the owner’s manual or contact a qualified technician.

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