Thankful For Tankless: Rinnai Tankless Water Heater Review

It’s a tankless job, but somebody’s got to do it. You’re in the market for a tankless water heater and have trained your sights on Rinnai. The first step: Read a Rinnai tankless water heater review and see what you can learn (other than silly puns, that is.)

What you’ll find is that Rinnai is one of the most popular brands for water heaters. The company estimates its technology is heating water for 30 million households or organizations worldwide.

Rinnai is a Japanese company founded in 1920 as a manufacturer of pressurized oil cooking stoves. It has recently been expanding in North America, with an estimated two million water heaters installed.

Is a Rinnai the right choice for you? The answer begins with one of the best Rinnai tankless water heater reviews.

What Are Tankless Water Heaters?

The chances are good that you’re familiar with the basic functionality of the conventional water heater. It utilizes a storage tank to keep a supply of water at the ready for showers, laundry, big cleaning jobs, or more.

How is a tankless water heater different? Tankless water heaters provide hot water on demand. When you turn on your shower, faucet, or washer, cold water flows in through a pipe and is heated instantly by either a gas burner or electricity.

Tankless water heaters require much less space. and save on utility costs since they don’t have a tank to warm all the time.

The downside: the dreaded moment you run out of hot water. If you have several things going on at once, you might outstrip the capacity of the device. Tankless heaters also require more ongoing maintenance.

Keep these differences in mind while reading these Rinnai reviews.

Rinnai Tankless Water Heater Review

Rinnai V65iN Non-Condensing Natural Gas Tankless Water Heater, Indoor Installation, Up to 6.5 GPM
  • Original Design: Tankless hot water heater only heats when necessary to conserve energy; For the latest in non-condensing technology and a cleaner layout that speeds up service and installation, check out our new RE160iN model
  • Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 6.5 GPM (5 fixtures at once)

Rinnai markets home tankless water heaters in two categories: high-efficiency and super-high efficiency. The most significant difference: the Rinnai SE line puts out slightly more gallons per minute than the high-efficiency line.

It’s not the subject of this Rinnai tankless water heater review, but note that the company also manufactures a line of hybrid tankless water heaters for commercial use. These devices combine the instant heat capabilities of tankless with an onboard storage tank.

In the high-efficiency category, consider the Rinnai V65IN HE tankless water heater. The V65IN offers an output of 6.5 gallons per minute, which the company says is “ideal” for small-to-medium new homes or remodels.

The high-efficiency water heater is WiFi-capable. It’s also highly compact. The company says the heater is the “size of a small suitcase.”

In contrast, make the RU199IN part of your Rinnai tankless water heater review if you are looking for something bigger. The Rennai RU199N is also intended for indoor installation and is WiFi capable.

This super-high efficiency device completely warms 11 gallons per minute.

Rinnai RU199iN Condensing Tankless Hot Water Heater, 11 GPM, Natural Gas, Indoor Installation
  • Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended
  • Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary

Both the V65IN and RU199IN are gas water heaters.

Customer Reviews

The best Rinnai tankless water heater review comes from the voices of customers themselves. Both the V65IN and RU199IN do well on that front.

The V65IN receives a ranking of 4.3 stars out of 5.0. Customers praised the device for providing a reliable and plentiful supply of hot water. Less positive reviewers wrote of their disappointment with the installation process and of some hiccups in customer service.

The RU199IN gets a ranking of 4.4 stars out of 5.0 on Amazon. Reviewers praised the water heater’s performance and consistency in putting out hot water when needed.

However, customers also struggled to find the right professional help for installing and reported consistent water heating performance.


  • Compact installation
  • Saves on energy
  • Hot water on demand


  • Challenging installation
  • Inconsistent customer service and support

How We Reviewed Tankless Water Heaters

Water heaters are the building blocks of modern life. In crafting our Rinnai tankless water heater review, we consulted a variety of sources.

We started, of course, with the Rinnai U.S. website, which offered a clear sense of the features of their water heater line and the benefits of tankless.

To help supplement and cross-check our information, we consulted other sites such as Consumer Reports, water heaters, and Reviews. That last site helped us pick out a few competing models to compare against Rinnai.

On top of all that, we also read reviews of people who experience the Rinnai brand. Out of all that information came this Rinnai tankless water heater review.

Ecosmart ECO 36

Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater
  • Sleek and compact design with digital output temperature display
  • ECOSMART tankless water heaters are 99.8-percent energy efficient

The Ecosmart ECO 36 is one of the most popular water heaters. In contrast to the Rinnai, the device is electric.

The ​ECO 36​ says it heats 3.5 gallons of water per minute (but that will vary depending on the starting temperature.) That should be enough to handle multiple quick showers simultaneously.

Amazon reviewers give the ECO 36 4.0 stars out of 5.0, based on nearly 2,500 reviews. Positive reviewers praised the unit for its output and energy efficiency, while less enthusiastic customers struggled with warranty issues and occasional defects.

Gasland BE158 Tankless Water Heater

Tankless Water Heater, GASLAND Outdoors BE158 1.58GPM 6L Outdoor Portable Gas Water Heater, Propane Water Heater, Overheating Protection, Easy to Install, Use for RV Cabin Barn Camping Boat, White
  • 🎁【Safety Certificate】 Our products were certificated by CSA North America, safe as per Canadian and US Standard. Flame failure device, anti-freezing protection, over heating protection to ensure the family safety. Automatically decrease water pressure between 3.6-110PSI. The anti-freezing drain plug can discharge the residual water to avoid freezing or in case of long time no use. High water temperature protection over 167 °F. Shut off gas supply automatically under unexpectable flameout.
  • 🎁【Lightweight Portable Design】 Compact size and lightweight design for easily carry. It can bring a amazing hot shower for you when you are camping, to the beach, etc. Also you can wash your pets with this tankless water heater in outdoor. Hang it using the mounting bracket on the top/back of the gas water heater. It only takes you a few minutes to install it. Or you can install it according to the instructions.

Tankless water heaters open up a world of new applications. So, if your house is a tiny home or an RV, consider the Gasland BE158 Tankless Water Heater.

This device doesn’t provide large output — only about two gallons per minute. But that’s OK. Since it’s intended for camping or other outdoor hot water needs.

As such, the BE158 is portable and available for various uses — and not just for camping. Maybe you live by a beach, and your family would benefit from an outdoor shower, or you’d like to give your pet a bath that isn’t cold.

The Gasland BE158 receives a ranking of 4.3 stars out of 5.0 on Amazon. Positive reviewers found the device easy to install and praised it for providing a consistent source of hot water.

In contrast, more negative reviewers had customer service problems and complained of occasional defects or other malfunctions.

Stiebel Eltron 29 Plus Tempra

Stiebel Eltron 239223 Tankless Water Heater – Tempra 29 Plus – Electric, On Demand Hot Water, Eco, White, 23
  • On demand a continuous and unlimited supply of hot water
  • Sleek design saves space and no venting required

Depending on how hot you want your water to be, another potential option for a whole-house water heater is the Stiebel Eltron 29 Plus.

The Stiebel line comes with a range of different options to fit different situations. Depending on the starting temperature of the water, you could see 4.5 gallons per minute.

Stiebel’s Eltron 29 Plus is another option for anyone looking for an electric water heater. It’s compact enough to hang on a sidewall.

Amazon reviewers give the Stiebel Eltron a ranking of 4.3 stars out of 5.0. Positive reviewers found the device easy to install even for do-it-yourselfers and liked the power output.

Customers on the unhappy end of the spectrum experienced what they considered to be premature breakdowns.

Takagi Gas-Powered Water Heater

Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas
  • 140,000 BTU. Voltage: AC 120V
  • 6.6 GPM max flow rate. Water connection location- bottom

If you are a homeowner seeking to install a tankless water heater, you need to pay attention to this Takagi tankless water heater. You don’t have to worry about the price because it a pocket friendly. It might seem not costly, but it comes with a unique feature that other tankless water heaters have in today’s market.

Suppose you have Takagi T-KJr2, a natural gas-powered water heater that is the best for home instant showers. It is best because you won’t pay an anymore higher power bill. Even with less power consumption, you are guaranteed to get a high hot water output to meet your demands. The output is 6.6 gallons per minute which is the minimum unit for a rated flow, and this will run on a 140,000 BTU. Also, this appliance is portable and lightweight. 

Bosch Tankless Water Heater

Bosch Greentherm C 1050 ES NG Tankless Water Heater, Natural Gas
  • 199,000 max input (BTU)
  • Benchmark temperature stability achieved with an active bypass

This type of tankless water heater delivers optimal performance and is environmentally friendly. Also, it performs well in energy efficiency; for instance, the Bosch Greentherm Model C 1050 ES has an energy factor (EF) of 0.95. This makes this appliance perform well in star rating.

Bosch has its added advantages because of the automatic fully modulating bypass. This ensures you can regulate the temperature, introduce new venting, and add a mobile app making it easy to monitor its performance.

If you need a type with push-button ignition, you will need to order a Therm 520 PN model. In addition, you will be able to modulate the gas valve to ensure the water is at the required temperature in a varying rate flow. It’s perfect for a small household and will be perfect with two hot water outlets running simultaneously.

Marey Tankless Water Heater

Marey ECO110 220V Self-Modulating 11 kW, Small, White
  • The 220V ECO 11kW unit is ideal for 1 simultaneous points of use in US Southern Regions where the incoming water temperature is above 70°F. In colder regions, it is suitable for a sink at 1. 3 GPM.
  • German-designed with high quality stainless steel water channel and heating chamber.

The Marey ECO is smart tankless water that you can choose to use. With Marey ECO, you are sure to get hot water depending on the temperature you need because this appliance gives you up to 27Kw of power and 112.5 Amp. This uses smart technology and a digital panel automatically, allowing you to control its operation.

Once you have set your device, you won’t need to repeat it as it will give you hot water for a more extended period. This amazing technology makes it unique with its sediment and limescale proof.

You cannot compare Marey ECO with traditional water heaters on how they use power. Having Marey, you will save up to 60 percent of your electric bill, making it ideal for a home with up to four bathrooms. With this Marey, you don’t have to worry about its life because they are durable and has Nickel-Chromium heating elements. It is certified for use anywhere worldwide.

The Delight of Hot Water

image credit: Pixabay

There’s nothing better than a hot shower or bath after a long day at work or a long trip. That’s why water heaters have become such indispensable appliances.

Which water heater is the best? That’s going to depend on many factors that are particular to your case. Bigger homes will need more capacity. We like the fact that Rinnai has a full line of water heaters available to serve your needs. They are affordable, easy to understand, and relatively simple to install. They also have history on their side as a 100-year-old company.

While we can’t know what your situation is, we would lean toward the reliability of Rinnai.

What Are Some of the Common Problems Associated With Tankless Water Heaters?

Mineral Build-up

This happens in both modern and traditional water heaters. It will help to keep an eye inside your water heaters for any signs of mineral build-up. If you are using hard water, there is a high potential of damaging mineral build-up because these are water with high mineral content.

The main minerals that cause this scaly build-up are Calcium and Magnesium. These two minerals can affect the function of your water heater if you are not keen to address them. Suppose you are using tap or borehole water; consider checking on the water filter of your tankless water heaters.

You don’t need to clean up your tankless water heaters daily, but regular maintenance will ensure your property lasts longer. If your water source is mainly well, you need to note that they carry a lot of debris. And won’t be possible for the water to travel through the narrow path to the heat exchange.

To avoid any issue related to mineral build-up, you need to flash out the water every six months. You can use Eccotemp EZ-Flush System Descaler Cleaning Kit, and you’re sure to get rid of any debris building up. If you cannot acquire a hook-up, you don’t have to worry but get a valve bypass kit to help you clean up.

Air Supply Blockage

If you are using tankless water heaters, you may receive an error on the LED screen, which means the air supply or exhaust is blocked. At this point, you will notice that your system is having a problem with either venting or combustion. To save this situation, you need to inspect all vent pipes to ensure they are free from puncture and are appropriately connected.

If you’re not in a position to check on the background status, then you can hire a professional to help you. Furthermore, if your tankless installation is too close to another object, that can cause a shortage of air supply. Always be keen because an issue can occur that can create a fire hazard.

Ensure to hire a professional to do an inspection and get rid of obstacles that might cause your water heaters not to function as expected. Check whether birds or rodents have their nest build on your piping system and get rid of them. So, you need to know where your vent’s location for easy observation.

System Overload

The capacity of your tankless water appliance varies, and if you are using many appliances, you’re likely to get an overload. This will cause your water heater to struggle to supply the heat and may end up shutting down because of oversupply. To avoid this, you need to reduce the number of hot water appliances you’re using at a time then you can reset your unit.

However, you may experience the same recurring situation, and then you will get a higher tankless water heater with a high capacity. Even though this might be costly but will save you money as you avoid hiring professionals to repair because of damages associated with overloading. Also, it will save you time and the amount of gas you will be using at your home.

Ignition Failure

Sometimes you try to ignite your water heater, but it fails. Often you will find that you might be having a problem with your gas supply, so you need to check on your tank before you can proceed to ignite. Suppose your gas or water valve fails to open, then you will receive ignition failure.

At some point, you will find that this step does not solve your ignition problem, then you might be experiencing a more significant challenge. You don’t need to worry about doing the project alone because you might worsen the situation. It will help to get a professional to help you recognize the issue and replace any parts needed.

Why Do You Need a Plumber to Repair Your Water Heater System?

If you’re not receiving enough hot water for all your home duties, you must have issues with your water heater system. You will need to contact a licensed plumber to assist you in finding the solution. Ensure the profession your hiring offers tankless water installation and repair of any kind.

In addition, you will have to acquire extra services that include plumbing repair services for broken sump pumps, clogged drains, broken water lines, and cracked gas lines. Problems associated with this tankless water heater are minimal, and that is why you need to install them for your house use.

What Are the Types of Tankless Water Heating Systems?

Today’s markets have different types of tankless water heating systems. This is essential to understand the difference so that you can know which one will suit your needs. Let’s take a look a look on some of these effective tankless water heating systems.


These are second-generation heaters meant to heat water, giving you a higher energy efficiency of between .92 and .94. With such efficiency, you’re sure to save your money on power bills.

Other than the advantage of units, you can also vent this appliance with less expensive PVC materials. But the downside of these condensation units is costly to get as compared to non-condensation units.


These are the first-generation tankless water heaters. The unit provides you with hot water that you desire and comes with an efficiency factor or EF of between .82 and .85. With non-condensation, you can save on power expenses compared to traditional water heaters that use tanks.

The limitation with Non condensing is that they deliver hot exhaust. This makes it challenging to install expensive stainless-steel venting. Also, there is a lower efficiency if you use water in frequent shorty draws, such as washing hands.

Point of Use (POU)

You need this unit to avoid any heat loss that you will experience in the hot water distribution system. This might look self-explanatory because its name implies that your system will heat water close to the outlet.

It will help to have this because you will be boosting the temperature of water away from your central water heating position. This device provides better energy efficiency, especially if you install it at your premises. However, installing these Point of Use heaters separately will be costly, for instance, kitchen sink, laundry, and bathrooms, because you will need to purchase for every service. 

Fuel Types You Will Need to Use in Tankless Water Heater

Before you can proceed to install the tankless water heaters, you need to consider the fuel type you will use. Depending on the fuel you choose, that will determine the unit’s size, energy efficiency, and usage.

The fuel type will determine how much you are going to spend on your hot water needs. If you’re changing your home, then it’s best to choose the right type of fuel you will use because changing an already installed fuel tank might be expensive.

You will need to consider any of the three basic fuel types for choices to use in your tankless water heating systems. Some of these fuel types include gas, propane, and electricity. When choosing, you need to check whether you can easily access them in your local location. To help you make the right decision here is some helpful information you need about each fuel type.


The use of propane is economical in terms of energy cost. With the rising cost of living, heating water with propane will save you more than using electricity. This means you’re not only going to save money in the long term but also get a constant supply of water to meet your demands.


There are many tankless water heaters powered by electricity and are cheap to buy and install. But you need to know that you are going to use high energy power to operate them. Also, if you need to upgrade your water heating system, you’re likely to do it at a high cost.

They come with a unique design which isn’t the same case with tankless gas systems. You can easily maintain a tankless electric system and repair them in case there is a problem.

Natural Gas 

If you decide to use natural gas to power your tankless, you’re going to save on cost compared to propane and electricity. Natural gas has a better performance and lower operating costs. Even though you will need a professional to service them regularly, you still get high heat output.

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