What Is The Best Tankless Hot Water Heater

Best Tankless Water Heaters Of February 2022

Take into consideration how your family will utilize the tankless water heater when attempting to choose where to begin your search for the finest tankless water heater. You may be considering completely replacing your old tank water heater, in which case a large-capacity whole-house tankless water heater may be the ideal option for you. In the case of an extension, wet-bar installation, or the elimination of a long plumbing supply line, you may find that a smaller point-of-use water heater is the best choice for your needs.


The capacity of a tankless water heater is measured in gallons per minute of hot water it can supply at a given time. Once you’ve determined whether you want a whole-house water heater or a point-of-use water heater, you’ll need to figure out how much hot water you’ll need and how much hot water your water heater will need to deliver. The size of your new tankless water heater will be determined by this factor. How big a tankless water heater you need depends on a number of factors, including the number of people living in your house, the desired temperature rise, the maximum flow rate, and the climate in your neighborhood.

Power Source

The power source you choose will have an impact on the entire cost of your tankless water heater. Energy savings are realized over the long term with tankless water heaters as opposed to standard water heaters with a tank. It is possible that the amount of money they save will be determined by the type of energy sources accessible to you. Making a decision on which power source will be used to run your tankless water heater might be difficult if you have access to both natural gas and 240-volt electricity.

Water heaters that are powered by electricity will be less expensive to purchase and install than those that are fueled by natural gas or propane.

The Best Tankless Water Heater in February 2022 (Reviews)

It might be challenging to make a decision on a tankless water heater. There are hundreds of models and brands available, as well as a plethora of industry jargon that might be difficult to comprehend. That’s why we devoted hundreds of hours to researching and assessing the top water heaters available on the market. In previous guides, we’ve discussed topics such as tankless water heater installation and costs, as well as electric water heaters. We’ve also written about the trustyhybrid water heater, which we believe is the greatest form of water heater on the market right now.

The following post will presume that you have already decided to go with a tankless water heater and are looking for the best one. We will attempt to answer the following question: What is the greatest tankless water heater?

The best tankless water heater

We looked nearly every tankless water heater on the market and our favorite is theRheem Performance 27 kw tankless electric water heater (5.6 GPM). Not only is it the greatest tankless electric water heater available, but it is also the best solution in general.

What we like

  • A corrosion-resistant component — One of the most common reasons that tankless water heaters fail is because “hard water” leads to corrosion in the components. Because there are no manufacturer warranties that cover this, it is critical to choose a water heater that is constructed of corrosion-resistant materials. And Rheem is known for making some of the greatest. The Rheem Performance tankless water heater is extremely energy efficient, which means that even at low intake temperatures, you’ll get a lot of GPMs out of a $500 water heater
  • High GPMs for a $500 water heater Good value—While Rheem’s tankless water heaters aren’t as inexpensive as EcoSmart’s models, they are still reasonably priced when compared to other manufacturers such as Stiebel, making them one of the finest value alternatives available.

Check out this page to discover more about tankless (on-demand) water heaters, including pricing, installation, and how to assess them: tankless (on-demand) water heaters. The Price of a Tankless Water Heater

Rheem vs. EcoSmart

Rheem Performance 27 kw and EcoSmart 27 kw are somewhat similar models in terms of features and performance. Both are widely regarded as the greatest tankless electric water heaters currently available on the market. However, there was one element that distinguished the Rheem from the EcoSmart: it was more corrosion resistant.

“Hard” water leads to corrosion

Many cities in the United States have water that contains minerals that can accumulate in a hot water heater and eventually damage the tank or other components. (By looking at this map, you can see how hard your water is.) All of Rheem’s tankless water heaters are constructed of corrosion-resistant metal, which means that they are less prone to leak as a result of the presence of “hard water.” EcoSmart’s tankless water heaters, on the other hand, are built of copper, which means they are susceptible to corrosion.

EcoSmart’s warranty doesn’t cover corrosion

“SUCH WARRANTIES DO NOT COVER: Product failure caused by liming, silt accumulation, chemical corrosion, chlorine/chloride corrosion, or freezing,” according to EcoSmart’s guarantee. As a result, the guarantee for EcoSmart does not cover the most likely method by which it will fail.

EcoSmart has bad customer service

The heating components of your EcoSmart may corrode, and if this occurs, customer care will inform you that you should have bathed them in vinegar every six months (which is quite the inconvenience). It is for this reason that EcoSmart’s goods receive a large number of negative evaluations on the internet, such as this recent Amazon review: “I wish I had never purchased this thing in the first place. During the course of nearly three years, I’ve had to replace the heater elements twice, each time incurring a cost of approximately $250 for the components ($85 for two elements) plus work for each occurrence.

They do, however, routinely obtain higher ratings than EcoSmart tankless water heaters, which are a close second.

Rheem vs. Stiebel

Among the companies claiming to provide the highest-quality products is Stiebel, a German business with headquarters in Berlin. We compared the Rheem Performance 27 kw to the Stiebel Eltron Tempra 24 Plus to see which was more efficient. The Stiebel tankless water heater costs $620, which is $115 more than the Rheem and $145 more than the EcoSmart tankless water heater.

The Stiebel Eltron Tempra, like the Rheem, is constructed of corrosion-resistant materials to provide long service life. As a result, it is a superior choice to the EcoSmart. But at a price increase of $115 we don’t think it’s worth it given that the quality is identical to the Rheem.

Best tankless gas water heater

Gas water heaters are not recommended for installation (see why below). However, if you absolutely must use a natural gas tankless water heater, we believe the Rheem Performance Platinum 8.4 GPMis the best option.

Why it’s the best option

  • An energy-saving function is included in the Rheem Performance Platinum, which may help you save up to 1,000 gallons of water each year. Energy efficiency—When compared to a regular gas water heater, Rheem’s tankless gas water heater has an Energy Star universal energy factor (UEF) of 0.93, which means it may save you $1,100 over the course of 12 years. (It’s important to note that this is far less than the $3,000-5,000 that a hybrid water heater may save.) High-quality product—Rheem is one of the oldest water heater manufacturers in the world, which means they’ve had a long time to iron out any flaws in their designs and manufacturing processes. They are well-known for producing high-quality items and providing excellent customer service.

Why we don’t recommend tankless gas water heaters

  • They’re really dangerous— Carbon monoxide (CO) and nitrogen dioxide (NO2) are produced by gas water heaters (NO2). Coal tar poisoning sends thousands of individuals to the hospital each year, and it claims the lives of hundreds of others. In addition, according to health experts, children who grow up in households with gas appliances are 40 percent more likely to develop asthma than children who do not. Gas prices are volatile and expected to grow in the near future— Natural gas prices can fluctuate by as much as 100% in a single year. Furthermore, the majority of analysts believe that prices will continue to climb over the next few decades. Electricity, on the other hand, is expected to grow more affordable. Natural gas is harmful to the environment since it releases CO2 and methane, which contributes to climate change. No2, another pollutant produced by gas appliances, makes the air dirtier and less healthful both outdoors and within dwellings
  • In addition, gas appliances emit NO2.

Heat pump water heaters are regarded to be the most energy-efficient water heaters available, and are thus the preferred choice for the majority of homes.

Learn more about water heaters

Throughout the years, we’ve written extensively on water heaters, covering topics ranging from tankless water heater installation to what we believe to be the greatest water heaters available: heat pump water heaters. If you still have questions, you may go to one of those guidelines, or if you’re interested in learning more about additional methods to improve the energy efficiency of your house, you can refer to our guides on heat pumps and LED lighting.

The Best Tankless Water Heaters for Your Money

There’s nothing more frustrating than getting into the shower only to discover that there’s no hot water left. If you have a tankless water heater in your house, it may be possible to eliminate this hassle by supplying hot water instantaneously once a faucet is opened. Tankless water heaters are also more compact, energy efficient, and have longer lifespans than water heaters that use a large storage tank as a storage vessel. Typical tank water heaters have a storage capacity of between 20 and 80 gallons of hot water, with 50 gallons being the most common configuration.

In general, a shower consumes around two gallons of water every minute, thus a 10-minute shower would consume 20 gallons of water.

A residence with a conventional 50-gallon water tank might have 80 percent of its capacity depleted in a matter of minutes if the tank was completely depleted during the storm.

In contrast, tankless water heaters detect when a faucet is opened and heat the water on demand using either electric or gas power to keep the faucet running.

Tankless vs. tank water heaters

There are several advantages to using a tankless water heater that are not restricted to the volume of hot water it can deliver. For the purpose of keeping the stored water warm, tank heaters are always operating. Because a tankless water heater only functions when there is a demand for hot water, the device stays inactive at all other times of the day. According to the United States Department of Energy, this increases their energy efficiency by between 24 and 34 percent. Tankless heaters are also substantially smaller than traditional heaters.

  1. A tank water heater with a 50-gallon storage capacity, on the other hand, can reach heights of more than 6′ and diameters of more than 20″.
  2. Tankless units have a lifespan of more than 20 years, whereas tank units have a lifespan of 10 to 15 years.
  3. Tankless water heaters may cost upwards of $2,000, whilst a tank water heater might cost between $400 and $600.
  4. The overall heating capacity of a tankless device is also dependent on the temperature of the groundwater in your location.
  5. As a result, a tankless heater that meets the demands of your home throughout the warmer months of the year may fall short when the temperatures drop.

Consider all of this while considering whether to go with a tankless or a traditional water heater — or when determining which tankless water heater is best for your particular situation.

Tankless water heater buying guide

In order to determine which tankless water heater will best meet your household’s needs, you must first determine how much hot water will be consumed during peak usage, followed by the anticipated “temperature rise” requirement, which is the amount of time the incoming water must be heated in order to reach the desired temperature. The type of fuel that a heater burns is particularly essential since it impacts the heating capacity of the unit, as well as the expenses of installation and maintenance of the device.

  • The gallons per minute (GPM), often known as the water flow rate, is a measurement of how many gallons come out of a faucet in one minute.
  • It is necessary to consider how many appliances or faucets are regularly in use at the same time in order to do this.
  • Having a heater that can handle at least 8 GPM would be necessary if you wanted to take two hot showers and run the dishwasher at the same time.
  • The temperature is rising.
  • A water heater that can raise the temperature of incoming water by at least 40 degrees Celsius is required if you live in a region where the groundwater is 60 degrees and want it to be heated up to 100 degrees.
  • In colder areas, less hot water will be provided since the unit will struggle to raise the temperature of the water.
  • The GPM capacity of a heater, which is determined by the needed temperature rise, is often included in the owner’s handbook or product specification sheet provided by the manufacturer.
See also:  How To Install Heat Pump Water Heater

The sort of fuel.

Tankless water heaters fuelled by natural gas offer a greater heating capability than electric water heaters.

As previously stated, a high GPM is required not just for large homes, but also for colder areas.

They do, however, necessitate a greater initial financial outlay.

Electric tankless heaters, on the other hand, offer significantly reduced initial installation expenses.

They are also more energy efficient than gas-powered heaters (by as much as 5 percent or more), and their installation and annual maintenance are easier and less expensive than those of gas-powered heaters.

Their total GPM might reduce significantly in cold weather due to the fact that they have a lesser heating capacity than their gas-powered competitors.

When groundwater temperatures reach 60° or higher, an electric heater with a flow rate of 6 GPM may be more than adequate. However, if the groundwater temperature drops to 40° or below, its capacity may be reduced to only 2 GPM or less.

Best tankless water heaters

The Rinnai RUR160iN, which runs on natural gas, is designed to be as efficient as possible. Because it is a condensing tankless water heater, it catches and reuses exhaust gas, allowing it to take full use of the heat it generates, earning it the Energy Star certification for efficiency and performance. The second someone opens a faucet, tankless water heaters begin heating the water; but, hot water may take some time to reach fixtures that are positioned far away from the heater. Water is wasted in the majority of situations because you are allowing it to flow while you wait for it to heat up.

  1. The RUR160iN is also equipped with certain cutting-edge technical features.
  2. The heater reacts to voice instructions from Amazon’s Alexa or Google’s Google Home.
  3. The RUR160iN (which retails for around $1,800) is a natural gas-powered water heater that can provide up to 9 GPM of hot water.
  4. A greater GPM, on the other hand, is advised for houses with more than four occupants.
  5. Take a look at theRUR160iPorRUR199iP if you live in a home with propane lines.

2. Editor’s pick:Rinnai RU130iN

Also from the Rinnai brand, this Energy Star-certified heater is designed to catch and repurpose exhaust gas in order to maximize energy efficiency and reduce operating costs. Operating it at a rate of around 4 GPM will cost you only about $133 per year. Keep in mind, however, that keeping the heater’s capacity at 4 GPM or below is merely a guideline for efficiency. In fact, the RU130iN can heat up to 7 GPM of water, which is enough to run two low-flow showers and the dishwasher at the same time in hotter climates.

While the RUR130iN does not come equipped with Wi-Fi capabilities out of the box, you may upgrade your system by purchasing the Control R Wi-Fi Module ($120).

In addition, you might use the app to start the heater’s recirculation function (provided you install an external pump).

Although this model is powered by natural gas, the RU series also includes units that are powered by propane. If your home need more hot water than that, there are versions from the same series that can deliver 9, 10, and even 11 GPM of hot water.

3. Best for low prices:EcoSmart Eco 18 Electric Tankless Water Heater

The EcoSmart Eco 18 water heater, which sells for $400 or less, is strong enough to heat up to 4.3 GPM of water, which is plenty for a family of two in warmer climes. In addition, it can provide hot water for a single shower at a time in locations where groundwater temperatures are as low as 52 degrees. This electric tankless heater will not significantly increase your power cost. It maintains a constant level of energy usage throughout the day. According to the fixture being used, a flow sensor measures how much water needs to be heated at any one moment and adjusts the system to utilize just the amount of energy necessary to satisfy the demand and maintain the target temperature.

Please keep in mind that its 4 GPM capacity may not be sufficient for families with more than two persons, or for households in extremely cold environments.

4. Best electric tankless water heater:Rheem RTEX-24

Despite the fact that gas-powered tankless heaters are often less expensive to operate than their electric equivalents, they might be more expensive to install. Additionally, not all residences are equipped with gas lines and ventilation systems. It’s possible that an electric water heater will be the best option for you in this case. Electric water heaters from Rheem are well-known for their long life, great efficiency, and large storage capacity. For example, the RTEX-24 can generate up to 6 GPM, which is sufficient for a family of up to four people.

The RTEX-24 has a 99.8 percent energy efficiency rating, which is exceptional.

Tankless water heaters that do not use condensing technology are only approximately 80% efficient.

In order to conserve energy, it detects the flow needs of running faucets and adjusts its power output to consume just the amount of energy necessary at the time.

5. Best point-of-use heater:Bosch Tronic 3000

Water heaters, whether gas or electric, are often situated in the basement or utility room of a house and provide hot water to all of the faucets and appliances in the house. Water heaters situated at a specific water source, whether it’s a showerhead or a sink, are called point-of-use heaters since they exclusively heat the water at that location. If you already have a central water heating system, you might think that this is superfluous. However, it is possible that hot water will take up to 10 seconds or more to reach all areas of the house.

The Bosch Tronic 3000 may be disguised under a sink, within a cabinet, or in any other area that is out of sight of the public (as long as its supply line reaches its target faucet).

This decreases the length of time people have to wait and the quantity of water that is wasted.

Others use it in outdoor restrooms or barns, among other places. Another advantage of this sort of heater is that it does not necessitate the use of a professional installer. You can just connect the machine into a typical 120v wall outlet and you’ll be set to go.

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Best Tankless Water Heaters in 2022 – Review by Old House Journal

We were able to select the most appropriate tankless water heater for the normal demands of the ordinary individual in our study. However, because there are hundreds of various types and sizes available, you will need to consider a few important considerations before making your final decision on which tankless hot water heating unit or system to purchase.

What should a person know before they purchase a tankless water heater?

Before you even consider purchasing a tankless water heater, it is critical to examine the following factors:

  • The sort of fuel that will be used to power the water heater
  • Each unit’s mounting position, size, and water flow rate are all different. Indication of the function for which the water heater will be utilized

Our guide to tankless water heaters is provided below. This article will quickly describe how a tankless water heater works, what you should know before purchasing one, and the many operational aspects of the units, allowing you to make an educated decision about your water heating needs.

What are the different types of tankless water heaters?

If you opt to go with an electric tankless water heater, make sure you thoroughly research the amperage, voltage, and circuit breaker requirements before making a purchase. The majority of the gadgets will operate between 110V and 277V; each model has its own set of specifications. As a result, be certain that the water heater you choose is compatible with your home’s electrical system. Inspect your electrical system to ensure that a circuit is available to accommodate the tankless water heater.


If, on the other hand, you opt to acquire a gas-fired water heater, there are a few factors to consider, such as the type of gas used in your home – propane or natural gas – and the amount of venting required. It is necessary to check the gas line to guarantee that it will meet the criteria of your fresh new gas-fueled tankless water heater.

How to choose a water heater with the right flow rate?

It is critical that you select a water heater whose flow rate is compatible with the flow rate of the faucets in your house. Each product has its own temperature and flow rate specifications. If the water does not heat up sufficiently, or if the flow rate is either too low or too high, the heater will not perform as intended. The demand for water in a shower may be 4 gallons per minute whereas the demand for water in a dishwasher might be just 1.5 gallons per minute while the temperature is at 100 degrees.

Also, it’s never a bad idea to address these issues with your plumber and get a second view just in case something goes wrong.

How do you go about the maintenance chore for a tankless water heater?

Maintaining your tankless water heater on a regular basis is essential if you want it to last as long as possible. In an ideal situation, you should schedule a maintenance appointment at least twice each year. A few pointers regarding how you may make sure your heater lasts season after season should also be available on the internet, if you look hard enough.

Furthermore, most manufacturers give their customers with a repair/maintenance guarantee in the event that something should go wrong. And the majority of the time, they do! As a result, make certain that all of the loose ends are tied up.

What are the benefits of tankless water heaters?

A hot water system that is based on a basic tank can only supply as much hot water as the tank is capable of storing in its capacity. And, because your heater is only as good as the size of your tank, you’ll be running out of hot water on a consistent basis. Because the tankless system warms water just when it is needed, you will always have hot water on demand, wherever you are and whenever you want it!

Reduced energy bill fees

Tankless water heaters are more expensive than typical tank water heaters, but they have the potential to save you money on your power costs. Tank heaters maintain a constant temperature of the water, even while you are not using it. The tankless technology, on the other hand, only warms the water when it is needed, allowing these small appliances to be more energy-efficient than traditional models.

Compact designs

While a traditional tank system takes up a large amount of space, a tankless system may be installed in a corner of your bathroom or even beneath your kitchen sink for maximum convenience. They are available in both wall-mounted and floor-mounted configurations. Therefore, they are really useful in this regard.

The Best Electric Tankless Water Heaters in 2021 – Review by Woodsmith

Despite the fact that tankless water heaters may not appear to be all that different at first glance, if you want to have hot water at home, you need think about what you want to do with your future water heater.

Things to consider before buying a tankless water heater

Tankless water heaters are not all the same size, and some are larger than others. In reality, the size of a water heater is mostly determined by the internal circuits and systems that are present within the appliance. Some may be able to fit within your tiny shower room, while others may demand you to install them in a more open space, depending on the manufacturer.


Beyond the size of the heater, you’ll also want to consider the form of the heater itself. Water heaters are typically rectangular in design, which makes them easy to place on a bathroom wall or beside a sink, which is where they are most usually seen in homes. Some heaters, on the other hand, are formed differently as a result of the existence of additional components, such as a small tank. When selecting whether or not to purchase a heater, think about where you want to put it.

See also:  How To Fix Water Heater Leak


Water heaters are designed to do one thing only: heat water. However, it does not rule out the possibility of their performing additional functions. Water heaters with digital thermostats provide a more precise indication of the temperature, and some models even have a self-modulating mechanism that ensures that the water is always at the proper temperature. These options aren’t absolutely required, but they can come in helpful on a variety of circumstances.


Water heaters are not always portable; however, some are meant to be, and you may desire the option of transporting your water heater with you when traveling or if you want to use it in more than one area.

These sorts of heaters, on the other hand, are typically powered by natural gas or propane, so use caution when using them.

Tankless water heater price ranges

Tankless water heaters are reasonably priced, with some costing as low as $100. Despite their low cost, these water heaters are capable of being fitted with sophisticated thermostats and touch controls. The price of certain devices starts at $200 and may go up to $300 if they have extra capabilities such as self-modulation. The most costly water heaters can cost as much as $400 per unit, depending on the model. Generally speaking, the price of tankless water heaters varies from one manufacturer to the next, although there are exceptions.

How we choose the best canopy tents

Tankless water heaters are selected based on the fuel that drives them, the energy efficiency of the unit, the amenities that come with the unit, and user evaluations.

The Best Tankless Water Heaters for Hot Showers Galore

Learn more about our methodology, which includes independent investigation, testing, and assessment of the top goods before making recommendations. If you make a purchase after clicking on one of our links, we may receive a commission. Chloe Jeong’s novel The Spruce Compared to many traditional water heaters, tankless water heaters reduce space while also providing improved energy efficiency. Best of all, because there is no storage tank to empty, this type of water heater never runs out of hot water!

  • Look for a tankless water heater that meets your demands in terms of hot water output per gallon (GPM).
  • Add up the GPM flow rates of each fixture to estimate peak water consumption requirements, and then seek for a tankless water heater that meets those requirements.
  • A natural gas tankless water heater is a cost-effective approach to ensure that you always have hot water available on demand.
  • Natural gas tankless water heaters, in general, provide quicker flow rates than electric tankless water heaters, making them a suitable choice if you already have a gas water heater in your home.
  • The Rinnai RL75i provides 7.5 GPM of hot water and may supply hot water to up to four separate fixtures at the same time, depending on the temperature of the entering groundwater.
  • This model is also fitted to take use of Rianni’s Circ-Logic recirculation technology, which optimizes the energy consumption of the tank’s recirculation pump.
  • The most straightforward (and most cost-effective) option when replacing a standard electric water heater is often to go for an electric tankless water heater instead.

Using the knob, you can control the temperature of entering water by one degree between 80 and 140 degrees.

Despite the fact that it is modest in size, being just 18 inches tall by 21 inches long, most people do not miss their enormous, heavy tank water heater.

As a result of the higher initial investment required for tankless water heaters compared to traditional water heaters, the EcoSmart Eco 18 is a more inexpensive tankless model that helps to reduce the price gap that exists between tank and tankless water heaters.

It is equipped with digital controls that make it simple to adjust the desired temperature for the drinking water.

In exchange for its tiny size and low price, it has a restricted capacity—truly it’s only powerful enough to operate as a whole-house tankless water heater in places where the incoming water temperature is 62 degrees Fahrenheit or higher.

It can be used to supplement the supply from a bigger whole-house tankless water heater or a conventional water heater that is located a long distance away from where the sink is.

Despite the fact that it is only intended to support a single sink, it provides hot water on demand and does not waste energy heating and storing water for later usage.

You’ll pay more for a condensing tankless water heater, but these types work even harder to gather energy and increase efficiency than standard ones.

This EnergyStar-certified natural gas tankless water heater also saves energy by trapping heat from the exhaust produced by employing a secondary heat exchanger, which reduces the amount of energy used.

One thing to keep in mind is that finding a service expert who is knowledgeable in troubleshooting and repairing this particular model of water heater might be difficult.

While not the most energy-efficient tankless water heaters available, they do represent a significant portion of the total market share.

The EcoSmart ECO 11 is a wonderful choice if you just need to operate one or two water fixtures at a time, such as a sink and a shower, as this model is designed to do.

This tankless water heater can fulfill the demands of most modest houses in warm weather climates by giving hot, steaming water to a bathroom sink as well as to a shower all at the same time.

Because most water heaters are hidden away in utility closets or put in basements, this is a sensible choice because these equipment are more effective and efficient when they are not subjected to the draining effects of cold weather as well.

The Rinnai Value Outdoor Natural Gas Tankless Water Heater, on the other hand, is a 5.6 GPM model that is built for outdoor installation and hence takes up less room inside your home than a tankless water heater.

It has the capability of supporting up to two showers at the same time.

This device from Camplux attaches to a propane tank and can provide up to 1.32 GPM of hot water for showers, cooking, and handwashing, depending on the configuration.

The Camplux Portable Tankless Water Heater comes with a gas regulator as well as a showerhead, making set-up a breeze. Make sure that you have a minimum water pressure of 3.0 PSI in order to utilize this portable tankless water heater efficiently.

The Best Tankless Water Heaters of 2022

  • Stiebel Eltron Tempra 36 Plus
  • Rinnai Sensei RU160iN
  • EcoSmart ECO 36
  • Rinnai RL94eN
  • Rheem RTEX-13
  • Camplux 10L 2.64 GPM Portable Propane Water Heater
  • Stiebel Eltron Tempra 36 Plus
  • Rheem

Meet the tester

Jean Levasseur is a contributor to this work. A decade-long career in marketing, public relations, and technical writing prepared Jean Levasseur for her current position as a professional writer. Jean has continued to write in a variety of freelance capacities after quitting that employment to remain at home with his twin sons. He also teaches academic writing at a local university, which he loves. When he isn’t reviewing products or chasing children around the home, he is an ardent fiction writer and a budding carpenter who spends his spare time building furniture.

Checking our work.

Our crew is dedicated to one goal: assisting you in purchasing the greatest products and enjoying what you already have. The goods we cover are closely scrutinized by our writers, editors, and lab professionals so that you can make an informed purchasing decision. Do you have a different point of view on anything we’ve recommended? Send us an email and we’ll share notes. Send us a message via email.

The Best Tankless Water Heaters

Every product we evaluate is chosen by our gear-obsessed editors. If you make a purchase after clicking on one of our links, we may receive a commission. How we put our gear through its paces. In appearance, a tankless water heater seems to be nothing more than a plain gray box that is mounted on the wall. However, the engineering that goes into that box is rather impressive, because when you turn on a hot-water faucet, it produces sumptuous amounts of hot water while remaining reasonably energy efficient.

  1. Continue reading for an explanation of how these appliances function, useful purchase suggestions, and in-depth evaluations of each model.
  2. Amazon.com offers the Rinnai V65e.
  3. Semi-Tankless The Bosch ES4 Tronic 3000 is tucked away behind a sink.
  4. Takagi T-H3-DV-NInstalls in a controlled environment.

How They Work

Open a faucet in your house, and cold water enters the appliance, triggering a flow sensor, which then activates the appliance. In the case of electrical equipment, this initiates the circuit, which then energizes a heating element, which immediately heats the water. In the case of gas appliances, it activates the igniter and opens the gas valve. The water is heated when it comes into touch with the hot metal surface of the heat exchanger, which is created by a burner inside the heat exchanger.

  1. The colder the incoming water is, the more difficult it is for the appliance to function.
  2. After all of that, you’ll have plenty of warm water to drink, and you may drink as much as you like.
  3. When compared to a conventional tank type appliance, the energy savings can be significant, possibly as much as 24 to 34 percent yearly (according to research conducted by the United States Department of Energy).
  4. In general, the appliances are more expensive to purchase, install, and maintain than a traditional tank-type water heater, both in terms of initial cost and ongoing costs.
  5. Nonetheless, tankless water heaters have two benefits: the luxury of having as much hot water as you need (and as soon) and the space savings resulting from their compact size and placement on a wall rather than the floor.
  6. If you plan on taking use of all that hot water capacity by taking long, steamy showers, you’ll need to make sure your bathroom is properly vented (of course, increased bath fan use or a larger bath fan will reduce your energy savings).

When you install a tankless water heater on the wall, you free up more space on the floor that can be used for other purposes. Courtesy

Picking a Tankless Water Heater

Tankless water heaters can be installed by some persons who are mechanically skilled, but the most majority are installed by a qualified expert, generally a plumber. When a piece of equipment is not installed properly, some manufacturers will void the guarantee on that piece of equipment. Before you purchase an appliance, consult with the technician who will be installing it to ensure that you have selected the suitable size for the device. Consider the most significant need that the appliance will be required to satisfy on a regular basis (i.e.

  1. Next, assess if the appliance has the capability of heating the incoming water sufficiently (a process known as temperature rise) to satisfy the demand.
  2. And, as for the choice between a fuel-burning water heater and an electric water heater, if you’re replacing a tank water heater, you’ll most likely choose the same energy source.
  3. Tankless water heaters can be put on the outside of a home wall in warm areas; however, building standards dictate where they can be installed in relation to the eaves and whether or not they can be installed near a window or door.
  4. Furthermore, many tankless devices may be operated remotely with the use of an app.
  5. You may either remove the appliance from the “vacation” mode ahead of time and use it to heat up a shower when you arrive, or you can remotely turn it off and on again.

How We Selected

It was important to us to provide you with a representative sample of these appliances in terms of physical size, price, capacity, energy source and mechanical characteristics—such as mineral scale sensors or the possibility to be linked with other tankless heaters. This was accomplished via the use of our previous coverage and testing of home appliances to determine which heaters would be the most suitable for your requirements. Both natural gas and propane-fueled vehicles and electric-powered vehicles were taken into consideration.

Rinnai V65IN

Propane is used as the fuel, and the location is indoorV65INRinnaiamazon.com. $1,060.00 The V65IN is a mid-priced appliance that is ideal for tiny or mobile homes. According to the manufacturer, it is capable of feeding up to five separate fixtures at the same time. It is possible that the appliance will be able to offer up to 6.5 gallons of hot water per minute during warm weather, assuming that the supply water is at its ideal temperature.

In addition, a convenient function that detects scale building would shut down the appliance rather than risk overheating damage caused by a buildup of mineral deposits in the appliance.

Rheem RTG-84DVP

Propane is used as a fuel, and the location is indoorRTG-84DVPRheem. $1,555.27$1,209.23 $1,555.27$1,209.23 (22 percent off) It is a high-efficiency appliance built for rural and suburban households that uses propane as a fuel source. A second heat exchanger, which draws heat from the exhaust gas, allows this Rheem to capture every last ounce of heat energy possible (a condensing appliance, in other words). It has the capability of producing up to 8.4 gallons of hot water per minute when operating at ideal water temperature settings.

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Bosch ES4 Tronic 3000

The power is 120 volts and the location is indoor. Isn’t there a bathroom sink in your house that’s the furthest away from the heater and never seems to receive hot water? Here’s what I’ve come up with: The Bosch ES4 tankless water heater is not your usual tankless water heater; it is small enough to fit under a counter or within a cabinet and plugs into a conventional wall socket to supply all of the hot water that a sink requires. It may also be put in line to supplement a separate tankless water heater, alleviating some of the load on the tankless water heater.

AO Smith ATO-310-P

Propane is used as a fuel and the location is outdoors. Despite the fact that you have a lakeside vacation home, you are frustrated by the inability to take a proper shower following a day of water skiing or mountain biking. This 38-pound tankless heater will do the job, especially when you consider its impressive performance, which includes the ability to provide approximately nine gallons of warm water per minute. Don’t have access to a cabin? The appliance is also effective in the suburbs.

It has the capability of supplying water to two fixtures at the same time, and a temperature remote control may be put indoors (in a closet, if you like, to protect your children from messing with it) to allow you to alter the temperature of the water.

Takagi T-H3-DV-N

Natural gas is used as the fuel and the location is inside. This condensing high-efficiency tankless water heater from Takagi is one of the most cost-effective and energy-efficient tankless water heaters on the market today. It is also physically compact and lightweight, weighing only 58 pounds. Even in the unlikely event that you require more capacity than this appliance can provide (which is highly unlikely given its efficiency and ability to supply up to 10 gallons of heated water per minute), it is designed from the factory to be linked to up to three additional heaters without the need for complicated accessories or parts kits.

Rheem RTEX-18

Electricity: 240 volts | Location: an enclosed space A 240-volt tankless water heater is the ideal answer for many homeowners who do not have natural gas service at their residence and for whom propane is unsuitable for a variety of reasons. Due to the fact that this Rheem appliance weighs just 8.5 pounds and is about the size of two laptops placed on top of each other, it can be put on a tiny wall space and wired in an inconspicuous manner using size eight AWG wire (and two 40-amp circuit breakers).

Its self-modulation technology senses water flow and automatically changes its power output to match demand, resulting in significant energy savings.

Rinnai V65eN

Natural gas | Outdoor installationV65eNRinnai$1,054.00$757.49 (28 percent off)Space is at a premium in your home, and you want to make the most of the opportunity to get rid of the old water heater that’s been relegated to a corner of the utility closet. Consequently, you hire a plumber to put the V65eN on an outside wall, so freeing up closet space, lowering your gas cost, and providing more hot water for your money. Not too shabby for a day’s effort. Other characteristics of this low-cost appliance, like as its 6.6 gallon capacity, make it intriguing, as does its low price.

Rinnai recommends it as suited for households with a single or 1.5 bathrooms.

Tankless Water Heaters Reviews

Tankless water heaters review and purchasing guide – pros and disadvantages, benefits, top features, best brands, and models. Tankless water heaters are becoming increasingly popular. Consider the following to avoid potential difficulties as well as time-consuming and expensive troubleshooting. In your search for home tankless water heaters, also known as on-demand and instant hot water heaters, it’s crucial to keep in mind that the tankless system and heating process are fundamentally different from those of traditional tank-type water heaters.

Get Quotes from Highly Qualified Water Heater Professionals!

There is a lot to learn about tankless water heaters.

If you are interested in purchasing Rinnai, Noritz, Rheem, Navien, Stiebel Eltron, Eemax, Rheem, or any other top models, go toamazon.com to find them.


  • Top reasons to buy a tankless water heater
  • Types
  • How a tankless water heater works Tankless fundamentals
  • Manufacturers
  • Pros and cons
  • And more are covered in this video.

Top reasons to buy tankless

The key advantages of the finest tankless water heaters are their tankless design, which allows for on-demand hot water, continuous flow, and an inexhaustible supply of hot water, among other features. Tankless heaters are characterized by their low energy usage (up to a 50% decrease when compared to tank-type heaters), small and compact design, replaceable components, and condensing technology, among other features. ThisRinnaimodel serves as an excellent example since it incorporates high-quality features that result in greater efficiency, high performance, energy and pollution reduction, and – most importantly – cost-effectiveness.

Tankless water heaters can be powered by either natural gas or electricity.

According to demand, house size, and family size, the size of the unit you require should be determined by consulting the sizing guide.

As a result, the vast majority of these tankless hot water heaters are whole-house models, which offer a greater GPM flow rate for high hot water demand and the ability to serve several applications at the same time.

Some manufacturers provide versions that combine water heating with space heating, providing consumers with even more alternatives and opportunities to save money. Combi boilers, such as this Navien, are what are known as in this industry.

Buy the Best of Rinnai

With their compact and modest form, Titan electric electric tankless hot water heaters may be mounted on the wall or installed under the sink, saving you a significant amount of floor space. Because they are less susceptible to hard water and sediment deposits, they have a longer service life. There are two sorts of products available for purchase: point-of-use and whole-house. When compared to gas tankless water heaters, electric tankless water heaters do not require venting and do not emit greenhouse gases into the atmosphere.

  • Environmentally friendly models are the EcoSmart ECO 27, Stiebel Eltron Tempra 24, and Rheem RTE 13.


Bosch gas tankless hot water heaters are also considered to be ecologically beneficial products. Many of them make use of cutting-edge technology to improve energy efficiency while still adhering to tight emission rules. They have the option of using natural gas or propane – LP. Gas tankless water heaters have higher flow rates than electric tankless water heaters.Tankless hot water heaters can be further divided into two categories: those that can only be turned on and off (older models) and those that can be turned on and off and modulated (those that use a modulating gas valve).Hot water heaters with modulation adjust their heat output in response to the amount of water flowing through them.

The best gas tankless models are those that use condensing technology – where the “hidden” gas flue energy is used for preheating and superior efficiency – Rinnai RUC98is an excellent example – energy factor is ultra-high, 0.96, and due to its ultra-low NOx emission is great on the environment.The top three selling brands on Amazon.com are: Rinnai, Whirlpool, and Whirlpool.

How tankless works

It is important to understand how tankless water heaters function after learning how they work (picture courtesy of Takagi). Because these models are more sophisticated than ordinary cylinder kinds, additional knowledge and skills are necessary before installing or maintaining them. This is especially true when it comes to gas-powered machines, as previously stated.

How electric tankless type works

Electric tankless heaters make use of a heating element that is regulated by a flow-sensing mechanism that runs with a continuous heat input and the greatest flow rate possible. In order for the maximum flow to be requested, the pressure must be changed on the knob. If the maximum flow is requested, the outgoing water toward the hot water tap will be colder since it will have spent less time travelling through the heat exchanger.

How gas type works

Modern gas-powered tankless versions make use of the most up-to-date technology, with the output temperature, flow rate, safety, and other factors being controlled and regulated by an electronic circuit board or a tiny computer, as is the case with traditional tankless models. Rinnai, Noritz, Takagi, and Paloma are all excellent instances of this. An electrical module receives a signal from the flow sensor in the tankless water heater when you turn on the hot water faucet. The signal is then sent to the gas valve, which opens the flow of gas as a result of the signal.

The gas is ignited by either a pilot flame (on older versions) or a spark from the electrode (on more recent models).

The heat exchanger is responsible for transferring heat from the burner to the water heating system in real time.

As soon as the faucet is turned off, the flow of water ceases and the flame is extinguished.

The foregoing explanation demonstrates that tankless water heaters heat water on demand while also supplying you with an infinite supply of hot water. These types are mostly positioned on the wall, allowing for more utilization of the available floor space.

Video: Tankless basics

Here is a list of the most common home tankless hot water heaters in the United States and Canada, where many gas-type units are Energy Star rated; some brands are inexpensive, while others, which are more sophisticated, are more costly; certain models are available in both countries.


  • There is an endless supply of hot water. Have you run out of water? Never
  • Durable, with a lifespan of 20 years or more (in some cases). It is possible to save up to 50% on your energy and heating expenses. There are high-efficiency heaters available that are labeled with the Energy Star logo. Installation solutions that are flexible can be fitted anywhere, inside or outside the house
  • Reduce the amount of greenhouse gases released
  • The rating for dependability is 99.9 percent
  • There will be no scorching injuries. This device provides you with clean and fresh hot water
  • Because there is no tank, there are no leakage difficulties. The self-diagnostic software (which is useful for troubleshooting and repairs) and precise temperature control are features of some models, which improves safety and comfort while also increasing safety and comfort. Homeowners who purchase modern and energy-efficient models can take advantage of government tax credits, rebates, and other incentives. Natural gas or propane (LP) is used to power the vehicle. All of the components are interchangeable.


  • Tankless systems can be up to three times as expensive as tank-type heaters due to the high up-front expenditures associated with them. Upgrades such as a venting system or a gas line are too expensive. Due to the way hot water is distributed throughout all of the home fixtures, the water temperature is erratic, temperature fluctuations occur, and a “cold-water sandwich” occurs. This pertains to units of the economic variety. Units that vent gas or propane require pricey stainless steel tubing
  • However, several brands employ alternative materials instead of stainless steel. Electric quick water heaters may necessitate the use of an additional circuit as well as a significant amount of electricity. Water heaters powered by natural gas demand additional fees for yearly maintenance. The heat exchanger in instant water heaters must have a minimum flow rate in order to operate. A robust plumbing system is essential for tankless water heaters since they rely on the pressure provided to your home
  • Therefore, you must have a strong plumbing system.

Taking everything into consideration, it can be concluded that purchasing a tankless water heater is a wise decision and a sound long-term investment. To conclude, with a tankless water heater, you can say goodbye to running out of hot water, sediment build-up, bacteria build-up and rotten egg odor, discolored water, long recoveries, installation space concerns, energy waste, wasteful energy consumption when hot water is not needed, limited life, and so on.

Related articles

  • Get assistance with your tankless water heaters from professionals in your area. Troubleshooting tankless water heaters
  • Evaluating and comparing tankless water heaters How to winterize a tankless water heater
  • Tankless installation
  • Benefits
  • Tankless upkeep
  • Tankless vs. tank-type installations

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