Best Tankless Water Heater Reviews 2022

Everyone has been through it. You go to turn on a hot shower after a long, cold day and, unfortunately, there’s no hot water left! With one of our highly-rated tankless water heaters, you’ll always have hot water available whenever you want it. We’ve chosen five of the best tankless water heater brands known for producing high-quality products, featuring one of their models to give you an idea of what they have to offer.
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Power Source
Flow Rate
Our Top Choice
Rinnai RUC98iN Natural Gas Tankless Water Heater
With 100 years’ experience, Rinnai is a trusted, innovative leader in home and commercial gas appliances. The RUC98iN Tankless Water Heater is both eco-friendly and money savvy.
.96 Energy factor. Space saving design. Low nitrogen oxide emissions. 199,000 max BTU.
Slightly higher cost. Reported problems with ignition.
9.8 GPM
199,000 BTU
Best Value
Stiebel Eltron Tempra 24 Tankless Water Heater
For 90 years Stiebel Eltron have been manufacturing quality heating appliances for your home. They pride themselves on making superior products which is evident in the Tempra 24 Tankless Water Heater.
No venting. Sleek design. Save at least 15% on hot water. If you need reliability and affordability, this could be the heater for you.
Reported issues with thermal switch.
ANSI/UL certified
Max : N/A, Min: 0.5 GPM
82,000 BTU
Rheem Indoor Direct Vent Tankless Water Heater
Rheem has been around since 1925, standing the test of time and producing quality products. Their Direct Vent Water Heater provides instant hot water at anytime, anywhere in the house.
94 percent energy efficient. Electronic controls for both safety and performance. Low emission. Supports 38 feet of three inch PVC pipe.
High cost. Some problems with gas inlet connectors have been reported.
ENERGY STAR® certified
Natural Gas
Min: 0.4 GPM, Max: 9.5 GPM
199, 900 BTU
Takagi Natural Gas Indoor Tankless Water Heater
Takagi has manufactured energy-efficient solutions for water heating for 60 years. This Indoor Tankless Water Heater is affordale, reliable and will provide enough power to heat water for the whole family.
140,000 BTU. 6.6 GPM maximum flow rate.
Average energy rating (.81). Warranty only valid if installed by technician.
ENERGY STAR certified
Natural Gas, Electric
6.6 GPM
140,000 BTU
BOSCH Point-Of-Use Mini Tank Water Heater
Bosch is a multi-national company that’s been around for 100 years, so they know a thing or two about what they’re doing. Their Mini-Tank Water Heater is one of the most compact water heaters money can buy.
Easy to install whether in trailers, apartments or your home. Fast and easy installation. Shelf, wall or floor mounted. Fast recovery rate.
This is an under the sink water heater only.
Not stated
6.8 GPH
Not stated

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What is the Best Tankless Water Heater?

In today’s world where energy costs are as volatile as New York Yankees legend and former coach, Billy Martin, the best tankless water heater is one that can save energy. Apart from meeting this minimum requirement, it should also serve its purpose: producing hot water whenever you need it. Given that you’re well-aware of the elements you need to consider when buying the best tankless water heater, let’s move on to our selected items, confident that you’ll see one that meets your needs.
Our Top Choice
With a maximum BTU of 199,000, the Rinnai RUC98iN Water Heater is powerful enough to provide instant hot water to most families. However, an indoor water heater may not be for you. Luckily, Rinnai also has outdoor water heaters available.

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater with Concentric/Twin Pipe Installation

Being one of the largest gas home appliance companies, specializing in tankless water heaters, it’s no surprise Rinnai has made it to the top of our list. Their philosophy is technology, teamwork and innovation which shows in their high end, yet cost efficient, appliances. Rinnai’s most popular tankless water heater is the RUC98iN, which is one of the reasons this particular product made it as Top Choice.

The RUC98iN didn’t just coast into being Rinnai’s best seller; there’s a whole bunch of excellent features making it their number 1.
  • Concentric and PVC venting option
  • Up to .96 energy factor
  • Space-saving design
  • 199,000 max BTU
  • ENERGY STAR®, AHRI, CSA certified
  • Limited warranty up to 12 years
Overall, this tankless water heater is a great choice, packed full of features. Rinnai is highly reviewed on Amazon and other review websites, and tankless water heaters are their specialty. If this isn’t exactly what you’re looking for, but the features have tickled your fancy, Rinnai has other size and type options available in the same Ultra Series line.
Best Value
With an impressive 24kW, the Stiebel Tempra 24 Plus offers enough power for most homes. Looking for something a little more powerful? Stiebel offer a larger 28.8kW Tankless Water Heater with the same great features and no compromising on quality.

Stiebel Eltron Tempra 24 Plus Electric Tankless Whole House Water Heater, 240 V, 24 kW

Stiebel-Eltron is one of the top names in home and commercial appliances and technology. This fantastic tankless water heater is definitely a credit to that name with many innovative features.
  • 3 year warranty
  • Tempra Advanced Control Flow
  • Hinged Cover
  • Digital temperature control
  • No venting required
  • Certified- so you know you’re getting a quality product
  • Savings of at least 15-20% off your hot water electricity bill
The unique Tempra Advanced Control Flow allows multiple users to enjoy unlimited hot water, even if the flow of water becomes too much for the system to handle. You will never have to worry about a cold surprise with this heater.
The cream of the crop, this model is designed for indoor use and can be run using either natural gas or electric power. If you are looking for a Rheem tankless water heater for outdoors, or a cheaper alternative, this may be the option for you.

Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater

Rheem produces some of the best tankless water heaters. This high tier model is no exception. This model includes what Rheem calls “intelligent electronic controls”. This feature alone makes the unit worth the cost. These controls ensure that your unit runs efficiently, and contains self diagnostic software that informs the user of malfunctions, or errors during installation.

If you can afford the almost $1,800 price tag, you will get extremely high efficiency along with an electronic control system and safety system that will ensure your unit stays functioning for a very long time.

That is only the tip of the iceberg. This tankless water heater comes loaded with features, such as -
  • Digital Display
  • Two-pipe direct vent system
  • Built in electric blower
  • Guardian overheat film wrap
  • EZ-Link Cable
  • High Altitude Capability (up to 9,840 feet!)
  • Digital Remote Control
  • 10 feet of thermostat wire
  • Freeze protection up to -30 degrees Fahrenheit
With an impressive flow rate of 6.6 gallons per minute, the Takagi Tankless Water Heater can provide instant hot water for a small family without any worries. However, if you use more hot water than the average household, you might want to invest in Takagi’s 10 gallon water heater.

Takagi T-KJr2U-140,000 BTU Natural Gas Indoor Non-Condensing Ultra-Low NOx

Takagi produces some of the best, and most affordable, tankless water heaters. If you live in a small residential unit and want an excellent unit at low cost, this could be the best option for you.

For only around $580, you get loads of features.
  • 6.6 GPM flow rate.
  • Computerized safety features.
  • Energy Start certification.
  • Temperature range of 100-185 degrees Fahrenheit
  • 140,000 BTU
  • Energy factor of 0.82
  • Overheat, freeze and surge protection are some of the safety features incorporated
  • Limited 12 year warranty
Perfectly portable, perfectly easy to install, and perfectly affordable, the Point-Of-Use Mini Tank Water Heater by Bosch provides hot water at your sink immediately. However, if you’re looking for a large tankless water heater to supply the whole home, Bosch has just the thing with the Tronic Whole House Electric Tankless Water Heater.

BOSCH ES2.5-Point-Of-Use Electric Mini-Tank Water Heater, 2.7-Gallon

BOSCH provides low cost, easy to install tankless water heaters. This model in particular is one of the best values currently available, at around $158. This mini tankless water heater takes very little time to install and is perfect in tight locations such as trailers, campers, or small apartments. It is designed only to provide hot water for use at a sink, perfect for making a hot cup of tea quickly or a bowl of oatmeal.

For such a small water heater, it contains a lot of features, including-
  • Light Weight: 24.3 pounds
  • 2.7 gallon tank
  • 1 year warranty
  • Compatible with any 120V outlet.
  • Glass lined tank
  • Fast recovery rate
  • External dial control
  • Sleek design

How Do I Choose the Best Tankless Water Heater?

There are two types of bad days: annoying ones and those that are so bad they’re laughable. A typical annoying bad day can involve forgetting your world atlas at home, yet your first class in school is Geography. The other kind of bad day has three misfortunes.

Let’s say you were supposed to wake up at 5:00 A.M and prepare a PowerPoint presentation for a prospective client. Unfortunately, you forgot to set your alarm clock the previous night, and you wake up two hours late. You jump out of bed and dash for the bathroom, only to step on a Lego that your kid must have left lying around the previous night. With a grimace, you make a mental note to get that toy organizer your spouse has been telling you about as you limp to the bathroom. However, your woes are not over. On opening the tap, icy water hits your back, almost paralyzing you. It’s at this point that you realize you forgot to turn on the tank water heater the previous night. Had you invested in a tankless water heater, a hot shower would have been the silver lining to your dark cloud.

With a tankless water heater, you never have to agonize about forgetting to switch on the water boiler as it works instantly. Also, unlike the conventional tank water heater, a tankless one yields considerable energy savings as it doesn’t have to remain on at all times. Further, it takes up less space, which is a plus if you have a small apartment.

At the end of an exhausting day, we all need that hot shower to restore us to our level-headed self. By purchasing one of our selected products, we’re sure that you’ll find something that meets your needs.
How much should you spend on a tankless water heater? Does spending more translate to better quality? Like with all household appliances, the best tankless water heater is one that allows you to maximize utility at the minimum cost. Considering the long-term savings it generates, a tankless water heater is relatively affordable. However, there are pricier ones whose numerous bells and whistles improve their efficiency dramatically. In our view, these are the best ones to go for. That said, it’s important for us to mention that you should avoid cheap tankless water heaters as they may not give you the best value for your money.

The price of our selected tankless water heaters ranges from around $200 to $1500, with the massive range being accounted for by differences in features. For example, a product that has surge, freeze, and overheat protection is going to cost you more than one that does not, all other factors remaining constant.
A tankless water heater embodies the emerging customer preference of on-the-go or on-demand quick service. All you have to do is turn it on, and Voila! Let’s look at features that you have to consider when looking for a tankless water heater.
  • BTUs per Hour - This is the amount of heat needed to raise the water temperature by 1 degree Fahrenheit.
  • Power Source - A tankless water heater may derive its power from electricity or gas.
  • Flow Rate - This is the volume of water that passes through the appliance in a certain period.
  • Energy-saving Capabilities - Does the heater have features that help boost its efficiency factor?
  • Overheat, Freeze, and Surge Protection - Your tankless heater’s capacity to withstand unexpected imbalances improves its durability.
  • Warranty - Does the manufacturer provide a guarantee?
  • Digital Display - The more interactive the appliance is, the easier it is to operate.
Construction and Design
When we’re looking at the construction and design of a tankless water heater, there are four main things to consider; power source, BTU’s, flow rate and display. Let’s look at these in some more detail now.

Power Source

The first factor that you should consider when buying a tankless water heater is its power source. If you live in a place where electricity is cheap, an electric heater is what you need. However, if you reside in an area where natural gas is in great abundance, a gas-powered tankless water heater will help you to keep your utility bills at the minimum. We’re confident that this review will help you make the correct decision as our selection includes gas, electric, and gas/electric tankless water heaters.

BTUs per Hour

The amount of heat needed to raise the water temperature is also an important consideration factor. The perfect tankless water heater is one that’s efficient at increasing this temperature; in other words, very little heat leaves the system. The BTUs per hour of our selected heaters ranges from 82,000 to 199,000, which makes them very efficient!

Flow Rate

Further, the appliance’s flow rate is something you have to keep in mind when buying one. You don’t want a tankless water heater that produces drops of hot water, but is supposed to serve a family of five. In our selection, the heater that has the lowest flow rate allows a respectable 6.8 gallons per hour, making it ideal for single users. If you have a big family, we would advise you to go for our featured heaters that have a flow rate of at least 5.5 gallons per minute.

Digital Display

Since the tankless water heater is a relatively recent product, it helps a lot if you can interact with it and set it to your preference. After all, we’re in an age of technologically-adept consumers. One of our selected brands has tapped into this trend by adding an interactive digital display to its tankless water heaters.
Performance and Ease of Use
Tankless water heaters are naturally more convenient than a water heater with a tank due to their compact size but there are other benefits to these beauties.

Overheat, Freeze, and Surge Protection

Power surges are fairly common, particularly if you live in a place that’s prone to heavy rains, cold winters, and even forest fires. As such, having household appliances that have surge protection is a must. The brands we’ve featured are well-aware of this, and one of them has gone two steps further by adding freeze and overheat protection to its tankless water heater. That way, you will never have to worry about losing your heater prematurely to forces you have little control of.

Energy-saving Capabilities

An energy-saving feature is also a plus on a tankless water heater. An efficiency factor of at least 0.65 enables you to realize significant heating expense savings. With an Energy Star certification, three of our selected products are quite energy-efficient.


Finally, the warranty is crucial as it obliges the manufacturer to provide support at zero cost for a specified period. Our selected brands offer a warranty that ranges from one to twelve years. However, there is a caveat: a warranty is only valid if a certified technician installed your tankless water heater. It is, therefore, crucial to have a qualified individual set up your heater once you purchase it.

Get the Best Tankless Water Heater of 2022!

There are countless companies out there that claim to have the best tankless water heaters in the market. However, few can back up these bold words with their products. The brands we’ve selected have consistently done it, thereby creating a name for themselves in this niche market. If it turns out that none of the items we reviewed matched your preferences, kindly look at the other items produced by these brands.

Our Top Choice
Rinnai RUC98iN Natural Gas Tankless Water Heater
Best Value
Stiebel Eltron Tempra 24 Tankless Water Heater
Rheem Indoor Direct Vent Tankless Water Heater
Takagi Natural Gas Indoor Tankless Water Heater
BOSCH Point-Of-Use Mini Tank Water Heater