Best Electric Tankless Water Heater Reviews and Buying Guides – 2020

Are you thinking about upgrading your old and obsolete tank water heater? Then you are just searching in the right place. Modern tankless water heaters can be powered from electric or gas. If you are not living in the USA's northern part, you should look for an electric powered tankless water heater. But finding the best electric water heater is not an easy task.

I don’t have to tell you that there are hundreds of electric water heater brands in the USA, and each of them considers themselves the best. But our team has researched hundreds of brands in the market to deliver you the best electric in line water heaters.

Here we have written the electric heater review based on the product's feature, value for the money, and the reputation of the brand. We even read countless reviews from actual users. If you are going to buy from this list, you will be sure that you are buying the best tankless hot water heater. So, without wasting your valuable time, let’s check them, and I hope you will find your ideal heater.

Top 10 Best Electric tankless water heater

1. Stiebel Eltron Tempra Plus 29 KW

Suppose you are thinking about upgrading your tankless water heater or changing it. In that case, one of the best choices could be the German-made Stiebel Eltron Tempra Plus 29 KW. The Stiebel tankless water heater is known for its effectiveness and reliability and is famous for its low noise. While some electric tankless heaters generate a lot of sounds, the Stiebel Eltron 29 operates silently.

The Stiebel Tempra 29 plus comes with a brilliant and compact design. It is the size of a briefcase, and you don’t have to create any extra space to store the tankless electric water heater. Its weight Is 19 pounds and the dimension is 22.4 x 12 x 20.1 inches.

Besides its compact design, you can easily control the water temperature. The latest control and monitoring system allows you to adjust the temperature from 86 to 125f (30c to 52c). The smart digital display and knob help you to set your desired temperature quickly. It will also supply you with limitless water at 1.5 to 2 GSM up to 3 to 4 continuous showers. At 90° rise, it will give you 2.5 GSM flow, but if you lower the temperature and 20° rise, it will provide you with 8 GSM water flow.

Even though many electric tankless heaters are very efficient, the Stiebel Eltron 29 is one step ahead. It doesn’t waste the slightest amount of energy and saves a lot of your money. Besides, it is also known for its flow rate, and it will supply your desired temperature even if the outside temperature is freezing. So, even if you live in Alaska or someplace where the temperature is very low, this Stiebel electric tankless water heater won’t disappoint you.

However, no matter how stunning the tankless heater is, it will fail to impress you if it costs you a ton of money. Initially, it may seem expensive, but it will save you thousands of dollars in the long run. The Stiebel tankless water heaters will at least save at least 15-20% of your electric bills. So, you do the math of how much it will save you in 5 to 7 years.

What we like

  • It supplies a high amount of warm water with no temperature fluctuations
  • You can set the temperature easily with the digital display
  • It keeps a lot of money by cutting the energy bills up to 15-20%
  • Even in a cold climate, it can deliver the desire warm water
  • It can operate silently
  • It is compact and doesn’t need any venting

What we don’t like

  • Initial cost is slightly higher than other heaters
  • The warranty requirements are hard to fulfill

If you are not running on a tight budget and want a quality tankless water heater for long time use, it should be a wise choice.

2. Eco 27 tankless water heater

Are you looking for the best tankless water heater brands? I believe the eco tankless water heaters will come at the top. It has earned this fame by providing the best electric tankless water heaters in the market. The name “Eco-smart” suits this Electric Tankless Water heater perfectly because of its Smart, efficient, and small design. 

The ecosmart tankless water heater 27 comes with a compact and simple design, only the size of a briefcase or laptop. It is 13.75 pounds weight, and its dimension is only 17 x 17 x 3.75 inches. Its electrical requirements are 27 kW, 240 volts, 40 required breakers, 112.5 maximum powers (AMP) and 8 required wires.

Now you know about its compact design, you will be surprised to know about its smart temperature controlling system. You can adjust the temperature between 80 -140-degree Fahrenheit with the digital controlling system. On the other hand, you can control the temperature by 1 degree with the digital controlling system.

However, its impressive flow rate also attracts many people who are thinking about replacing or upgrading their electric tankless water heater. Even if the outside temperature is 37-degree Fahrenheit, this tankless water heater keeps its promise to supply you the 3 GPM flow rate (2 showers at the same time). But if the temperature gets a little bit warmer, then it will provide you 6 GPM flow rate (4 showers at the same time).

Another great thing about this eco water heaters is its smart self- modulating technology. It is 99.8% energy efficient and saves up to 50% heating cost of the owner. So, can say it’s the best energy efficient hot water heater.

Lastly, the copper and stainless-steel construction ensures the durability of the eco water heater. The company is so confident about its strength that they provide a lifetime warranty for this tankless water heater. Thus, the initial electric water heater cost may seem a little bit higher than other tankless water heaters, but in the long run, it will save you tons of money.

What we like

  • It provides continuous hot water even if the outside temperature is freezing
  • The modulating technology ensures 99.8% energy efficiency saves up to 50% heating cost
  • You can adjust the temperature by 1-degree Fahrenheit
  • The compact size of the electric water heater saves a lot of your space
  • Its stainless steel and copper construction ensures its durability

What we don’t like

  • The complex warranty requirement makes it extremely difficult to get the lifetime warranty

Considering the ecosmart eco 27 review, if you are looking for a cost-effective water heater, it could be a wise pick.

3. Rheem tankless water heater review

The Rheem rtex 13 is the successor of the rte13, which is also one of the efficient tankless water heaters. Although it is a comparatively new tankless water system, it’s able to create its place among the best tankless water heaters.

One of the most priceworthy features of this Rheem tankless heaters is its energy efficiency. The water heater is 99.8% energy efficient, which cut down more than 50% water heating cost of the owner and saves a lot of money. That’s why it’s considered the best energy efficient water heater.
Apart from its energy efficiency, it is also famous for its flow rate. It can supply you 4 GPM water heater which is enough for running a shower and a kitchen tap simultaneously.

However, the tankless hot water heater comes with a compact size that doesn’t require any extra space. Its weight and dimension are 8.5 pounds and 4 x 9 x 13 inches. Because of its compact design, you can easily store it under the kitchen sink. Its electrical requirements are 240 volts, 13 KW, 3-foot electric cable.

Though it comes with a compact design, its user-friendliness makes it one of the best electric tankless hot water. The digital LED display and temperature controlling system allows you to control the temperature by 1-degree Fahrenheit accurately. Not only that, but it is also easy to install, and any professional plumber can install it within one hour. Even a well-equipped person can install the Rheem tankless electric by spending not more than two hours.

Lastly, the Rheem tankless is not only come at an affordable price, but also it is made of durable elements. Its long-lasting copper construction ensures instant hot waters. Because of its sustainable design, the company provides 5 years warranty to its original customers.

What we like

  • It provides 4 GPM hot water, which is enough to run 1 shower and a kitchen tap simultaneously
  • The compact heater supplies instant hot water
  • It comes at an affordable price with a 5 years warranty
  • The tankless is 99.8% energy efficient
  • It is easy to install and operate

What we don’t like

  • It is not a great deal for large households because it cannot supply enough hot water to multiple showers simultaneously

If you are looking for a small and compact water heater, then the Rheem electric tankless could be a wise option. It is efficient and comes at an affordable price.

4. Marey water heater
If you notice the marey water heater, you will initially see the bluish waterdrop styled LCD panel within a compact white casing. If its outlook doesn't fail to impress you, be sure that you will love its features after reading the marey tankless water heater review.

The German-designed tankless boiler is lightweight, compact, and durable. It will take the least amount of space to fit in, and its weight is only 10.1 pounds. It has a diameter of 8.7 x 3.5 x 14.2 inches, so you can mount it anywhere you want.

Besides its compact design, it is an efficient tankless water heater. It can maintain its 98% efficiency rate through its service life, and the best part is, it consumes 60% less energy than most of the tankless heater in the market.

However, it's easy to operate, and you can effectively program your desired hot water with the LCD panel. It can supply you continuous hot water for two simultaneous points with a flow rate of 2.5 GPM up to 41°F. But if you live in a cold area like Alaska, you may not get more than 1.5 GPM flow rates. But to get this high flow rate hot water, place the heater not far from 40 feet.

You can expect instant hot water after installing the marey water heater. It can supply you water from 5 to 85 psi. You can operate the heater in 220v~240v, and you will also need a 70-amp double pole breaker.

What we like

  • It is compact, lightweight, and durable
  • It can supply up to 2.5 GPM up to 41°F
  • Its advanced stainless steel water channel is corrosion resistance
  • Highly efficient and quickly get your desired hot water with the LCD panel
  • It is affordable and comes with a complete 5-year warranty

What we don’t like

  • Some customer has experienced leakage of water from the back of the heater

So, if you won't need a large amount of hot water heater or looking for small tankless water systems just for your sink or shower, then it might be a good option. It is long-lasting, efficient, and affordable.

5. Rheem hot water tanks: Rheem RTEX-18 

Rheem tankless is one of the top quality tankless water heater brands in the market. Among their hundreds of models, the Rheem RTEX-18 is considering as one of the best tankless hot water electric. It is lightweight and highly efficient.

It is a lightweight tankless water heater that can supply continuous water for multiple applications or single point-of-use. It is only 8.5 pounds in weight and 4 x 15 x 19 inches in diameter. So, you can mount this tankless Rheem in any location you want.

However, Rheem tankless hot water heater is mostly known for its high-efficiency rate. Its efficiency rating is about 99.8%, and because of this feature, it saves a lot of your money. You can also adjust the temperature with the digital LCD from 80 degrees F to 140 degrees F. You can control the temperature with 1-degree increment with the LCD panel.

Besides its efficiency, the Rheem professional water heater has a flow rate of 4.4 GPM. Its durable copper immersion two heating elements help supply endless water heater for two showers or one shower and one sink even in cold colder climates. But if the temperature drops significantly, then its flow rate reduces to 3 to 3.5 GPM. Its power requirements are 18 kW, 240 volts, and 75 amps.

What we like

  • It is relatively easy to install
  • Lightweight and its efficiency rate is 99.8%
  • Self-Modeling technology automatically supplies more power if needed
  • You can adjust the temperature with a 1-degree increment with the LCD panel
  • It can supply endless water for two showers at a 4.4 GPM flow rate
  • It comes with a reasonable price tag with a 5-year complete warranty

What we don’t like

  • It is larger than other tankless heaters
  • It does make some noise though it’s not harsh

Nothing is perfect, and we all know that. It does have some minor issue with the size and the noise but other than that it’s an excellent hot water heater. If you are an efficient and longtime usable heater, then rheem rte18 might be a great option.

6. ECOTOUCH tankless electric hot water

Are you looking for a top-quality tankless water heater for sink? I think the ECOTOUCH water heater could be a wise option as it comes with some fantastic features at a reasonable price. It is compact, lightweight, and energy-efficient. But it has limited supplying capacity so you cannot use it for a shower.

If you look at the ECOTOUCH tankless electric hot water then first you will notice that it comes with a white tank with deep blue LCD. You can control the temperature with it up to 116 ℉. But you may not get more than 96 ℉ if the outside temperature is pretty low. 

Another impressive feature is 98% optimal thermal efficiency, which will save many electric bills. However, it can supply endless water with a 1.2GPM flow rate. But if you lower the temperature, then it may deliver you hot water with 1.5 GPM flow rate. It is an instant hot water heater and takes only 3 seconds to supply the boiling water. It comes with smart modulation technology. If the outside temperature is low, it will provide more power to deliver the desired water.

It is easy to install, and anyone with good plumbing knowledge can set up the tankless water heater. However, we recommend taking help from an expert. Its power requirements are 5.5kW, 240V~60Hz Voltage, 1x 2-Pole 30 AMP circuit breaker.

What we like

  • It's compact, lightweight, and comes with an attractive design
  • You can set the temperature with the LCD between 67℉ to 116℉
  • It has a decent flow rate of 1.2 GPM
  • Its efficiency rate is 98%, and it is 65% efficient than other heaters
  • The black variant comes with a wireless remote
  • It comes with multiple safety layers to ensure 100% safety protection

What we don’t like

  • It is not suitable for a shower
  • It's not ideal for northern areas, as you may not get more than 96 ℉ hot water

It is an ideal under sink hot water tank with lots of modern features. But if you are looking for an electric hot water heater for shower and sink, then you should seek other heaters.

7. ATMOR electric tankless hot water

The Atmor AT-910-24TP is another top-quality tankless electric water heater. It is an instant water heater designed for small to average households. It is compact and does not enquire any extra space. Besides it also comes with some unique features.

First of all, the atmor tankless water heater is easy to operate as it is compact, lightweight, and doesn’t require any venting. So, you can easily mount it in the wall. Besides, it is only 17 pounds weight, and its diameter is 17.4 x 5.2 x 13.4 inches.

However, suppose you are moving from tank water heater to an electric tankless hot water heater. In that case, you are going to love this feature. It is 50% efficient than the regular tank water heater. It can deliver you endless water with a flow rate of 2.45 - 4.97 GPM, which is enough to run 4 appliances (Two showers, one-bathroom sink, one kitchen sink).

Though its flow rate is quite impressive but cannot provide you more than 73°f worm water, it is a downside of the atmor electric tankless water heater. But it is one of the safest tankless water heaters, as it is one of the IP54-certified splash resistant heater.

Lastly, it can serve you instant hot water, so you don’t have to wait for long. It is easy to install and doesn’t require any professional plumber though it is recommended.

What we like

  • Easy to install
  • Lightweight, compact, and do not require any venting
  • It is 50% energy efficient than the tank water heater
  • It is an ideal option for the small to the medium house as
  • It has a decent flow rate of 2.45 - 4.97 GPM
  • It can deliver instant hot water
  • IP54 splash resistant
  • It comes with an affordable price with 7 years for leakage and 2 years for parts

What we don’t like

  • 1.It is not ideal for northern areas and large households
  • 2.It takes time to get used to it

The atmor tankless electric instant water heater could be an ideal option for those who live in warmer areas. It is affordable and serves you with instant hot water.

8. Sio Green IR260- Under sink heaters

Are we looking for a tankless water heater sink? I guess one of the best options would be the Sio Green IR260- electric point of use water heater. There are a couple of reasons behind supporting this under sink heaters. One of them is its efficiency and instant hot water. There are also other features available, which we will discuss later on.

Firstly, you don’t have to spend any penny on the maintenance of the tankless water system. Because most of the electric under sink water heater uses metallic elements to supply hot water, but this heater uses a technology that doesn’t touch with the water. So, it lasts four times more rather than the metallic code heaters.

Secondly, you don’t have to wait for more than seconds to get hot waters with this under sink instant water heater. Besides, it comes with four power levels, which make the power controlling easy. You can get hot water in a 2 GPM flow rate. But if the outside temperature decreases, then you may get low flow rate water.

However, it’s a compact tankless water heater, and it won’t take any extra space in your kitchen. It is lightweight and easy to install. Any person with good plumbing knowledge can fix it though we recommend seeking help from a professional.

Lastly, If it is going to cost a ton of money, then obviously you won’t buy it. It comes with an affordable price. It also offers ten years of quartz elements and three years on electric components.

What we like

  • It is compact and easy to use
  • No maintenance cost is required
  • It ensures instant hot water
  • It doesn’t make any extra noise
  • You can even use it in your RV
  • It comes with 10-years warranty
  • Efficient and easy to install

What we don’t like

  • Less flowrate
  • It might be bigger than expected

It might be a good option for an under sink instant water heater, but if you are looking for a heater for the whole house, then it’s not a wise option.

9. Bosch Electric Tankless Water Heater: Bosch Tronic 6000 C

Bosch tankless comes with a variety of models, and one of them is the Bosch Tronic 6000 C. It is mainly designed as a whole house water heater though Bosch also has other models that are used as the best point of use tankless water heater. It is compact and doesn’t take much place to fit. But it also comes with some other unique features.

One of the advantages of this heater is a compact, lightweight, and gorgeous design. It is only 18.7 pound’s weight, and its dimensions are 15.5 x 4.5 x 12.5 inches. So, you can mount it on the wall or fit it anywhere you like.

Another impressive part is, it is 97% efficient, so you can use it without wasting any energy. It can also provide you whole house instant hot water; so, you don’t have to spend any seconds to get hot water.

However, you can also be able to get a considerable amount of warm water for your shower and sink. The tankless water heater flow rate is 4 GPM flow rate at 45 ºF. But if the outside temperature decreases, then you may get 3.6 or 3 GPM flow rate. If you don’t live in the northern part of America, then you can expect endless water in 3 showers or 2 showers and one sink.

Lastly, you can control the temperature with the control knob. There is also a digital display to make the job easy for you. The company provides a 5-year limited warranty for the product. Its power consumption is 240 volt-17.3 KW and 120amp circuit breaker.

What we like

  • 1.It is compact, lightweight, and comes with an affordable price
  • It is 97% energy efficient
  • It is an ideal option for a small house or office
  • Long-lasting and comes with a 5-year warranty
  • Smart temperature controlling system

What we don’t like

  • High installation cost and require professional support
  • It cannot deliver the desired hot water when the temperature drops significantly

The Bosch instant hot water heater may not be the best, but if you don’t live in the USA's northern part, it might be a good option for your house or office.

10. Titan electric water heater: Titan SCR2 N-120

Are you looking for a lightweight tankless water heater? I guess the titan n 120 tankless water heater could be a wise option. Besides its compact size and lightweight feature, it also comes with various other unique features that you might find interesting.

One of the best parts of titan n120 is its compact size. It is only 8 pound’s weight. So, mounting on the wall isn’t a big problem. So, you see it won’t require any extra space for titan compact water heater. Its dimensions are 7 x 10 x 2.75 inches. It is about 80 times smaller than a traditional tank water heater.

On the other hand, the titan scr2 is energy efficient, and it is about 40% energy efficient than other tankless water heaters. Its self-modeling sensors turn off the titan water heater n120 and reduce any energy loses.

Now, it has a considerable flow rate of 4 GPM. But you won’t get it, if the outside temperature is less than 65-degrees F. I must say that, 4 GPM water flow is enough to supply water in 2 showers and 1-sink or 3 showers. Besides, you can install it with basic plumbing knowledge. All you will need is a 6 AWG wire and a 60-amp breaker.

The titan n120 water heater's design may seem pretty old, and you won’t get a gorgeous outlook, but it does its job quite well. So, operating the titan tankless may not seem as easy as the other modern tankless. Lastly, the titan heaters electric comes with a 10-years warranty.

What we like

  • Compact, lightweight, and comes with an affordable price tag
  • 40% energy efficient than other heaters
  • Effortless installation
  • It works pretty well in hard water also
  • It can supply enough hot water for a medium house or office
  • The company offers a 10-years warranty

What we don’t like

  • If the outside temperature is less than 65-degrees F, it won’t supply hot water for three showers
  • The outlook seems quite old

If you are looking for a water heater for a long time use for your house, then the titan electric heater might be a good option.

Final Verdict

Our team tried our best to let you find the best electric tankless water heater for you. But I must tell you that if your life is in the USA's northern part, then an electric heater might not be suitable for you. You may need a more powerful heater for yourself. But in a warmer climate, the electric heaters work just fine.