10 Best Electric Tankless Water Heaters

In today’s day and age, advanced technologies have made fast and quick machines. The invention of a top-notch electric tankless water heater is a testament to that!

These advanced electric tankless water heaters are built for your use and efficiency compared to previous water storage and heating units.

These tankless electric water heaters provide heated water only when needed. They do this without needing a storage tank to heat and store water.

Unlike other water appliances that come equipped with water storage tanks, an electric tankless water heater requires none!

With a constant hot water demand, these tankless water heaters only need electricity for immediate hot water.

Keep on reading to get your hands on the best electric tankless water heater!

DISCLOSURE: We may receive commissions when you click our links and make purchases. However, this does not impact our reviews and comparisons. We try our best to keep things fair and balanced, in order to help you make the best choice for you.

Our Top Pick


Stiebel Eltron Tempra

Stiebel Eltron was one of the first companies to produce and indulge in electric tankless water heater technology. Their main focus is your comfort and cost-efficiency. This is why the Tempra Plus guarantees cost-saving.

Why Choose an Electric Tankless Water Heater?

The choice of whether you should get an electric tankless water heater depends on the advantages it has. We’ve listed all the advantages below!

Saving Energy

Unlike conventional tank water heaters, electric water heaters don’t keep on running. They don’t need to operate constantly to keep the water hot. Electric tankless water heaters only work when a faucet or tap is used.

In doing so they avoid standby heat losses.

Saving Space

With technological advancements, electric water heaters are now small in size and take up very little space. In addition, they can be installed anywhere and even on walls!

Overall Costs

Other wear appliances and gadgets are costly during purchase as well as maintenance, like a whole house water filter for instance.

Although there is a range of electric tankless water heater prices, the overall cost makes up for the energy-saving costs that these units save.

Endless Hot Water

According to your house, your electric water heater will never run out of hot water! This is due to two reasons:

  1. They are tankless
  2. They don’t need warming up.

Parts can be Replaced

Tankless water heaters have a lasting life of up to 8 to 12 years.

However, the best tankless water heaters also have parts available for replacement if ever needed! You know you’re at the end of your water heater capacity once it starts leaking.

Best Electric Tankless Water Heater Comparison

Image PRODUCT/ Features Rating  
Top PickComparing Stiebel Eltron Tempra Plus Stiebel Eltron Tempra Plus Temperature Range: 86F – 140F
36 kW
16.54 inches x 4.61 inches x 14.53 inches
19 pounds
240 Volts
Read Full Review
Budget PickComparing ECOTOUCH ECOTOUCH Temperature Range: 67F – 109F
5.5 kW
15 inches x 11.02 inches x 4.84 inches
6.87 pounds
240 Volts
Read Full Review
Value PickComparing EcoSmart ECO 27 EcoSmart ECO 27 Temperature Range: 80F – 140F
kW: 27 kW
Price: $$$
Dimensions: 3.63 inches x 17 inches x 17 inches
Weight: 11 pounds
Voltage: 240 Volts
Read Full Review
Comparing EcoSmart ECO 36 EcoSmart ECO 36Temperature Range: 80F – 140F
kW: 27 kW
Price: $$$
Dimensions: 3.63 inches x 17 inches x 17 inches
Weight: 11 pounds
Voltage: 240 Volts
Read Full Review
Comparing RHEEM RTEX-13 RHEEM RTEX-13Temperature Range: 35F – 75F
12.63 inches x 8.25 inches x 3.63 inches
0.01 ounces
240 Volts
Read Full Review
Comparing Bosch WH27 Bosch WH27Temperature: 100F – 184F
kW: 26.9 kW
Price: $$$$
Dimensions: 15.5 inches x 4.5 inches x 12.5 inches
Weight: 19.5 pounds
Voltage: 240 volts
Read Full Review
Comparing Titan SCR2 N-120 Titan SCR2 N-120Temperature: 65F- 85F
kW: 11.8 kW
Price: $$
Dimensions: 12 inches x 10 inches x 5 inches
Weight: 2 pounds
Voltage: 220 volts
Read Full Review
Comparing ECOTOUCH ECO 90 ECOTOUCH ECO 90Temperature: 67F – 106F
kW: 9 kW
Price: $$
Dimensions: 15.74 inches x 10.24 inches x 2.05 inches
Weight: 10.93 pounds
Voltage: 240 volts
Read Full Review
Comparing Rheem RTEX-27 Rheem RTEX-27Temperature: 80F – 140F
kW: 27 kW
Price: $$$
Dimensions: 4 inches x 18 inches x 19 inches
Weight: 17.8 pounds
Voltage: 240 volts
Read Full Review
Comparing iHeat Tankless iHeat TanklessTemperature: 80F – 140F
kW: 9 kW
Price: $$
Dimensions: 3.5 inches x 7.7 inches x 11.5 inches
Weight: 8 pounds
Voltage: 240 volts
Read Full Review

1. Stiebel Eltron Tempra Plus (Top Pick)

review of Stiebel Eltron Tempra Plus

The Stiebel Eltron Tempra Plus electric tankless water heater is one of the best tankless heaters available in the market.

Operating on a no sound system, these tankless water heaters naturally will never run out of water! In addition, they operate on 99% energy efficiency, to save energy.

Stiebel Tempra Plus tankless water heaters provide a constant hot water supply whenever required.

It consists of an advanced control flow feature. This helps to maintain a constant temperature throughout whenever the water is being used. This tankless system adjusts itself if the hot water capacity is about to deplete to lessen the flow rate for a continuous supply.


  • Style: Tempra Plus 36
  • Model number: Plus 36
  • Color: Gray


  • Equipped with a digital temperature display
  • Heating chambers composed of solid copper
  • Comes with a self-modulating technology
  • Uses the advanced flow control technology
  • Requires a minimum flow rate of 0.77 gallons per minute for unit activation

The Stiebel Eltron Plus is the ultimate electric tankless water heater that makes no noise. In addition, its compact size uses less space.

Unlike a water softener, these electric water heaters are tankless and therefore require no maintenance!

Customer Rating: 4.5 out of 5 stars.

+ Energy efficiency leads to greater energy savings through self-modulating technology
+ Energy savings result in low electric bills
+ Provides consistently hot water on a low capacity
+ Comes with a 7-year leak warranty and 3-year parts warranty
Difficult to install yourself

2. ECOTOUCH (Budget Pick)

review of ECOTOUCH

The ECOTOUCH electric water heater is equipped to provide piping hot water. It requires no preheating and provides instant water consistently! Your hot water supply will never run out!

The tankless electric water heater is small in size making it easy to install at any point of use entry.

These tankless water heaters operate on 98% thermal efficiency that guarantees your hot water demand.

Since they’re tankless water heaters, they prevent the accumulation of bacteria unlike in water systems equipped with tanks!

The smart modulation design and energy efficiency make it the perfect water appliance for your sinks, bathrooms, or anywhere you require!


  • Style: ECOTOUCH 55
  • Model Number: ECO55
  • Color: White


  • Easily adjustable by yourself
  • Equipped with a digital display panel and touch control panel
  • Built with maximum durable and secure devices
  • Built to avoid leakage

The ECOTOUCH tankless water heater needs only a constant supply of electricity to run! Having no tanks, it provides heating water all the time without prolonged storage bacteria.

Customer Reviews: 3.9 out of 5 stars.

+ Heats water instantly
+ No leakage
+ Self-modulating technology for energy efficiency
+ Low electric costs
+ Easy to install yourself
Flow rates may vary when the water heater is nearing maximum capacity

3. EcoSmart ECO 27 (Value Pick)

review of EcoSmart ECO 27

EcoSmart is also the best electric tankless water heater. This tankless water heater focuses on energy efficiency, consistent hot water, and low heating bills.

Unlike a conventional water heater, the EcoSmart 27 does not include a storage tank. However, these electric systems provide endless hot water nonetheless.

The EcoSmart tankless electric water heaters also come with a smart self-modulating technology to make for low energy costs.

This instant hot water-providing heater guarantees consistent water flow as well! You don’t need to worry about hot water depletion!

With its small size, energy-efficient technology, the EcoSmart 27 provides hot water to large houses and for smaller colder inlet applications!


  • Style: EcoSmart ECO 27
  • Model Number: ECO 27
  • Color: White


  • Made with aluminum
  • Includes a digital temperature control
  • Components made of copper and stainless steel
  • 3/4 inch pipe fittings

Before purchasing the EcoSmart ECO 27, take into consideration your hot water usage. This is necessary to ensure that the model is the correct size according to your hot water and electrical requirements

Customer Ratings: 4.4 out of 5 stars


  • The small size makes for less space
  • Energy-saving abilities
  • Parts are easily replaced
  • Limited lifetime warranty


  • Piping hot water may be difficult to supply at a maximum flow rate
  • More energy consumption if installed in a smaller house
+ The small size makes for less space
+ Energy-saving abilities
+ Parts are easily replaced
+ Limited lifetime warranty
Piping hot water may be difficult to supply at a maximum flow rate
More energy consumption if installed in a smaller house

4. EcoSmart ECO 36

review of EcoSmart ECO 36

The EcoSmart ECO 36 is a well-used EcoSmart electric water heater. This electric heating system is a tankless unit.

However, this electric system can be powered by up to 36 kW.

It is an ideal electric water heater system for whole houses including a townhouse, apartments, etc!

The ECO 36  has a promising flow rate! The water flow depends on the incoming water temperature supplied. However, this tankless heater can provide between 3.6 to 8.7 gallons of hot water per minute.


  • Style: EcoSmart ECO 36
  • Model Number: ECO 36
  • Color: White


  • Digital heated output temperature display
  • 3/4 inch pipe fittings
  • Energy and installation guide provided
  • Up to 99.8% energy efficient

Coupled with its properties to be energy efficient, time-saving, and cost-saving the ECO 36 is one of the best electric tankless water heaters.

Customer Rating: 4.4 out of 5 stars

+ Provides a lifetime warranty
+ More than half can be saved on heating costs
+ Highly energy efficient
+ Parts are easy to replace
More electricity consumption in larger houses

5. Rheem RTEX-13

review of Rheem RTEX-13

Rheem is best known for its cooling and heating systems. The RTEX-13 tankless water heater is no exception to their lasting quality!

Although, unlike natural gas water heaters, the RTEX-13 is an electric model! But it’s built for your needs!

It is up to 99.8% energy efficient resulting in consistently low heating costs! Electric tankless water heaters do not need to be costly annually and the RTEX-13 proves that!

Alongside being an energy-efficient water heater, this heating system allows you to change the temperature in 1-degree additions or subtractions!

The Rheem RTEX-13 is an ideal electric water heater for residential use!


  • Style: RTEX-13 Electric heater
  • Model Number: RTEX-13
  • Color: Gray


  • Digital thermostat control
  • Includes ½ pipe fittings
  • Adjustable temperature settings
  • A flow rate of up to 3.17 gallons per minute

The RTEX-13 is a perfectly viable residential tankless water heater built for your needs and ease. This is an ideal heating system with fewer costs available at an affordable price!

Customer Rating: 4.5 out of stars

+ Easy to install and replace parts
+ Includes copper heating elements
+ External adjustable thermostatic control
+ Focuses on greater energy efficiency
Requires at least 60 Amps of power

6. Bosch WH27

review of Bosch WH27

This water heater is easy to install anywhere and doesn’t require any storage facilities either.

Bosch promises hot water whenever required while providing optimum water quality at the same time.

To have a consistent heated output temperature, the Bosch Tronic series has an electronic flow sensor. The electric model does all this while letting you control the heat and temperature.

Heating water is less of a hassle with the Bosch WH27 electric water heater. These heating systems focus on electricity conservation while providing hot water at the same time.

They’d be especially excellent compared to a conventional gas water heater that takes up too much space!


  • Style: Whole house WH27
  • Model Number: WH27 Tronic 6000 C
  • Color: White


  • Built-in flow sensor for temperature control
  • Covered in polymer elements
  • Outward temperature control knob
  • Includes new scale prevention technology
  • Small and lightweight

The Bosch Tronic series WH27 makes for a powerful whole-house electronic tankless water heater. Although it leans towards the pricier side, it gives you your money’s worth.

Customer Rating: 4 out of 5 stars.

+ Up to 97% thermally efficient
+ The small size makes it easy to install anywhere
+ Scale prevention technology enables temperature stability
+ Supplies hot water to the whole house consistently
+ 5-year warranty for heater and 2 years for parts
Most definitely requires a profe
Leans towards the expensive side

7. Titan SCR2 N-120

review of Titan SCR2 N-120

We have only compiled the best of the best from excellent companies for you.

The Titan N-120 tankless water heater also makes that list! This tankless water heater is most suitable for moderately sized homes.

It saves you in heating costs by saving energy up to 60% and only providing hot water when needed. They guarantee an endless supply of hot water for your whole house!

Overall the initial investment for a Titan N-120 water heater will make up the number of energy costs with a conventional fuel water heater!

With this electric model, you’ll never have to worry about running out of hot water ever! Multiple people can access hot water at the same time satisfactorily!


  • Style: Titan SCR2
  • Model Number: N-120
  • Color: White


  • Fitted with 1/2 inch standard pipes
  • All materials are made of brass casings

Includes a manual thermostat for reset

  • Also includes a duel microtemp thermafuse for protection

The Titan N-120 delivers hot water for houses with a temperature above 65F! Say goodbye to waiting long hours to access hot water without spending too much!

Customer Rating: 4.4 out of 5 stars.

+ Saves energy by up to 99.5%
+ Lightweight and compact
+ Easy to install
+ Extremely affordable
May have a low flow rate with rising in temperature


review of ECOTOUCH ECO 90

The ECOTOUCH ECO 90 is best for the southern region! They are not a whole-house tankless water heater. However, these water heaters are best for showers, sinks, dishwashing, and washing machines!

ECOTOUCH is known for its technological advancements and the ECO 90 is an example of that! ECO 90 electric water heater is up to 99.8% thermally efficient!

You can procure an endless supply of hot water while cutting energy costs. This water heater has steady hot water pressure.

Their smart modulating technology ensures the heating system has an accurate temperature delivery. It adjusts the hot water temperature based on flow rate.

No need to worry about your heating system warming up! Enjoy endless hot water at any time without running out!


  • Style: ECOTOUCH  ECO 90
  • Model Number: ECO90B
  • Color: Black


  • Installed with multiple protection devices for safety and durability
  • Includes a patent heating technology
  • Self-modulating control technology
  • Includes a touch control panel with a digital display

Available at an extremely affordable price, the ECO 90 is the perfect electric water heater fit for your home!

Customer Rating: 4.3 out of 5 stars.

+ Easy to use
+ Touch panel and control for regulation
+ Extremely thermally efficient
+ Compact and small design
Can’t be installed without a professional

9. Rheem RTEX-27

review of Rheem RTEX-27

Like the RTEX-13, the RTEX-27 also makes the list of one of the best electric tankless water heaters.

Similar to the previous Rheem electric tankless water heaters, this is also built for your needs and ease!

However, the RTEX-27 has a higher temperature range than that of the RTEX-13. Its temperature range lasts between 80 Fahrenheit to 140 Fahrenheit. Additionally, it uses up to 27 kW of power!

This electric tankless heater can be used for multiple applications or at a single point of use.

Enjoy the comfort of on-demand hot water at any time without any worry of water running out!


  • Style: Rheem RTEX-27
  • Model Number: RTEX-27
  • Color: Gray


  • LED display with digital control
  • Copper immersion for durability
  • Includes 3/4 pipe fittings
  • Simple installation

The RTEX-27 does have a price jump compared to the RTEX-13  above! However, the RTEX-27 uses a larger amount of power and can therefore heat a larger amount of water!

Customer Rating: 4 out of 5 stars.

+ Includes self-modulating technology
+ Made with 3 heating elements
+ Easy and simple to install
+ Adjustable power to get hot water on demand
An increase in power and temperature may result in a lower flow rate

10. iHeat Tankless

review of iHeat Tankless

The iHeat Tankless water heater uses a power of 9 kW. This is more than enough to supply hot water to your entire apartment.

The best feature about the iHeat Tankless is that it’s safe to use in any clean and sterile environment! These electric tankless water heaters are suitable to use in any area where cleanliness is most important!

However, the iHeat tankless water heaters also aim for cost-cutting by up to 60%. Available at an affordable price, these electric models control temperatures according to the heating power.

It can easily work in your kitchen to provide hot water in any faucet to your showers, washing, and sinks!


  • Style: iHeat S9
  • Model Number: S9
  • Color: Gray


  • Completely constructed from stainless steel
  • Waterproof exterior
  • Its compact size allows it to fit anywhere
  • Waterproof touchpad for temperature adjustments

If you’re looking for an ideal electric tankless water heater, the iHeat is a great option. It is affordable, energy and cost-conserving and provides hot water whenever required!

Customer Rating: 4.2 out of 5 stars.

+ Simple and quick installation
+ Small in size
+ Waterproof exterior
+ Best used in highly clean and sterile conditions
Not suitable for whole house water heating

What is an Electric Tankless Water Heater?

As depicted by their name, electric tankless water heaters only require electricity to get water!

Over the years, water heating has become easier. Traditional water heaters were larger and required gas to operate. This included storage tanks to store heated water whenever required.

In today’s age, you need electrical gadgets that save you costs annually. With an electric tankless water heater’s advanced technology you save costs!

Electric water heaters start working instantaneously as soon as a hot water tap is turned on. As soon as the hot water tap runs, the backwater supply starts sending cold water through the unit. In this case, the electrical power used will heat the water consistently.

Therefore, with an electric tankless water heater, you don’t need to worry about storage tanks or warming water.

You get an endless and instant supply of hot water without any hindrances.

One of the best tankless electric water heater being used in a residential home

How does an Electric Tankless Water Heater Heat Water?

The moment you open the required tap for heated water, the heating elements within the unit start heating the incoming cold water supply.

Once the faucet is running with hot water, the second unit has more cold water incoming. The second unit then uses these elements to heat the water supply.

This provides an on-demand supply of water. As soon as the incoming supply stops, the heating process stops as well!

What Should You Consider When Buying An Electric Tankless Water Heater?

Before getting your electric water heater, there are some factors of consideration involved. First of all, you need to be aware of your hot water requirements.

It’s not wise to buy the most expensive electric heater expecting it to be of top quality. Here are some consideration factors you should adhere to before buying your electric water heater:

Energy and Cost-Efficient

Most electrical water heater units use up to 98% of the power supply, thus resulting in no energy losses.

You need to make sure that your electrical system can withstand the power your electric water heater requires. These units require a large amount of power for proper operation. If your electrical system can’t withstand the heater’s power, you’ll have to update it.

The Design

It doesn’t matter if your water heater has an unappealing design. Tankless water heaters are designed to remain compact to install anywhere.

Furthermore, their simple design makes it easier to spot any problems and repair them on your own! Compared to a gas tankless water heater, this makes it easier to service your electric unit.

One of the best tankless electric water heater wall mounted beside a lavatory faucet


An electric water heater is expensive compared to any natural gas heating unit. However, some units may also require professional installation which is not a cheap expense.

Furthermore, you need to ensure that your electrical system is capable of handling the unit’s power supply. If not you’ll either have to change it or update it. This makes for an even more expensive cost than your initial investment.

Your Safety

Your electric heating unit getting the job done is not enough reason to buy it! You need a heating system made of durable and safe products.

Like the water heaters mentioned above, most of them are composed of protection devices. Some models also include self-modulation, temperature lock, advanced flow control, etc!

Water Flow

The best electric tankless heater should also have a consistent and strong flow rate. This depends on whether you purchase a whole house or a single-use heater.

A whole-house heating unit can provide hot water at a consistent flow rate. These units can supply heated water at a constant rate at multiple times.

Compared to this, a single heating unit can only provide a steady flow rate to a single hot water tap.


As already understood these products are used for several years. So you should get a heating system with a guaranteed warranty.

Like some heating systems we’ve mentioned above, they offer a heating unit and parts warranty.

Having a warranty guarantee can save you plenty of money in maintenance and repairs especially.

That’ll help you if a problem comes up in the unit’s parts or module.

Pros and Cons

+ Steady and constant water supply;  The best feature of these systems is that electric water heaters require only electricity for heating.
+ Environmentally friendly – No emission of greenhouse gasses
+ Saves Space – Small size takes up less space
+ Saves Costs – Thermally efficient to prevent standby heat losses
+ Long Lifespan – On average an electric water heating unit can last between 10-12 years.
+ Easily installed – Small stature makes installation easy
Low Water flow; All units do not guarantee a steady and high water flow with a high-temperature rise
Initial Cost – All units do not gravitate towards the affordable side but the initial investment to procure an electric water heater is usually hefty.
Electricity supply – Chances are to heat water your unit requires a large power supply. This will become costly if your electrical system seems incapable of handling that power.

FAQ on Best Electric Tankless Water Heater

Which is better, tankless or tank?

Overall, tankless units save more energy, costs and dispense an endless water supply. Their only down point is that they cost more upfront. In comparison, tank units are cheaper without the benefits mentioned above.

What Size Tankless Electric Water Heater Do I Need?

The optimum tank unit size can be determined by the following factors:
– The size of your house
– Your flow rate
– Your hot water needs
– The number of  people in the house

Where Should A Tankless Water Heater Be Installed?

It is recommended that a water heater should be installed in an airy area close to the power supply. Keep in mind also that the farther your heating unit is the more time, wiring, and pipes it’ll take for hot water to reach you!

Lastly, make sure that the unit is installed in a place of easy accessibility for any sort of repair and adjustment. However, make yourself acquainted with the instruction manual before you embark on the installation.

Can You Run Out Of Hot Water With A Tankless Water Heater?

No, you cannot! Tankless heating units heat water on demand and therefore have no means of storage or depletion. However, an increase in demand can decrease the overall flow rate depending on hot water usage.


With everything we’ve provided above, it’d be hard not to get your hands on the best electric tankless water heaters available on the market!

They’re worth your money for prolonged comfort and hot water and that’s our guarantee!

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