10 Best Electric Tankless Water Heater Reviews


your guide


With the right electric water heater in your home, you’ll always have enough supply for frequent showers, washing dishes and even cleaning up after your kids and pets. Tankless models appeal to those who live in smaller homes and those who want an on demand supply of hot water. These machine feature coils that heat the water up before it reaches you.

The EcoSmart ECO 36 36kw 240V (View on Amazon.com) is the best of the best. This model  has a larger capacity and will work for most homes. See how it stacks up against all its competitors before you buy.


EcoSmart ECO 36 36kw

EcoSmart ECO 36 36kw (Check Price on Amazon.com)


Guide on How to Choose What is Right for You 


Size Capacity

The most important factor to consider when looking at tankless models powered by electricy is its overall size capacity. If you have a larger home, you need something like the ECO 36 that can provide suply to any rooms. Some may not keep up with the demand of your family.



You should chose a model based on the climate of the region where you live. The temperature of the groundwater near your home plays a key role in how hot the water will feel on your skin. Smaller models can only increase the temperature by a few degrees.


Installation Basics

Consider where you want to install the hot water heater too. A whole home unit will go in your basement, laundry room or any other room where you used your old model. Point of entry units work with a specific object like your bathroom sink or shower and will only provide hot water for that one specific thing.


Gallon Per Minute

Gallon per minute, or GPM, is a measurement that applies to the flow rate of a water heater, which is the amount of hot or warm water it can supply to your home in a minute. A GPM of 2.5 is suitable for most homes. If you have multiple bathrooms, you’ll need a higher GPM.


Power Required

Never buy an electric water heater without first ensuring that it will work with your existing circuit breaker or fuse box. Manufacturers will give you this information upfront and let you know if you need a grounded outlet or any special connections to use it. You usually need a circuit breaker with 240 amps.



Though you may not want to admit it, price will be on your mind. Shoppers can pick out a hot water unit in the $500 range. Most of the top models cost $1,000 or less and cost less than natural gas or propane water models do.



Top Rated Models on the Market That You Need To Check 


1. EcoSmart ECO 36 36kw (Check Price on Amazon.com)

eco smart

Though EcoSmart makes a number of tankless water heaters for electric systems, the best from this company is the ECO 36 36kw 240V, which is also the largest. Depending on the temperature of the groundwater, you can enjoy a GPM of more than three.

That large amount of water will help you run all your appliances and take showers without running out of hot water. Measuring up to 90% less than a standard hot model with a tank, the ECO 36 will fit in any room that you choose for installation.

You’ll want to install it in a convenient location that will work with the appliances you want to run as well as your kitchen sink and bathroom features. EcoSmart added a temperature control that lets you change the temperature by one degree too.





2. Rheem RTE 13, 4 GPM (Check Price on Amazon.com)

Rheem RTE 13, 4 GPM

Though we like the ECO 36 the best, the Rheem RTE 13 comes close to beating that water heater because it has a GPM of four, which allows you to use two different sinks, appliances, showers or a combination of things at the same time.

The heat exchanger inside uses both brass and copper to last longer and do more efficient heating of your water. It even has LED lights on the front to indicate when it is in standby mode and when the machine is active.

The RTE 13 is also easy to install and will work with a standard circuit breaker of 240 amps. It has a modulating feature too. This feature lets the machine adjust the flow rate based on both the temperature of the water and the amount of water that you need.






3. Bosch T 2.5-Gallon (Check Price on Amazon.com)

Bosch T 2.5-Gallon

One of the best single use electric hot water heaters that you can bring home today is this Bosch T 2.5-Gallon.

Designed for running a single application at a home, this mini hot water model is the perfect size for using under your sink and inside a cabinet.

It has a maximum flow rate of 2.5 GPM and is small enough that it won’t take away from your storage. The tank inside has a glass lining that keeps the water warmer, and you can plug it right into an outlet in the room or connect it to your electric system.

Bosch gives you a bracket that allows you to mount the device on a shelf or the wall too. It also has a faster recovery time that lets you enjoy hot water with less wait.




4. Stiebel Eltron Tempra 20 (Check Price on Amazon.com)

Stiebel Eltron Tempra 20

With the Stiebel Eltron Tempra 20, 240 V, 19.2 kW, you can finally ensure that every person in your home has access to hot water during the day and night.

Designed to heat the water that a whole home needs, this model is efficient and acts quickly to cut down on your wait. Once you install it, you’ll find that the cost of supplying your home with hot water drops by up to 20%.

If you want screaming hot water, you can set it to a commercial mode, which will significantly increase the temperature of the water supplied.

It also has a residential mode and third mode designed for washing your hands. The 20 Plus can provide you with water of up to 120 degrees Fahrenheit or even hotter.




5. EcoSmart 8 KW, 8 KW (Check Price on Amazon.com)

EcoSmart 8 KW, 8 KW

One of the best options for smaller homes and for single applications is the EcoSmart 8, which is part of the company’s ECO line. The modulating technology that EcoSmart designed lets the it automatically adjust the flow rate and water temperature based on the groundwater and the applications using it.

It works with a standard 240 volt circuit breaker too. As one of the most efficient hot water heaters, the ECO 8 can reduce your water heating bills by up to half what you normally pay and leave you feeling relieved when your electric bill arrives in the mail.

A silver button on the front functions as a temperature control for changing the temperature by one degree to give you more control. You can also use this button to switch between Celsius and Fahrenheit settings.






6. Marey ECO110 220V (Check Price on Amazon.com)


If you live in the south or a region with warmer groundwater Marey ECO110 220Vtemperatures, this Marey ECO110 will work well in your home. Marey recommends this model for areas where groundwater temps climb above 70 degrees Fahrenheit.

Though you can use it in other regions, it may not get the water as hot as you would like. Marey opted for stainless steel in both the heating chamber and the water channel, and this material won’t rust or corrode as the water flows through.

Using the LCD panel on the front lets you pick an exact temperature setting and change that temperature for other applications, which helps you save more on energy costs. The ECO110 requires little in the way of regular maintenance and has a 98% efficiency rating over the course of its life.






7. Atmor AT-D18TP-AZ Thermopro (Check Price on Amazon.com)

Atmor AT-D18TP-AZ Thermopro

Do you want instant access to hot water without running the faucet for a few minutes? This Thermopro tankless electric model from Atmor works so effectively and efficiently that it can provide any appliance, sink, tub or shower with hot water almost as soon as you turn it on.

It comes with a warranty that covers all parts for two full years and protects against leaks for seven years. The Thermopro works in most regions and can heat water that comes in at a temperature as low as 37 degrees Fahrenheit.

You’ll notice that the GPM rate varies due to the temperature and that it will produce a higher flow rate when the groundwater temperature is higher. With a handy digital temperature control, this model will maintain that temperature over the long run.





8. Bosch WH27 Tronic (Check Price on Amazon.com)


An easy way to supply your whole home with an almost endless stream Bosch WH27 Tronicof hot water is with the installation of this Bosch Tronic. When the groundwater outside is at a high and stable enough temperature, this model has a GPM of 3.3, which is enough for running two sinks, showers or appliances at the same time, though Bosch recommends using it with just one appliance for maximum results.

Bosch added elements inside that reduce scale build up, which make this hot water heater a suitable choice for those who have hard water.

You can also use it in the country and with well water without that water damaging the inside. With modulating technology and a 97% efficiency rating, the Tronic maintains your temperature too.






9. EcoSmart ECO 24 KW (Check Price on Amazon.com)

EcoSmart ECO 24 KWThe ECO 24 from EcoSmart is one of the middle of the road electric tankless hot water heaters that the company makes. Its modulating technology feature allows the machine to change the flow rate based on the groundwater temperature to ensure that the water comes out at the temperature that you wanted.

This model is 99.8% energy efficient to help bring down your water heating bills. With a temperature range between 80 and 140 degrees Fahrenheit, you can enjoy water that is just as hot or warm as you would like.

The water heater has a minimum and maximum temperature setting that you can select, but it also gives you the option of choosing a specific temperature in either Fahrenheit or Celsius degrees.






10. EcoSmart ECO 27, 27 KW at 240 Volts (Check Price on Amazon.com)


 EcoSmart ECO 27, 27 KW at 240 VoltsMake your home run more efficiently and cut down on your water heating bills with the ECO 27 from EcoSmart. Capable of working with both modern circuit breakers and older homes that use fuses, this model can provide one application with lots of hot water or handle two applications at once. Not only is the ECO 27 99.8% efficient, but it can slash your water heating bills by half.

Compact in size, this model can help you save on space too because it takes up several cubic feet less than standard hot water heaters do. All the parts inside use either stainless steel or copper that won’t rust and will last for years. All those parts are easy to replace when your unit needs serviced too.






The Winner Model is …


EcoSmart ECO 36 36kw



The EcoSmart ECO 36 36kw 240V ( Check On Amazon.com )  is the perfect electric tankless water heater for many homes because it is up to 90% smaller than traditional models and can bring down the cost of your water heating bills in just one month. A digital temperature control offers more freedom in regards to temperature settings because it lets you adjust the temp by a single degree at a time. The ECO 36 is also easy to use and has a dial for changing the temperature that also functions as a button for selecting between Fahrenheit and Celsius degree settings.