10 Best Whole House Electric Tankless Water Heater for Your Home (2023)

Hot water is something we need everyday to live comfortably at home. For that, if you have a whole house tankless water heater installed, you’ll not have to worry about this at all! So, if you’re looking around for one, then we have the best whole house electric tankless water heater article for you! From our tankless water heater reviews you can find multiple products and choose the perfect fit for your home, while also learning all about whole house water heaters.

10 Best Whole House Electric Tankless Water Heater Comparison Table

EcoSmart Eco 27GPM: 6.5 Gallon Per MinuteCheck Price on Amazon
Stiebel Eltron Tempra 24 PlusGPM: 4.5 Gallon Per MinuteCheck Price on Amazon
Rheem RTEX 13GPM: 3.2 Gallon Per MinuteCheck Price on Amazon
Bosch WH27 Tronic 6000 CGPM: 3.5 Gallon Per MinuteCheck Price on Amazon
Marey Eco 180GPM: 4.4 Gallon Per MinuteCheck Price on Amazon
Rheem RTEX 24GPM: 5.9 Gallon Per MinuteCheck Price on Amazon
Stiebel Eltron 224199GPM: 5 Gallon Per MinuteCheck Price on Amazon
Eemax EEM24018GPM: 3.5 Gallon Per MinuteCheck Price on Amazon
Marey Eco150GPM: 5 Gallon Per MinuteCheck Price on Amazon
SIO Green IR260 POUGPM: 1.5 Gallon Per MinuteCheck Price on Amazon

So, now that you know the top 10 products for whole house electric tankless water heaters, let’s look into why we think these would be great for you!

Top 10 Best Whole House Electric Tankless Water Heaters

EcoSmart ECO 27, Electric Tankless Water Heater

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We’ve looked at more than a few different water heaters, and we have to say that the EcoSmart ECO 27 Electric Tankless Water Heater trumps every other product and rises to the top with ease. Why is this the best tankless water heater? Well, it is built to a convenient size, making it easy to place wherever you need it in your home. You won’t even be wasting energy with this heater, as it turns on only when in use, making it very energy efficient.

When it comes to efficiency, the EcoSmart ECO 27 itself is built to have a maximum flow rate of 6.5 GPM, making it a very easy choice for both small and large homes. The mechanism of this machine is also very seamless, allowing it to provide you with hot water on demand, without having the need to store it up beforehand. It also comes with a temperature display, letting you make sure that the water temperature meets your needs, especially because you can set the water temperature to what you want it to be. 

Overall, the EcoSmart ECO 27 Electric Tankless Water Heater is our choice for the one of the best electric tankless water heaters out there, and you’ll find its features to be extremely helpful around the house. It’s also key to know that the heater’s parts can be easily replaced, as they are easy to find. The drawback on this unit is that the parts do corrode a little easily, compared to other models, which can be quite bothersome. 


  • Save 50% on your water heating cost
  • Designed with copper and stainless steel
  • Temperature can be controlled to 1 degree Celsius
  • Parts can be replaced very easily


  • Some parts can corrode easily

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Stiebel Eltron Tempra 24 Plus, Electric Tankless Water Heater

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Our next product is the Stiebel Eltron Tempra 24 Plus, and this also comes with a very convenient and stylish build, allowing you to install it in your house at your own convenience. It won’t get in the way of anything else with its compact build, ensuring you don’t have to make too many changes for it.

The Stiebel Eltron Tempra Plus also is very convenient for your household with a flow rate of 4.5 GPM, allowing you to do multiple things in your house that utilizes hot water. You’re also not going to feel any increase in your electricity bills, rather you’ll see it decrease in the long run. This unit is optimized to ensure that the water heater makes your hot water needs efficient, and will decrease the bills for your water heating needs. Of course, it also includes a digital temperature display, making sure you know exactly what the water temperature is, and also lets you choose it yourself. 

Overall, the Stiebel Eltron Tempra Plus is definitely a contender for one of the best electric tankless water heater for whole house, and will surely take care of all of your hot water needs. It’s also good to know that it comes with one of the best warranties, that will ensure you won’t be burdened with repair costs. However, it does have its drawbacks. The heating capacity for this water heater decreases after a few years, and some customers have claimed that its circuit break often trips, which can be quite a nuisance.


  • Offers water temperature range from 68 to 140 degrees Fahrenheit
  • Sleek and durable German build
  • Has memory settings to remember your preferences
  • Silent operation


  • Water heating ability depletes after a few years
  • Can sometimes trip the circuit breaker

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Rheem RTEX 13, Electric Tankless Water Heater

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All of the models we’ve looked at so far, come with their great efficiency. The Rheem RTEX 13 doesn’t disappoint on that front either! The machine itself is quite efficient, as it doesn’t use an additional overflow line, making it quite convenient as well. This goes very well with the fact that installing it is quite easy, making it a very seamless unit to work with.

The Rheem RTEX 13 also has a temperature display and knob, allowing you to set the temperature of your hot water to what you need. On top of that, you can always keep an eye on it with the help of the display. You’ll also notice the self modulating feature, which allows you to make changes to the water heater based on your needs, which makes it easy to optimize for what you need. Rheem has also made sure that you waste as little water as possible with this water heater, with the shower head facility provided to you. 

Overall, the Rheem RTEX 13 is one water heater that you can definitely rely on, and in case of any problems, any faulty parts of this machine are easy to replace. They are a world renowned brand, and you’ll find their water heater to be extremely useful. Unfortunately, the lifespan of this water heater is where its drawback lies, as it isn’t said to last for too many years.


  • Comes with a self modulating power control system
  • 99.8% energy efficiency
  • 3.17 GPM makes it great for point of use application
  • 1.5 GPM with shower head facility


  • Has a shorter lifespan than others

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Bosch WH27 Tronic 6000 C, Electric Tankless Water Heater

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Next up, we have a water heater from Bosch, who are a very well known brand around the world. Their product, the Bosch WH27 Tronic 6000 C tankless water heater, is a durable unit, and it can last you up to 20 years once you’ve bought it! That makes this a very worthwhile investment, especially when you take into consideration its affordable price as well.

The Bosch Tronic 6000 C not only lasts you for a long time, but with its very good flow rate of 3.5 GPM. The unit itself is also very functional, and users have found it to be a very easy to install model, making it all the more convenient. The installation itself is also easy, along with the fact that the unit itself is small and compact, allowing it to take up a very small amount of space in your home. A very useful feature that Bosch have implemented is the ability to always be able to check the water flow inside the mechanism, with the help of the built-in sensors.

Overall, the Bosch Tronic 6000 C is definitely one that you should keep your eyes on, with its long lifespan and ease of use. It will easily prevent corrosion with its build, and allow you to have good quality of hot water for years to come. Unfortunately, a few users have reported their unit to trip up the circuit breaker, which can be quite a bother to deal with.


  • Affordable
  • Has 97% thermal efficiency
  • Very easy to install and is a small unit at 19.5 pounds
  • Polymer encased elements and sensors allow for consistent temperatures


  • Can trip up the circuit breaker sometimes

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Marey Eco 180, Electric Tankless Water Heater

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The next product we have is the Marey Eco 180, and this comes with a sleek metal build, making it quite flashy. The unit is said to be efficient, and in the long run, can save you a lot of money when it comes to your water heating needs. 

The Marey Eco 180 also has a digital interactive display, and this lets you view the temperature of the water as it comes through. You’ll also be able to set the temperature to whatever you desire with this display. The 4.4 GPM flow rate allows for point of use or whole house application for your house. In comparison to other units as well, this Marey water heater draws a lower amount of electricity, making its consumption low as well. 

Overall, the Marey Eco 180 is a product you want to look out for when it comes to the best tankless electric water heater for the whole house. It will save you electricity when being used. It does have a drawback though, which is the fact that it needs to be set up by professionals, as it requires 2 50 amp breakers.


  • Stainless steel water channel
  • Has built-in smart technology
  • Uses 60% less electricity
  • Has patented heating technology


  • Hard to install and requires professionals

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Rheem RTEX 24, Electric Tankless Water Heater

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Next up in our quest to provide you with the best electric tankless water heater we have another Rheem product, and this one is the Rheem RTEX 24. This is also another great option when it comes to saving space in your home while still building a very efficient and optimized water heater. You’ll be able to choose a very convenient place to install this water heater, and not be bothered by it being there!

The Rheem RTEX 24 also has a good water flow, which comes in at 5.9 GPM. This unit will be able to sustain multiple appliances at the same time, while meeting the demand for your desired water temperature. That brings us to the point of its LED display with adjustment knobs, letting you choose the desired water temperature for your home. You can easily set it up, and then always have easy access to see what the water temperature is at any point. It is also an energy efficient model, ensuring you don’t waste power at your home, since electric water heaters are known for great efficiency. It operates on a 100 amps, and requires 3 double pole 40 amp breakers. Any household with 150 amps of power can easily run this uni. 

Overall, the Rheem RTEX 24 can prove to be a great asset at your home, and can be a worthwhile investment. Your need for hot water will be met by this unit’s ability to provide it to your whole home with ease. The one downside for this water heater, is the fact that it does take around 10/15 seconds to heat up the water once it’s turned on. However, you do get a seamless flow of water at the desired temperature afterwards.


  • Unit is 99.8% energy efficient
  • Good durability with brass top
  • Copper immersion elements make it efficient
  • LED display is accurate to 1 degree fahrenheit temperature rise or decrease providing great temperature control


  • Takes the machine 10/15 seconds to warm up at first

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Stiebel Eltron Tempra 224199, Electric Tankless Water Heater

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We have another Stiebel Eltron product up next in our list of tankless water heaters reviews, and it is the Stiebel Eltron 224199. This unit is another very durable water heater, making it last for years on end with minimal problems and need for repairs. This works even better with Stiebel’s use of very high quality electronics and building materials

The 224199 Stiebel Eltron Tempra Plus has a digital display, making it easy for users to set and view the incoming water temperature. It’s also designed to ensure that you can easily install this water heater anywhere in your house. This hot water heater also boasts advanced technology which includes a self modulating system which helps in conserving energy. It also includes an advanced flow control to help regulate the water flow inside the water heater automatically, helping with temperature control. The lack of any heat loss will also ensure you get the correct temperature for your water, and that there aren’t many chances for mistakes to happen. 

Overall, the Stiebel Eltron 224199 is definitely up there as one of the prime contenders for the best tankless water heater out there on the market. Its 5 GPM flow rate also makes sure that you can always satisfy your demand for hot water. The drawbacks for this unit are that it is quite tedious to install, and also requires some heavy wiring to function.


  • Great durability with seismic protection
  • Reduces water heating bill by 15-20%
  • Self modulating technology makes it 99% energy efficient
  • Constant temperature with help of advanced flow control
  • 5 GPM


  • Requires heavy wiring
  • Hard to install

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Eemax EEM24018, Electric Tankless Water Heater

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The Eemax EEM24018 is the next one in our list, and this product is also built for the convenience of the user. You can mount this on the walls of your home, and ensure that it stays out of your way, but also in a space where you can easily use it.

The Eemax EEM24018 boasts a digital temperature display with adjustment knobs, along with its impressive flow rate of 3.5 gallons per minute. You’ll be able to run multiple appliances with great energy efficiency. This is because of the self modulating mechanism that this water heater uses, and it allows for you to save energy when in use, making sure it also brings down your cost to heat the water. 

Overall, the Eemax EEM24018 is a very worthwhile investment, and users have mentioned its price to be good considering how well it works throughout the years. Also, if it matters to you, this unit is also built to look pleasing, and you can definitely see that through the image, and it is also compact! One drawback for this unit is that it works under specific house conditions, and you’ll need to make sure that your home fits the criteria.


  • Provides hot water with a temperature range from 80 to 140 degrees fahrenheit
  • Temperature control allows for changes with 1 degree increments
  • Stainless steel build for durability
  • Self modulating technology keeps track of how much energy needs to be used


  • Requires specific criteria to fit in a house

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Marey Eco150, Electric Tankless Water Heater

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We have another Marey Eco water heater, and this is the Marey Eco150.The 5 GPM flow rate makes it easy to operate in any household. It’s also energy efficient, as it has a very low amperage draw, which costs you less power in operating it. Depending on where you are, it can be used for point of use or whole house application.

The Marey Eco150 is already a great whole house tankless water heater with its high gallons per minute flow rate. This is made even better with the flow switch activation mechanism, which makes keeping your water warm much easier, and also makes it much more convenient to use over time. If you want to keep track of the water temperature at any time, you can do that easily with the help of the LCD screen. You can also use this to set the water temperature to your desired setting, without any issues. 

The Marey Eco150 hot water heater is definitely one you ought to keep in your list for choices, as customers have reviewed this to be a very efficient and easy to use water heater. It even comes with a sleek design to ensure you can be pleased with wherever you place it in your home. The one drawback of this unit is that it is hard to install, and requires professional installation.


  • Has stainless steel build for durability
  • LCD screen and adjustment knobs built-in
  • Has flow switch activation mechanism
  • Has ETL approval


  • Needs professionals to have installed

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Sio Green IR260 POU, Electric Tankless Water Heater

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The last water heater in our list of tankless water heaters reviews, is the Sio Green IR260 POU. This uses a very innovative form of power to heat the water in your home, which is infrared rays. The method has proved to be quite useful, as it uses quartz and eliminates the risk of any corrosion or mineral buildup occurring in your unit. 

The Sio Green IR260 POU water heater has a maximum flow rate of 1.5 gallons per minute, which will allow it to drive hot water with point of use application. You can easily run an appliance in your home without any issues, and with a constant flow of hot water. The digital display along with adjustment settings on the front of the unit, also makes it quite a convenient water heater to have. You’ll also find that the mechanism for this water heater is very efficient, and that it does not increase your bills to an unnecessary rate. The design of this model is also quite convenient with its small and compact size, allowing you to have it installed anywhere you want in your house.

Overall, the Sio Green IR260 POU is definitely one of the more innovative tankless water heaters out there, and one that could easily fit your home. This 240V water heater unit is quite a unique one to get for your home, which could simplify the water heating needs in your home. The drawback with this unit is that since it has a low flow rate, it can really support only one appliance at a time, or very small homes. 


  • Uses innovative quartz tubes for heating with infrared
  • Usage of quartz eliminates risk of mineral buildup
  • Does not require any maintenance
  • It uses recyclable materials


  • Usable for small homes or minimal appliances

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Which Size Of Tankless Water Heater Is The Best for A Whole House?

When it comes to choosing the best whole house tankless water heater, you’ll need to factor in the most important thing; the size of your home, and the number of people using hot water. You’ve seen us mention the flow rate in each of the tankless water heater reviews. That is because, this signifies how efficient a water heater is when supplying hot water all over your home.

You’ll want an electric tankless water heater with a high GPM, so that it can supply hot water to multiple appliances and rooms around your house, without compromising on the desired temperature of the water. However, you’ll also have to take into account the fact that the higher the flow rate, the more electricity it will consume. So, always make sure to have the right size for your home, otherwise you’ll either lose out on hot water or money.

Factors to Consider When Buying Whole House Electric Tankless Water Heater

We’ve already explained the most important thing to keep in mind when you want a whole house tankless water heater, but what about the features of this type of water heater? Well, let us delve into these features just so you’re fully aware about everything when it comes to knowing everything about your best electric tankless water heater for the whole house.

Long Lifespan

When it comes to whole house electric tankless water heaters, you’ll find that their lifespan is usually much longer than any other form of water heater. They are expected to last almost 20 years with proper functionality, whereas other types of water heaters usually last up till 15 years.

Small and Compact Sizes

Despite these whole house electric tankless water heaters being designed to provide hot water all throughout your home, they are usually very small and compact in size. Not only does this bode well for installation in your house, but it is also very convenient to use. You don’t have to bother storing this away in your basement or attic, rather you can just install it in a corner in your kitchen or under the sink!

The space saving features for whole house electric tankless water heaters are even more prominent because of the fact that they are tankless, which saves you the hassle from having to need a tank to heat your water. 

Longer Waiting Times

Since a whole house tankless water heater is designated the task to send water all throughout your home, you’ll have to understand why it may take a couple of minutes for the hot water to reach all the way throughout your house. The water has to go through the unit, and then make its way around the house. However, you will at most have to wait a couple of minutes when it comes to the waiting time, so it isn’t the end of the world really. 

Cost Efficiency

Using whole house electric tankless water heaters are actually much more cost efficient than having multiple point of use electric tankless water heaters throughout your house. This is because you’ll technically have only one water heater which is consuming electricity, and even though it is more than the other tankless water heaters, in the long run the whole house tankless water heater will be much more efficient in reducing your water heating bills.

Video Credit: Scott Gregg


Q. What is the best whole house electric tankless water heater?

From our article on tankless water heater reviews, you can see that the best whole house electric tankless water heater in our opinion, is the EcoSmart Eco 27. It boasts some amazing features which helps it become optimal and also very convenient to use on a regular basis.

Q. Is an electric tankless water heater worth it?

Yes, they are! Electric tankless water heaters are very efficient and the tankless water heaters themselves are optimized to be very energy conservative, helping them reduce your overall cost in the long run.

The Takeaway

We hope you managed to go through our article and find the best whole house electric tankless water heater for yourself. There’s a lot of different factors that should go into it when you’re trying to make the right decision with electric water heaters, so make sure you think it through properly! The best electric tankless water heater will be efficient and also provide you hot water on demand without too long of a waiting time. Not to mention, you’ll also need to keep in mind the different flow rates for different weathers. So good luck in finding the best electric tankless water heater out there to meet your hot water demand!