Electric Water Heaters are fast becoming an essential product in household water heating. They are easier to install than gas tankless water heaters and much cheaper in the long run, especially with electricity prices being far more stable and consistent than gas prices for obvious reasons. 

Electric tankless water heaters use electricity to heat the incoming flow of water. In a nutshell, cold water flows into the pre-heated water heater that maintains a consistent temperature which is pre-set by you via the devices control panel, often using an energy smart water heater control board. For the most part they are much smaller than traditional tank heaters and even smaller than the best tankless gas water heater you will find.

An electric unit will also be safer, have a longer lifespan and require less maintenance. They usually call for a larger initial investment however you will see a much better return due to their very high energy efficiency ratings. Usually a family of three will only need a single unit to meet their daily water requirements without having to make compromises in the form of only using one application at a time for example.

Due to the size of the associated initial investment, ensuring you make the ​best purchasing decision is not something to be taken lightly. Make the correct purchase and you could save yourself thousands of dollars over time, however do the opposite and you could have a very expensive mistake on your hands.

We have carried out extensive research into this product category via Amazon 2017 and have compiled a list of electric hot water heater reviews. As a result of electric tankless water heaters being more complex than their counterparts we have added some additional feature breakdowns into our best electric water heater review.

Have a read through our electric hot water heater reviews below and check out the quick comparison table to gather some info on each product and match it to your own individual requirements. Once you have armed yourself with this information then you can be sure you are making the correct decision for you.




99.8% EER

99% EER



**EER = Energy Efficiency Rating**

best electric water heater review


Eco Smart are a pioneer in the field of tankless water heaters and the 27 may be their best product to date. They are continually implementing innovative and cutting edge technologies into their products such as eco smart LED and energy self-modulation, which enables your water heater to regulate exactly how much energy is needed for the amount of water being used.

Over time this is a high efficiency electric water heater that could save you up to 50 percent on your water heating costs. Their units are also compact and wall-mountable meaning they can be installed in pretty much any home, even when space is at a premium. Also, as of right now they are the only company that offer a lifelong warranty on their tankless water heaters.

The Eco 27 is maybe the best unit of its kind you will find. However the bigger size is also what makes it one of the best and most powerful units on the market. This makes it ideal for those of you living in colder climates where water temperatures can be very low, particularly in winter months which means your heater will have to work harder.

It can easily heat water for 2 simultaneously running showers without having to concern yourself about hot water levels running low. In warmer regions it can easily handle high-demand households up to a very impressive 6GPM, allowing you to use showers, sinks and even a dishwasher at the same time. It sports a digital control for temperature regulation in increments as small as 1 degree making it a highly functional model.

It can easily heat water for 2 simultaneously running showers without having to concern yourself about hot water levels running low. In warmer regions it can easily handle high-demand households up to a very impressive 6GPM, allowing you to use showers, sinks and even a dishwasher at the same time. It sports a digital control for temperature regulation in increments as small as 1 degree making it a highly functional model.

EcoSmart are known for releasing extremely reliable tankless water heaters. Have the 27 installed by a professional and it should last you years and years to come. 

Best For:

  • Large families and those who live in colder climates


  • KW: 27
  • Voltage: 240
  • Dimensions: 17 x 17 x 3.75
  • Exchanger: Copper
  • Temperature control: Digital:
  • Activation flow: 25 GPM
  • Energy Efficiency: 99.8%
  • Warranty: Lifetime

At a Glance:

  • Save up to 50% on energy costs
  • Advanced self-modulating technology
  • Stylish design
  • Ultra precise 1 degree increment temperature control
  • Highly durable and easily replaceable parts
  • Compact size
  • Ideal for colder climates
  • Easy installation
  • Eco smart LED lighting display
  • High efficiency electric water heater


  • check
    Internal jumpers limit water heating temperatures for maximum safety
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    Capable of heating up to 3 gallons of water per minute, even in extremely cold climates
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    Lifetime Warranty

stiebel eltron tempra 24

Along with EcoSmart the other giant of this industry is Stiebel Eltron and the Tempra 24 is without doubt a high efficiency electric water heater and every bit as advanced as the EcoSmart 27. Recently Stiebel overhauled their entire engineering process, redesigning their electric water heaters from the inside out to tremendous success. 

The Tempra 24 features a simple single flow sensor design and an easily accessible internal system due to hinged cover feature. This unit is more than capable of saving you up to 20-30% KWH which is outstanding due to Stiebel being hyper focussed on energy efficiency. 

It features a simple command interface allowing you to easily adjust flow rate. This tankless water heater exemplifies its product category, excelling in areas of energy efficiency, space saving capability and cutting edge, innovative technology.

This tankless water heater operates sequentially meaning the only internal parts working are those required at that specific moment, which combined with the fact it utilises no mechanical switches or components results in near operational silence. This is in comparison with less efficient tankless water heaters which can have multiple, analogue parts functioning at any given time resulting in a considerable amount of noise.

Stiebel have been developing tankless water heaters and associated technologies for almost 90 years now so you can have unwavering confidence in their products. They truly are pioneers in this industry with a strong tradition of excellence, meaning you can rely on them for performance and reliability and happily install their products in your home.

Best For:

  • High hot water demand residences


  • KW: 24
  • Voltage: 208/240
  • Dimensions: 21.5 x 19.5 x 8.8 
  • Weight: 15.4 Lbs
  • Temperature Control: Digital
  • Energy Efficiency Rating: 99%
  • Warranty: 3 years

At a Glance:

  • Save 15-20% on your energy bills
  • Digital temperature control
  • Sleek and compact design
  • Recipient of "Amazon's Choice" award
  • Highly accurate temperature regulation
  • Proven reliability


  • Industry leading energy efficiency
  • Cutting edge engineering and design
  • Compact construction
  • Best in class demand to delivery times and flow rate

rheem rte 13

Founded in 1925 by brothers Richard and Donal Rheem in California, the Rheem manufacturing company began life producing various products for a number of different industries from household appliances to shipping. Over the years they have niched down in an attempt to create the best product that they possibly can. Quite impressively, they are the largest manufacturer of water heating products in North America. 

As mentioned above they are a leading brand in the on demand electric water heater industry and one unit in particular clearly shows why. The RTE 13 is an outstanding Rheem electric tankless water heater and has proven to be wildly popular, being used in homes, apartments, offices, condos, labs and even on boats.

This tankless water heater boasts modulating technology which ensures that only the exact amount of energy required is utilised at any given period of water demand making it ideal for single shower applications. The unit sports a great compact design with a highly precise on-board temperature control and also features an LED status light to indicate 'Active' and 'Standby' modes.

This Rheem electric water heater is a very impressive electric tankless water heater indeed. It is a no frills model that does exactly as it says it does. It boasts a sleek, compact design and an extremely easy to operate interface due to its on board temperature control located on the front of the unit. One of the best features of the RTE 13 is its unrivalled energy and money saving capability due to its advanced self-modulating technology.

Best For:

  • Smaller families and 1 or 2 person residences


  • Voltage: 240 
  • KW: 13
  • Dimensions: 7.2 x 7.2 x 7.2
  • Weight: 7.3 Lbs
  • Energy Efficiency: 99%
  • Analog controls

At a Glance:

  • Temperature control unit - Temperature regulation really could not be easier thanks to the highly precise on board controls.
  • Power Modulation - This technology ensures the unit will only draw power during water demand periods. Also units equipped with this technology heat water fast and more efficiently than non-modulated unites for excellent energy and cost saving capabilities.
  • No ventilation required - As no ventilation is necessary it can installed anywhere within reason without having to be concerned about external building access for ventilation pipework.
  • Best in class space saving capability - With its impressive compact design the Rheem RTE 13 can be installed practically anywhere that your water source is accessible from. As well as being a real space saver it boasts near silence during operation.
  • Easy to install - The RTE 13 is famously easy to install and it should be doable yourself. However it is worth noting that you may not qualify for the Rheem warranty scheme if your unit is not installed by a licensed professional.
  • Energy efficiency - With no stand by energy loss it will save you a considerable amount on your energy bills.


  • Self-modulating technology
  • Excellent energy efficiency rating
  • Brilliant money saving capability
  • A great small tankless electric water heater

stiebel eltron dhc-e12 e series

Stiebel Eltron are a name synonymous with exceptional engineering which has resulted in them producing an exceptional product according to countless consumers. The units they produce are always and without fail highly functional and replete with impressive features. Over the last couple of decades tankless heaters have replaced the traditional tank heaters and Stiebel are one of a handful of companies who have been at the forefront of this transition.

The DHC-E is an instantaneous water heater meaning it will provide you with hot water at the push of a button. It is wall-mountable and boasts a super simple plumb in/out unvented installation capability so it can be installed anywhere in the home near a sink or shower. 

It sports full thermostatic temperature control for high precision temperature regulation via an easy to use dial located on the front exterior of the unit. This dial can set temperature between 86-140 degrees F. All plumbing and electrical connections are located at the bottom or rear of this model for maximum safety and a neat and tidy construction.

This tankless electric water heater is a powerful and flexible point-of-use solution. The DHC-E offers 12 KW's of output in an affordable, compact package. Perfect for high demand or multiple low demand requirements.

Best For:

  • Smaller families with a medium lever hot water demand


  • Voltage: 240
  • KW: 12
  • Flow rate: 1.5 GPM
  • Indoor certified only
  • Wall-mountable
  • Dimensions: 4.1 x 7.9 x 14.2
  • Weight: 6 Lbs

At a Glance:

  • Advanced microprocessor control system
  • Excellent warranty scheme
  • Easy code compliance
  • Zero scalding due to thermostatic temperature control system
  • Simple plumbing design
  • Compact construction
  • Seismic proof build
  • Good energy efficiency rating


  • Energy saving capability - You could start to make your initial investment back after 12 months.
  • Install without having to worry about ventilation access.
  • Very powerful for such a compact unit
  • Very precise temperature control

ecosmart 8kw

The 8KW is another release from EcoSmart that and has been marketed as a “whole home” model.  It is best suited to those households with a single bathroom in climates with an incoming water flow temperature of 67 degrees F and above. It is capable of heating nearly 1.5GPM to temperatures of 105 degrees F.

The very impressive digital interface allows you to regulate temperature in increments as low as 1 degree. The 8KW can also be used in colder climates as a point-of-use water heater for sinks or other low-flow applications. When sized correctly this tankless water heater will provide you an endless flow of hot water and will only consume the energy it needs to heat it up, giving you full control.

The self modulating technology means the EcoSmart 8KW will adjust its energy output to the amount of hot water required at any given time. This in no small part adds to its ability to save you up to 50% on your water heating bills.

Best For:

  • Small family households


  • Voltage: 240
  • KW: 8
  • Exchanger: Stainless steel
  • Temperature control: Digital
  • Flow rate: 1.5 GPM
  • Energy Efficiency: 99.8%
  • Dimensions: 12 x 9.5 x 4
  • Weight: 4.8 Lbs
  • Warranty: Lifetime

At a Glan​ce:

  • Can save you up to 50% on your water heating costs
  • Advanced self-modulation technology
  • Stylish design
  • Temperature control in as little as 1 degree increments
  • Stainless steel components for maximum durability
  • Compact design and build
  • Lifetime warranty


    • Self modulating technology 
    • Sleek and compact
    • Temperature control in 1 degree increments
    • Excellent small tankless electric water heater

buyers guide 


It is a unit that draws power by way of electricity to heat the water in your home when required. It is often installed near a water drawing application such as sink, shower or bath and can heat water on demand to temperatures which are pre-configured and within ranges determined by each tankless water heater model.


The main difference is that these types of tankless water heaters draw power from an electrical source whereas other kinds of units tend to be gas/propane operated. Another key difference is that due to being electric models they do not require an accompanying ventilation system.

This is a big advantage which means they are much more compact in design, wall-mountable and highly flexible in terms of where they can be installed in the home. The best electric tankless water heater will tend to be more technologically advanced than its counterparts, using an energy smart water heater control board, which is why we added additional feature breakdowns above.


There is no simple, 'one size fits all' answer to this question. Every consumer has their own individual circumstances and requirements and a great place to start would be to identify your own specific needs in this area.

The most important thing to do when selecting the best electric tankless water heater is to understand your water demand. Do you have a family or do you live alone or with a partner? If you do have a family is it large or small? Do you require hot water for multiple applications throughout your home simultaneously or are you a single use residence? Asking yourself these kinds of questions is the very best way to get started.

If you have a large family with high demand then look specifically for high demand units, the first 2 models on our list above should more than meet those requirements. However if you are a smaller family or live alone or with a partner for example then you must search for a small tankless electric water heater designed for low-medium demand operations, this will ensure you keep your energy efficiency at the optimum level. The latter 3 heaters on our list above should be of interest to you if you fall into this category.

This is your starting point. Take this information and combine it with other factors such as your budget, the climate you live in, installation space, our electric hot water heater reviews above and anything else you can think of. By doing this you will be well on your way to finding the best electric tankless water heater for you.


What does an electric tankless water heater cost is a very common query among consumers, particularly if they have little experience of these units in the past.

The cost will vary from product to product to product depending on various different factors. Usually what impacts price the most are things like the power of the unit, its flow rate, the professionalism of its design and engineering and also the technology that has been integrated into it. 

Of course a common mistake that many people make is to only look at the electric tankless water heater cost and ignore installation costs. Install costs can be quite a large amount so be sure to add both together to get a true reflection of the size of your required investment.




You really cannot go wrong with EcoSmart, their products are of the highest quality and extremely reliable.

The EcoSmart 27 is the best tankless electric water heater, a highly advanced and powerful unit capable of handling high demand hot water requirements for large families, multiple simultaneously running applications and even very low climates and the resulting incoming water temperatures.

Also with a lifetime warranty the EcoSmart 27 is the ultimate choice to meet the hot water needs of you and your family.



Stiebel Eltron are another highly respected company within the industry who release product after product of the highest calibre.

The DHC-E is an ultra compact unit with a sleek design meaning it can be installed pretty much anywhere in the home within range of hot water drawing applications. Yet do not let its size fool you as this is an extremely powerful unit with an outstanding energy efficiency rating.

Compact and efficient it is perfect for low demand residences. Combining convenience with power, energy efficiency and money saving capabilities.


Selecting the best electric model can be slightly more difficult than a gas operated unit in some ways due to the added technology and smaller, yet higher quality number of products on the market. With the world turning towards renewable energy and away from fossil fuels more and more every day, electric water heaters really are the way to go.

As with other types of water heater and like we stated above in our best electric water heater review you must ascertain your specific hot water requirements. This is your foundation and when combined with your other individual determining factors and the information we have provided above you should be well on your way to selecting the best unit for you.