Electric tankless water heaters are the future of household water heating. They are easier to install than their gas counterparts and are much cheaper in the long run, especially with electricity prices being far more stable and consistent than gas prices for obvious reasons. 

Electric 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. For the most part electric models are much smaller than traditional tank heaters and even gas powered tankless water heaters.

Electric units are also safer, with a longer lifespan and require less maintenance. They usually require a larger initial investment however you will see a much better return on investment 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 water source at a time for example.

Due to the size of the associated initial investment, making the right 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 and have compiled a list of what we think are the top 5 models on the market right now. Have a read through our 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 and getting the best electric tankless water heater for you.







99.8% EER

99% EER

99% EER

99% EER

99.8% EER






**EER = Energy Efficiency Rating**



Eco Smart are a pioneer in the field of electric water heaters. They are continually implementing innovative and cutting edge technologies into their products such as 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 model that could save you up to 50 percent on your water heating costs. Their units are also compact and wall-mountable meaing 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 products.

The Eco 27 is one of the larger electric tankless water heaters you will find. However this bigger size is also what makes it one of the 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 6 gallons (or 23 litres) per minute, 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 products, have the 27 installed by a professional and it should last you years and years to come. 

Ideal For:

  • Large families and those who live in colder climates


  • KW: 27

  • Voltage: 240

  • Dimensions: 17"H x 17"W x 3.75"D

  • Weight: 13.75 lbs (6.2 Kg's)

  • Exchanger: Copper

  • Temperature control: Digital

  • Activation flow: 25 GPM

  • Energy Efficiency: 99.8%

  • Warranty: Lifetime

Let’s take a quick look at some of the main features of the Eco 27.

Key Features:

  • Save up to 50% of energy costs

  • Advanced self-modulating technology

  • Stylish design

  • Ultra precise 1 degree increment temp control

  • Highly durable and easily replaceable parts

  • Compact size

  • Ideal for colder climates

  • Easy installation

All these features make the Eco 27 unequivocally one of the best electric tankless water heaters on the market right now. 


  • Easy to clean and maintain, all that is required is a phillips screwdriver and a little spare time
  • Once installed by a professional you will qualify for EcoSmarts lifetime warranty
  • Internal jumpers limit water heating temperatures for maximum safety
  • Capable of heating up to 3 gallons of water per minute, even in extremely cold climates

stiebel eltron tempra 24

Along with EcoSmart the other giant of this industry is Stiebel Eltron and the Tempra 24 may be their finest moment, which is 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 sucess. 

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 unit exemplifies electric heaters, excelling in areas of energy efficiency, space saving capability and cutting edge, innovative technology.

Ideal For:

  • Large families with high hot water demand


  • Voltage: 240

  • KW: 24

  • Energy efficiency: 99%

  • Digital Temperature control

  • Maximum temperature increase: 92 degrees Fahrenheit

  • Weight: 15.4Lbs or 7kg

  • Dimensions: Width: 16 5/8 Height: 14 1/2 Depth: 4 ⅝

  • Warranty: 3-7 years

Key Features:

  • AFC (Advanced Flow Control) which automatically adjusts flow rate

  • Unlimited on demand hot water

  • Compact, space saving design

  • Highly precise temperature control

  • Three year warranty

  • Seismic proof construction

  • Digital display

  • Thermostatically controlled

  • Proven reliability

  • Can save you to 30% on your water bills

The Stiebel Eltron Tempra Plus will cost you no more than a regular water heater yet you will have a far superior product, also installation will be inherently cheaper due to it being an electric model. Product lifespan is another huge bonus with this unit, high quality, professional, German engineering means this thing is built to last.

A common feature in most homes is a large and cumbersome tank heater located in the basement or in a dedicated closet. Naturally these take up vast amounts of space, have notoriously low energy efficiency ratings, poor flow rates and slow demand to fulfilment times. The Tempra 24 is extremely powerful meaning it can offer hot water on demand. Also due to its compact design it can be installed anywhere in the home, most importantly this means it can be installed closer to your water mains for even faster delivery.

Stiebel’s Tempra 24 boasts one of the most technologically advanced flow sensors of any model available. The purpose of this feature is to feed readings into the main unit’s proprietary microprocessor control resulting in fast and supremely accurate temperature regulation. The heater constantly monitors incoming and outgoing flow rate meaning you get exactly the amount of water you need at the temperature you want it at and no more. This intelligent central processing system is the key to the units industry leading energy efficiency. 

The unit 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 heaters which can have multiple, often analogue parts functioning at any given time resulting in a considerable amount of noise.

Stiebel have been developing 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.


  • Industry leading energy efficiency
  • Cutting edge engineering and design
  • Compact construction
  • Best in class demand - 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, specialising in the areas of heating, cooling and water heating. Quite impressively, they are the largest manufacturer of water heating products in North America.

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

Boasting modulating technology it 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.

Ideal For:

  • Smaller families and 1 or 2 person residences


  • 240 Volts

  • 13KW

  • Dimensions: 7.2 x 7.2 x 7.2 in

  • Weight: 7.3 pounds or 3.3 kg

  • Energy efficiency: 99%

  • Analog controls

Key Features:

  • Temperature control unit - Temperature regulation really could not be easier thanks the very accurate 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 faster and more efficiently than non-modulated units for excellent energy and cost saving capabilities.

  • No ventilation required - As no ventilation is necessary it can be installed anywhere without having to be concerned about external building access.

  • 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 operational silence.

  • 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 Rheem's warranty scheme if your unit is not installed by a licensed professional.

  • Energy Efficiency - With no standby energy loss this unit can save you considerable amounts on your monthly energy bills.

The Rheem RTE 13 is a very impressive 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. The real outstanding feature of the RTE 13 is its unrivalled energy and money saving capability due to its advanced self-modulating technology.


  • Self-modulating technology
  • Excellent energy efficiency rating
  • Brilliant money saving capability

stiebel eltron dhc-e12 e series

The engineers at Stiebel have come up with a series of electric tankless water heaters that are very famous for being top performers both in functionalities and features. Over the course of the last few decades, electric tankless water heaters have taken the place of the old conventional big water heaters with huge tanks. That happened because tankless water heaters are better in almost any aspect and are advantageous in many ways both to you and your wallet. What has become popular in recent years is the Stiebel Eltron DHC-E12 E Series and it has taken everybody's hearts. By being an on-demand water heater, the DHC-E tankless water heater is extremely energy efficient as well. A complex water flow sensor recognizes when hot war is being used and when you aren’t using any, so the unit will activate and deactivate itself automatically based on whether it is being used. Running only when you are actually using water eliminates standby thermal heat losses associated with traditional tank type water heaters. Thus you will see a significant difference in your electricity bill over the time.


  • 240 Volts

  • Temperature range: 86-125 Degrees Fahrenheit (or 30 to 51 degrees Celsius)

  • Flow Rate: 1.5 GPM

  • Indoor Use Only

  • Wall-Mounted

  • Dimensions: 4.1 x 7.9 x 14.2 inches

  • Weight: 6 pounds (2.7 kg)


  • Advanced microprocessor control system

  • Best warranty in today’s market

  • Easy code compliance

  • Zero scalding

  • Simple plumbing system design

  • Sleek design which fits anywhere

  • Seismic proof construction

  • Reliable performance

  • Energy efficient

This tankless electric water heater is powerful, flexible and a point-of-use water heating solution. The mighty DHC-E 12 offers you a high output of 12 kW, coming in an affordable, compact package. It is amazing for your kitchen sink or for multiple low-flow sinks in a commercial application.


Energy Saver. It is known that this model saves a lot of energy and brings down your electricity bill, so with this water heater your initial investment will be covered within the first few years.

Pioneer at the technical front. It comes with high tech facilities and features that ensure you will enjoy excellent utility on a daily basis. All that you need to do is set the knob at the front panel on a desirable temperature and you will have a constant hot water supply provided instantly.

Easy to Use. It can be easily installed and/or wall-mounted. People mostly use it for cottages and seasonal cabins, as it requires no technician for the installation and can be done by a single person in a few hours. Once its set it will surely provide you and your family with hot water without any interruptions.

All of the DHC-E12 features along with its unique for the market 3 years parts warranty will ensure you have a smooth ride when it comes to having hot water into your household or business. When it comes to choosing the best electric tankless water heaters, Stiebel is always a solid choice.

ecosmart 8kw

Last but not least on our list for the best electric tankless water heaters in the world is the EcoSmart 8kW model. This water heater is configured as a “whole home” model for households with one bathroom in climates where the incoming water flow temperature is 67 degrees Fahrenheit or around 19 degrees Celsius and above. It heats nearly 1.5 gallons per minute to 105 degrees Fahrenheit. Digital temperature controls allow you to set the desired temperature at increments of 1 Degree. You can also use this model in colder areas as a point-of-use water heater for a sink or other low flow application. When sized correctly this 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.


  • 240 Volts

  • 8kW

  • Stainless steel exchanger

  • Digital temperature control unit

  • 99.8% energy efficiency

  • Flow rate: 1.5 gallons per minute

  • Weight: 4.8 pounds (or 2.1 kg)

  • Dimensions: 12 x 9.5 x 4 inches

  • Lifetime warranty on electronics, exchanger and elements


  • It will save you up to 50% on water heating costs

  • This model packs the most advanced self modulating technology on today’s market, meaning the ECO 8 will adjust how much energy it needs to use based on how much hot water is required of it.

  • Pleasant to the eye stylish design

  • Control over the temperature in 1 degree increments on a digital board

  • Stainless steel and copper components resulting in efficiency, durability and easy replacements

  • Save up to 12 cubic feet of valuable storage space due to its compact size

  • Lifetime warranty

So it doesn’t matter whether you are a small household, or a local shop with a few sinks which require hot water flow, the ECO 8 is the perfect companion for your water needs. It will make sure you never run out of hot water and will almost never require maintenance other than cleaning. If you are a bigger household, though, you might want to consider getting more than one of those units, as their flow rate isn’t suited for more than 1 shower or big households.


So there we go, folks. You have your list of the best tankless water heaters in the world right now. All you have to do now is choose the one that fits your needs the most and that is in the right price range for your budget. Once again, when choosing you need to take things like size, outflow, energy efficiency, warranties into consideration, as some of the listed products have lifetime warranties and some do not. Have in mind that those water heaters will remain where you install them for some good 15 to 20 years, so it's better to plan ahead, and get one with a longer warranty. Also, don’t pay that big of attention to the initial price, as the energy efficiency rate of those electric water heaters will ensure you will save up from the electricity bill on the long run, that is a fact.

We’ve made sure that when it comes to you choosing your new tankless electric water heater you won’t have an option to go wrong. The products we listed are the top of their game and their is no right or wrong with them, it's only a matter of your personal desires, as quality is top notch in all of them. Don’t waste further time and get going with purchasing and installing one of those water heaters so that you can enjoy your hot water flow for years to come!

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