Electric tankless water heaters are the future of household water heating systems. They are easier to install than their gas counterparts and come cheaper on the long run, especially with electricity prices being far more stable and consistent than gas prices. In short, electric water heaters use electricity to heat up the incoming water flow. Basically, the water flows through the preheated water heater and it gets warmer as it goes through it, leading to hot water on demand anywhere in your household. Tankless electric water heaters are much smaller than the tank heaters, and even than the tankless gas heaters.

They are also safer, with a longer lifespan and require less maintenance. Sure they cost a bit more at first, but their value distributed throughout the years of usage will be much less than a regular heater. Usually a family of three can easily use only one electric heater without having to sacrifice water time, although a bigger family will probably have to install more than 1 small electric heaters, or just one but bigger.

So if you’ve already made up your mind you will probably be lost in the vast ocean of water heaters by now. It is important to choose the perfect water heater for you and we know that, so we’ve handpicked five of the best electric tankless water heaters for you. The final choice, though, still lies onto you, so buckle up, as we are about to go through the choices for your new water heater!


Eco Smart is a pioneer in electric water heaters. They implement the newest technologies in the world such as self-modulating technologies which allow your water heater to regulate exactly how much energy is needed to heat the amount of hot water you require. These tankless water heaters can amount to saving you up to 50 percent on your water heating costs on the long run. Their models are also compact and wall-mounted leaving you with much space in your closet. Also, as of right now, they are the only company that provides you a lifelong warranty on their products.

The Eco 27 bares the name of being one of the largest electric tankless water heaters available on today’s market. It is ideal for cold places, where water temperatures can get really low. In such cases it can easily heat up water for 2 simultaneously running showers without you even running out of hot water. In warmer regions it can handle high-demand households where it can handle heating up the staggering 6 gallons (or 23 litres) per minute, allow you to use showers, sinks and even a dishwasher at the same time. It has a digital control which allows you to regulate the temperature in increments of 1 degree. The Eco 27 will never fail you and will provide running hot water on demand, without taking too much space in your home, so basically all you need is an empty wall and a few hours of installation time.

The Specs:

  • KW: 27

    KW: 27

  • Voltage: 240

  • Dimensions: 17"H x 17"W x 3.75"D

  • Weight: 13.75 lbs. Or 6.2 Kilograms

  • 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.


  • Saves you up to 50% of energy costs

  • Most advanced self-modulating technology

  • Pleasant to the eye stylish design

  • Grants you control over the hot water in 1 degree increments

  • Stainless steel and copper components meaning durability, efficiency and easy replacement

  • Compact in size

  • Heats 3GPM in colder climates

  • Easy installation

All these features make the Eco 27 undisputedly one of the best electric tankless water heaters in the world right now. We will also list some of its most important advantages over the rest of the industry.


  • Easy to clean and maintain. All you need to clean this heater is a phillips screwdriver and a little spare time. Once you install it, you will get your lifetime warranty and all you will have to do is easily maintain it from time to time.

  • Safety. The internal jumpers limit the water heating temperatures to 105 degrees Fahrenheit (or 40 Celcius) so this will mean it will never over-heat unless programmed to do so. That makes it safer for environments involving elderly people or kids.

  • Unprecedented Power. The sheer heating capabilities of this heater are unmatched and can heat up as much as 3 gallons per minute in some of the coldest habitable places on this planet.

stiebel eltron tempra 24

Eco’s best rival is the Stiebel Eltron Tempra 24 electric tankless water heater. It is perhaps as technologically advanced as the Eco Smart competitor. Stiebel have redesigned their electric water heaters from the inside out, creating the perfect machine for your household. It features a simple single flow sensor design, with a hinged cover meaning you can easily access and maintain it any time you like. It further cements the German quality on today’s market. With this heater you will save up to 20-30% kWH compared to your old tank heater, due to its energy efficiency. It features a simple command board at front which lets you easily adjust the hot water flow any time you like. As any other of high-end electric heaters, the Tempra Plus will save you space and will lead you towards a life with zero to no worries about hot water in your home.


  • 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


  • AFC (Advanced Flow Control) which will automatically adjust the flow of the water

  • Unlimited Supply of Hot Water

  • Sleek Design Saves Space

  • Adjustable Temperature Control

  • Three Year Warranty

  • Seismic Proof Construction

  • Digital Display

  • Thermostatically controlled

  • Proven Reliability

  • Saves you up to 30% of the hot water portion of your electricity bill

The Stiebel Eltron Tempra Plus won’t cost you any more than a conventional tank water heater and installation is also often cheaper. It also packs a far longer service life than a normal tank water heater, saving you money by reducing how often replacement takes place and is necessary.

Usually you’d place your large, bulky hot water tank in your basement and utility room. That will lead to often waiting for the hot water to pour in. This electric heater’s design allows you to install it much closer to your hot water taps, making the wait for hot water almost non-existent.

Stiebel’s Tempra has one of the most advanced flow sensors, which feed their readings into the main unit’s proprietary microprocessor control. This heater will constantly monitor the incoming water temperatures and the outgoing ones as well, providing you with just what you demand of it. It engages all of its heating elements in cycles to get to the desired water temperature as efficiently and quickly as possible. This heater also lacks any mechanical switches, resulting in a complete silence during operational times.

Stiebel have been developing tankless electric water heaters and technologies for that for almost 90 years now. They are the true pioneers in this industry and their traditions of excellence mean that you can rely on the performance and reliability of their products for years to come. If you are looking for one of the best electric tankless water heaters, you are looking at the right product.

rheem rte 13

Rheem is a popular brand among electric water heaters. One unit from this brand has gained a lot of attention in recent times and it is the Rheem RTE 13. It is an electric tankless water heater, which is very compact in design and is suitable for homes, apartments, offices,condos, labs and even boats. Basically anywhere you need hot water- this heater is ideal for it all. It will provide energy efficient hot water on demand whenever you turn your faucets on. With its modulating technology it ensures you only use the energy you need to power as many taps you turn on at a time. There is a temperature adjustment dial on the front of the heater which allows you to easily set the water temperature. It also comes with an LED status light indicators that will show you whether it's on a standby or active mode.


  • 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


  • Temperature control unit. You can easily customize the temperature on your own with this easy-to-regulate temperature control board at the front of the heater.

  • Modulating Power. This technology ensures the unit works only when you need hot water, and it heats the water more efficiently that non-modulated electric water heaters. That way you save on your energy bill.

  • Doesn’t require ventilation. Basically you can install this anywhere you would like, even in small, tight spaces, as it does not require any ventilation whatsoever.

The Rheem RTE 13 is truly an amazing workforce for you to have. It has a lot of advantages, and we won’t do it justice unless we mention them.


  • Space Saver. With its unique compact design the Rheem RTE 13 can be installed practically anywhere, as long as you got running water installation there. It will save you space and along with its quietness you will pretty much forget that it's even there.

  • Easy to Install. You won’t need to hire a specialist to install this for you, as long as you got a handy man in the household.

  • Energy Efficiency. With no standby energy loss, it conserves you precious energy and heats up your water only when needed.

  • Ease of Usage. With its control board upfront you won’t need to open it to regulate the temperature of the unit. Just select the desired temperature based on your location, and the Rheem RTE 13 will follow your command, simple as that.

Bottom line the Rheem RTE 13 has earned its name on the market with its compact design, packing all the features of a larger unit. It will provide you with the much needed hot water while saving you money in the same time. It is one of the best tankless water heaters you can buy today. So, if you are looking for a no fuss electric tankless water heater, you can settle down as you’ve found the perfect match for you. Not only is it not expensive and easy to use, but it is also a fantastic heater when it comes to energy savings and living a greener life.

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!