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Traditional water heaters are big, bulky appliances that take up a lot of space. They can be expensive to maintain and service. That’s where the best tankless electric water heaters shine. They take up much less space and can save you loads of money.

If you’re reading this article, you’ve most likely decided you’re ready for a change. There are many excellent brands out there, but it’s important that you choose the right one. After you’ve read our reviews, jump down to our buyer’s guide. You’ll find some helpful information to point you in the right direction.

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The Tempra Plus 36 outranked them all. It provides plenty of hot water and a great range of temperatures.

Ecosmart’s ECO 11 was equally impressive. It provides hot water for fewer sources but comes at an affordable price.

Top 10 Best Tankless Electric Water Heater

Let’s take a look at the rest of our entries. Each one provides different amounts of hot water. Find out how many sources you have that need hot water. Then, check each entry to see which one best fits your needs.


1. Stiebel Eltron Tempra Plus 36 Review "Best Overall"

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  • Small
  • Easy installation
  • Durable construction
  • Easy controls
  • Extra parts needed to install
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The Tempra Plus 36 is Stiebel Eltron’s biggest tankless electric water heater. It can provide you with hot water ranging from 86 °F to 140 °F.

You can change your desired temperature any time you wish. You simply use a knob located on the front cover. The heater has a minimum power setting of 27kW on 208 volts. Its maximum setting is 36kW at 240 volts.

If you’re concerned about temperature fluctuations, the Tempra Plus 36 covers this. It has an advanced microprocessor. It constantly monitors temperature levels and maintains your selected setting.

With the unit, Stiebel Eltron gives you a seven-year warranty that covers any leakage. But they didn’t stop there. You also get three years in the event that any parts break or malfunction within the heater.

The water flow is strong and full. When running a shower, the water maintains your selected temperature and stays there throughout. You should be able to get through two or three showers with no drop on temperature.

Another big plus is that you don’t have to worry about your electric bill spiking. Some users have reported lower bills thanks to making the switch.

Features

  • kW – 36kW
  • Voltage – 240 A
  • Max. amperage draw – 150 A
  • Min. required breaker(s) – 3 x 50 A DP
  • Min. required wire size and number of runs – 3 x 6/2 AWG
  • Min. recommended household electric service – 300 A
  • Min. flow to activate unit – 0.77 GPM
  • Water connections – 3/4″ NPT
  • Output water temperature range – 86°F – 140°F
  • 7-year leak warranty
  • 3-year parts warranty

Ease of Use

Not including installation, the Tempra Plus 36 is as easy as it gets to use. There’s a single knob on the front of the unit to control the temperature. That’s it. The range of warm to hot is clear and easy to understand.


2. EcoSmart ECO 11 Review "Most Budget-Friendly"

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  • Affordable
  • Lifetime warranty
  • Easy controls
  • Doesn’t benefit large homes
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EcoSmart tankless electric water heaters are one of the most used brands. They use proprietary self-modulating technology that helps keep energy usage at a minimum. This allows your water to be heated at a rate that keeps your electric bill in check.

The ECO 11 unit is smaller than some of their other models, which makes it a better fit for apartments. It’s designed to heat around two gallons a minute. It’s important to note that your living quarters should be around 67 °F to get the best performance.

On average, the ECO 11 is able to run two sinks and a shower at the same time. The heater will only activate when you need hot water. Otherwise, it sits idle waiting to kick on when you need it. This alone can save you up to 50% of what it would normally cost to heat your water.

The ECO 11 is a very affordable tankless electric water heater. But you’ll need to be mindful of your living space. A large home would not benefit from such a small unit.

Features

  • 57-amp
  • 11kW
  • LCD display
  • Endless hot water
  • Save 50% in water heating costs
  • Compact design
  • Digital temperature control
  • Limited lifetime warranty
  • Replaceable elements
  • Self-modulating

Ease of Use

A single knob on the front of the unit controls your water’s temperature. A large, easy-to-read digital display shows you the temperature.


3. Ecosmart ECO 18 Review "Best Value"

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  • Small design
  • Affordable
  • Self-modulating
  • Warm climate required for best results
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Ecosmart’s ECO 18 gives you the same high level of self-modulating performance as the ECO 11. But this unit is able to heat water in larger residences.

The ECO 18 is highly durable. It is also compact and very lightweight. Adjusting your water’s temperature is simple and straightforward.

A single knob on the front of the unit increases the heat one degree at a time. This allows you to control the temperature within a range of 80 °F to 140 °F.

By using copper and stainless steel components, the life of the water heater is greatly increased. The self-modulating technology used can help you save up to 50% on traditional water-heating costs.

If your needs meet the ECO 18’s requirements, you will never run out of hot water. You should be able to easily run hot water in two sinks and two showers at the same time.

The ECO 18 can save you not just money. It can also save you energy. And since it’s so tiny, you’ll save room, too. It has a wall-mounted design that makes installation a cinch. It’s a fraction of the size of a standard tank water heater.

Features

  • Durable construction
  • 75-amp
  • 18kW
  • LCD display
  • Endless hot water
  • Save 50% in water heating costs
  • Compact design
  • Digital temperature control
  • Limited lifetime warranty
  • Replaceable elements
  • Self-modulating
  • 99.8% energy efficient
  • Easy installation

Ease of Use

After installation, the only thing you’ll need to use on the heater is its temperature control knob. An LCD screen shows you the temperature as you adjust it.


4. Rheem RTEX-18 Review "Easiest Installation"

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  • Wall-mounted
  • Lightweight
  • Easy installation
  • Limited usage
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Rheem’s RTEX-18 is an affordable and easy-to-use tankless electric water heater. They use self-modulating technology to ensure it only kicks on when you need hot water.

It heats your water with two durable copper heating elements. In the event that these need to be serviced or replaced, Rheem has made it so they’re easy to get to.

Installation is simple. It uses 3/4-inch tapered threaded water connections. The unit mounts to your wall, saving you space and making it easy to get to. And at only 8.5 pounds, it’s a breeze to handle.

The unit is silent throughout its use. There’s no clicking relays or other annoying functions. You just set the desired temperature for your water and its elements heat on demand.

You can expect to get temperatures within a range of 80 °F to 140 °F.

Features

  • 8.5 pounds
  • Self-modulating
  • 18kW
  • 240 volts
  • 7-gallon consumption
  • Copper heating elements
  • Threaded for easy replacement
  • 4.4 GPM

Ease of Use

You control your desired water temperature with a single knob on the face of the unit. An LCD screen shows you the temperature at all times. You increase or decrease in single-unit increments.


5. Eemax EEM24027 Review "Best for Colder Climates"

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  • Works in cold climates
  • Lightweight
  • Easy to install
  • Greater water usage
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Many tankless electric water heaters work best in warmer climates. Eemax’s EEM24027 is just the opposite.

You can get endless, instant hot water, regardless of where you live. This unit has advanced self-modulating control, using electricity only when you need hot water.

Its design is compact and wall-mountable. This makes it easy to access and service. Plus, it leaves you with more storage space.

You can expect to run one shower and two sinks in cold climates. Or, you can run up to four showers and sinks at the same time in warm climates.

Eemax gives you five years of protection against leaks and one year for parts.

Features

  • 13.75 pounds
  • 27kW
  • 240 volts
  • Works in cold or warm climates
  • Wall-mounted
  • Uses 5.3 GPM
  • 5-year leak warranty
  • 1-year parts warranty

Ease of Use

Simply adjust a knob to select your preferred water temperature. A built-in LCD shows your current temperature.


6. Camplux TE27 Review "Most Convenient"

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  • Compact
  • Remote control
  • Stylish
  • Lower temperature than other units
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You can provide your residence with endless hot water thanks to the Camplux TE27.

This wall-mounted tankless electric water heater is sleek and stylish. It sports easy-to-use buttons on the face of the unit for total control. Or, you can use the included remote control for hands-free management.

The TE27 is really small, yet it easily gives you enough hot water throughout your home. It can be mounted at any angle, too. This gives you more flexibility as to where you can mount it.

By having an on-demand feature, no electricity is used until you need hot water. This helps to keep your energy bills low and manageable.

The water heats up in only a matter of seconds. This ensures that hot water is available the moment you need it. No waiting for elements or water to heat up.

In the event that your water gets too hot, Camplux has an automatic shut-off safety feature if water reaches 153 °F.

You can set your water between temperatures of 86 °F and 125 °F.

Features

  • 27kW
  • 240 volts
  • 16.15 pounds
  • Overheat shut-off
  • Remote control
  • Instant hot water
  • ETL- and NSF-approved
  • Flexible 360° installation
  • Compact

Ease of Use

Simple buttons on the unit allow you to make your desired adjustments. But for even more flexibility, Camplux gives you a remote control that allows you to change your water’s temperature.


7. Bosch Tronic 3000 Review "Best for RVs"

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  • Small
  • Affordable
  • No controls
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Do you need hot water for your RV? Do you need it now? Let Bosch help you with their Tronic 3000 tankless electric water heater.

This is a small, compact, under-the-sink type of unit. It is designed to heat water in small areas. Since it only activates when you need hot water, you don’t have to worry about spikes in your electric bill.

Being a point-of-use system, it’s a great option for garages, wet bars, basements, RV, and sheds.

The Tronic 3000 measures 6.5 x 12.25 x 3 inches. It takes up very little space and is easy to hide. Yet it is easy to manage.

Features

  • 3.4 – 9.5kW depending on the voltage
  • 120 – 240 volts
  • Minimum breaker amperage – 30
  • Minimum wire size – 10 AWG
  • Weighs only 5 pounds
  • 98% thermal efficiency
  • 5-year limited warranty

Ease of Use

Once the unit is installed, there is nothing more you need to do. There isn’t a thermostat, and it only heats up via water flow. You do need to ensure that you’re running at least 0.75 GPM to get the heater to activate.


8. Ecotouch ECO90B Review "Best for Small Businesses"

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  • Compact
  • Sleek design
  • Easy to use
  • Only adequate for small buildings
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Ecotouch offers the same quality as other models with its ECO90B water heater.

You get the same features as Ecotouch’s other units, with only some slight variations. For instance, your temperature range is now 67 °F to 106 °F. This is quite a bit lower than other models but should provide you with efficient heating in smaller buildings.

The ECO90B has self-modulating technology, so you’ll never use electricity to heat your water until you need it. And it uses a unique heating element that won’t corrode.

Water and electricity lines run separately to avoid and prevent fires or electrical damage. You won’t have to worry about leakage, either.

You should get years of performance out of your ECO90B. It is made with durable and long-lasting components to provide you with hot water for years.

A digital LCD screen shows your water’s temperature at all times. Adjusting it is easy with onboard controls built into the front of the unit.

The ECO90B is small and compact. This lets you mount it almost anywhere for quick and easy access.

Features

  • 9kW
  • 240 volts
  • Overheating protection
  • Dry-heating protection
  • Leakage protection
  • Compact
  • Durable construction
  • LCD screen
  • Digital control

Ease of Use

Three face buttons are all you use to control the ECO90B. Power, temperature up, and temperature down. The unit is lightweight and slim, making installation effortless.


9. Atmor ThermoPro Review "Best for Medium Homes"

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  • Attractive design
  • Long-lasting
  • Lightweight
  • Requires pressure-relief valve
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The Atmor ThermoPro is a neat little unit. It is specially designed to heat incoming water as low as 37 °F. It provides hot water at a rate of 2.45 GPM.

On the front of the heater is an easily accessible digital temperature control. This lets you adjust your water temperature in single increments. An LCD screen displays the temperature at all times.

The interior of the unit uses high-quality stainless steel components. This helps to prevent corrosion and breakdown.

It works best in moderate to warm climates. If you have a small- to medium-sized home, you’ll have no problem getting instant hot water. You can expect to simultaneously heat two showers and two sinks.

The ThermoPro is sleek and compact. This allows you to mount it to any wall you desire. It weighs just 17 pounds, making installation an easy affair.

Atmor gives you a warranty of seven years against leakage. You also get two years of protection against any parts going bad.

Features

  • 100 amps
  • 24kW
  • 240 volts
  • 17 pounds
  • Compact
  • Durable
  • 7-year leak protection
  • 2-year parts protection

Ease of Use

You control your water’s temperature with a single knob on the ThermoPro. A digital display shows you the current temperature.

Upon installation, you will need a pressure-relief valve. This is to prevent the ThermoPro from exceeding its design limitations.


10. Rheem RTEX-24 Review "Most Efficient"

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  • Easy installation
  • Self-modulating
  • Pricey
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Rheem is back with another RTEX model, the RTEX-24. This tankless electric water heater sports many of the same features as the other RTEX models, but heats up more sources.

A single knob on the front of the unit lets you set your desired temperature. You can adjust if from a range between 80 °F and 140 °F.

This unit uses three copper heating elements to heat up your water. They are easy to service if they have to be replaced for any reason.

Electricity is only used when you need hot water. You get it instantly, with no waiting for your water to heat up.

The RTEX-24 is wall-mounted. And since it’s under 18 pounds, installation is effortless.

Features

  • 99.8% energy efficient
  • On-demand hot water
  • Durable copper three heating elements
  • Field serviceable
  • Simple installation
  • Flow rate up to 5.9 GPM

Ease of Use

A single knob adjusts your water’s temperature to your liking. An LCD screen keeps you apprised of the current temperature.


Buyer’s Guide for Tankless Electric Water Heaters

Tankless electric water heaters can make your life easier and save you money at the same time. But there are some important aspects you need to be aware of before you jump right into it. Let’s go over a few of them.

Important Precautions

You’re going to need an experienced electrician to install your new tankless electric water heater. If you don’t know what you’re doing, don’t even begin to attempt it. You can seriously injure yourself, or worse.

When you pick the correct size, your new tankless water heater can provide you and your family with plenty of hot water.

With tankless water heaters, water is heated up in real-time as it passes through the unit. It doesn’t store a large amount of water like a traditional water tank. So you can only get a certain amount of hot water at a time.

This is why it is vital that you select one large enough and powerful enough for your residence. For that, you need to know what to look for. To learn more, let’s move on to the next guide.

How to Choose the Best Tankless Electric Water Heater

First, you have to know how many faucets and sources will be needing hot water throughout your residence and how often.

Read up on each heater to ensure that it can adequately provide hot water for all your sources. If you get one too small, hot water will run out quickly. You’ll have only cold water to work with until your unit can heat back up enough to start supplying hot water again.

Second, add up how much water passes through each source. This is their gallons per minute (GPM). So, if one faucet has 0.50 GPM, and your shower has 2.50 GMP, then you need a heater that can handle at least 3 GPM.

Your climate plays a big role in how well a tankless water heater works. The colder the climate, the less hot water is provided.

What Are the Advantages of Tankless Electric Water Heaters?

Since you’re no longer storing a large amount of water in a tank, your energy bill will be less. Hot water is delivered instantly, instead of taking several minutes to heat up a large tank.

Plus, tankless water heaters tend to last longer than traditional water heaters since there are fewer parts to be serviced over time.

Tankless water heaters take up much less space, too. Most of them mount on a wall and are only a couple of inches deep. If you choose the right size tankless water heater, you can enjoy endless, instant hot water.

Tankless versions usually cost more than traditional water tanks. They can also be mighty expensive to have them installed. But, the money you can save on your electric bill more than makes up for the up-front costs in the long run.