9 Best Electric Tankless Water Heaters of 2022

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best electric tankless water heater

An electric tankless water heater is energy-efficient, which means it will lower your electricity bills, offer you tons of hot water, and may even improve the resale value of your home. An on-demand or tankless water heater ensures you have plenty of hot water in an efficient manner compared to a tank-style water heater. Rather than holding hot water in a tank, the water is heated as it is needed.

Finding the right tankless water heater to meet your needs and fall under your budget is difficult. Getting one you can easily install is another concern to think about. There are tons of options on the market and deciding which is the best can be confusing. That’s exactly why we have put together a list of the nine best water heaters.

In addition to explaining what makes these nine tankless heaters the top choices, we’ll also share information about the important features to look for when choosing a water heater. We’ll explain everything from size to flow rate and ease of installation so you are ready to get your water heater installed and operating as quickly as possible after it gets to your door.

The Best Electric Tankless Water Heater

EcoSmart ECO 11 Electric Tankless Water Heater3.8 x 8 x 11.5 Inches6.5 PoundsCHECK PRICE ON AMAZON
Rheem RTEX-18 Residential Tankless Water Heater4 x 15 x 19 Inches8.5 PoundsCHECK PRICE ON AMAZON
Stiebel Eltron 224199 Tempra 24 Plus Whole House Tankless Electric Water Heater21.7 x 20.1 x 9.6 Inches16.1 PoundsCHECK PRICE ON AMAZON
Bosch Electric Mini-Tank Water Heater Tronic 3000T13.75 x 13.75 x 10.75 Inches15.5 PoundsCHECK PRICE ON AMAZON
Titan N-120 Tankless Water Heater13.8 x 9.8 x 4.8 Inches7.95 PoundsCHECK PRICE ON AMAZON
Ecotouch Electric Tankless Water Heater11 x 7.5 x 2.35 Inches6.9 PoundsCHECK PRICE ON AMAZON
Marey ECO110 Self-Modulated Small Tankless Water Heater3.1 x 7.5 x 10.8 Inches7.5 PoundsCHECK PRICE ON AMAZON
Rheem Heating Chamber RTEX-13 Residential Tankless Water Heater4 x 9 x 13 Inches4 PoundsCHECK PRICE ON AMAZON
Rinnai V Series HE Tankless Hot Water Heater13.9 x 8.8 x 23.6 Inches49.4 PoundsCHECK PRICE ON AMAZON

EcoSmart ECO 11 Electric Tankless Water Heater

The ECO 11 from EcoSmart is designed for use in a small or medium-sized home in a location with a moderate temperature. Those in large homes or areas with a cold climate may find it isn’t the best choice. This heater can deliver water of up to 105 degrees Fahrenheit nearly instantly. It has a digital temperature control that you control so the water is at the temperature you prefer every time it is used. If works best where the incoming water is at least 67 degrees.

This is an energy-efficient unit that claims to offer savings of up to 60% on energy bills. It works efficiently without standby time and turns on only when needed. Another perk of this unit is that it’s easy to install and use. You need a 60 amp power supply and #6 copper gauge wire to handle the installation. It sets the temperature automatically to begin with so you can get started right away.

With this unit, you get a lifetime warranty as long as it is used in a residential setting and was installed by a licensed professional. The warranty covers the element, heat exchanger, and electronics.


● The tankless water heater comes with a lifetime warranty for peace of mind
● Offers an outstanding 99.9% energy efficiency to be eco-friendly
● Provides savings of up to 60% on your water heating costs compared to a traditional heater


● The unit requires temperature regulation through flow rate

Rheem RTEX-18 Residential Tankless Water Heater

The RTEX-18 by Rheem is a fantastic point-of-use tankless water heater. It offers continuous hot water for several applications going on at the same time. This is a heater made for a small or medium-sized home without excessive water demands. It provides instant water for sink, showers, appliances, and more. It has a price tag that is fairly similar to other units with the same features.

One of the biggest advantages of this water heater is that it can be installed easily. Even a do-it-yourselfer can handle the job without a lot of trouble. It also happens to be a compact water heater so it will fit into spaces that many other tankless water heaters would not. It has a stylish look that will make any space look even better.

This unit has digital temperature controls so you can choose the right temperature in one-degree increments from 80 to 140 degrees. It is also 99.8% efficient to help keep your electric bill reasonable. The unit can handle up to 4.4 GPM of water, which is enough for dishwashing and a couple of hot showers.


● Features simple installation with a ¾ inch NPT water connection
● Offers an excellent flow rate of up to 4.4 GPM along with durable heating elements
● Comes with an LED display and external digital thermostatic control


● The mounting and wiring diagram for installation can be hard to read

Stiebel Eltron 224199 Tempra 24 Plus Whole House Tankless Electric Water Heater

The Tempra 24 Plus is offered by Stiebel Eltron and offers German engineering and technology for the tankless water heater. This heater is designed to replace a conventional water heater without causing any major disruption to the amount of hot water a household can access. This is a popular choice for larger families with two or three bathrooms that use a large amount of water. It is also one of the more affordable options for larger groups.

This tankless water heater can produce up to 2.7 gallons of water every minute, but it also adjusts automatically based on the demand of the household. It can handle input water temperature as low as 42 degrees and can accommodate using a sink as well as a hot shower at the same time. If the input water is higher, it can heat up to 5 GPM for a sink and two showers.

You can expect to use up to 20% less energy with this water heater when compared to a traditional model. It is also 99% efficient so you conserve energy. This is also a small heater at about 22 x 20 x 10 inches in size so you can place it wherever you like. It is small and compact, as well as silent while in use.


● Offers savings of up to 20% on the hot water portion of your electricity bill
● Has a sleek design that fits in anywhere and has no need for venting
● Includes Advanced Flow Control for a constant temperature


● May be difficult to find replacement parts when needed in a hurry

Bosch Electric Mini-Tank Water Heater Tronic 3000T

This small water heater is not entirely tankless, but it has a much smaller tank that a traditional water heater. It has a seven-gallon tank that can offer instant hot water to a sink or appliance right when it is needed. The size of this water heater is so compact and small that it can easily be used for an outdoor kitchen, RV, or a boat. It also happens to be one of the least expensive models on the list so you can easily switch out your heater and save money on energy next month.

The size of this water heater has a lot to do with the popularity it sees. It offers instant hot water in a small package of only 17.5 x 14.5 x 17.5 inches. It has a design that makes it blend into any environment, so it doesn’t have to be relegated to living under the sink. It can be wall-mounted vertically or horizontally depending on preference.

This tank features a glass lining which creates excellent insulation and 94% thermal efficiency. It also has an easy to use dial that controls the temperature of the water that is available. A pressure relief valve also makes this a safe option.


● Features a thermal efficiency of 98% and 2.4-gallon point of use mini-tank
● Several mounting options so you can choose the one that works best for you
● Has a fast recovery wait to prevent waits getting hot water at the sink or shower


● Some individuals have experienced malfunctioning components while using

Titan N-120 Tankless Water Heater

The Titan N-120 electric tankless water heater is perfect for those with a medium or low capacity need who want a compact heater option. This water heater is only 7 x 10 x 2.75 inches, so it takes up next to no space and weighs in at under eight pounds. Unlike many other water heaters, it has the inlet and output valves on the side rather than the bottom. It also has an analog temperature controller, but it does not offer a number display.

The unit can be easily mounted anywhere but requires a breaker of 60 amps since it draws 54 amps. It can consume as much power at 11.8kW at 240 volts, but it also has self-modulating technology. That means the water heater is only going to use that much power when it has a need to do so. Most of the time it will use a much smaller amount.

This heater from Titan has a one-year warranty for electric components, while water components are under warranty for 10 years. It works well for many people but may not be the best choice if you are located somewhere that is colder than average.


● Offers a compact water heater without restricting GPM of hot water
● Sampling system offers a constant output temperature by adjusting the flow rate
● Inexpensive and easier to use than many tankless water heaters on the market


● Includes a high water temperature inlet requirement so not useful in cold climates

Ecotouch Electric Tankless Water Heater

Those who want nearly instantaneous hot water on demand will find the Ecotouch Electric Tankless Water Heater handles whatever you throw at it. It has a heating element at 5.5kH so you can get hot water in less than five seconds, which makes it a great choice for quick hot sink water when you don’t have time to stand around.

This heater helps avoid standby, unlike traditional bulky storage water heaters. This allows you to minimize energy waste and can even offer up to 65% energy savings, so you pay less on your bills every month. The device also offers cleaner water since it isn’t held in a tank which can create rust and bacterial growth. The electricity line and water line are separated to prevent calcium deposits.

As far as safety goes, this tankless water heater was several components. It has leakage protection, as well as dry heating protection and over-temperature protection. It has a compact design and can be used under or above the sink in whatever position you prefer. It comes with everything you need, including a power cord, ½ inch NPT pipe fitting, and easy installation brackets.


● Offers a 5.5kW heating system for consistent and instant hot water at 116 degrees
● Features smart self-adjustment based on temperature settings and flow rate
● Comes with a digital touch and display control panel to easily set temperatures


● Requires a special NPT fitting that may be difficult for some to find

Marey ECO110 Self-Modulated Small Tankless Water Heater

The Marey ECO110 is an eco-friendly tankless water heater that is ideal for use at two different spaces in the southern areas of the United States where incoming water is at or above a temperature of 70 degrees. In regions that are a bit colder, you can expect to enjoy a 1.3 GPM for hot water flow. This is a German-designed product which has a heating chamber and water chamber that are both constructed of stainless steel.

This compact water heater has smart technology included for easy adjustment and simple management. It has an LCD panel where you can program in the exact temperature that you want the water to be, so you reduce the amount of electricity being used. This tankless heater offers hot water on demand which is activated by water pressure as soon as you turn on a faucet or appliance using water.

This is a water heater that has the potential to use 60% less energy than a traditional tank water heater, so it can offer savings on your bills. This means the heater is going to be more friendly to the environment and cost-effective at the same time.


● Features smart technology with easy management and adjustments on an LCD panel
● German designed product made with stainless steel water and heating chambers
● Maintains 98% efficiency through its entire lifetime


● Some individuals didn’t receive instructions with the water heater

Rheem Heating Chamber RTEX-13 Residential Tankless Water Heater

Another great option from Rheem is the RTEX-13, which is the newest version of the RTE 13, which was known as one of the best tankless water heaters on the market. This heater is holding up well as the successor with many happy users around the world. It has a small size that is great for a home or a smaller apartment with less space to deal with.

This is a unit that is 99.8% energy efficient while also offering endless hot water as needed for a single appliance or multiple uses at one time. It has an external thermostat and an LED display so you can easily see the temperature. You can also adjust it from between 80 and 140 degrees depending on your preferences and needs.

The maximum water rate is four gallons per minute and that is plenty of offer hot water for a kitchen sink and a shower at the same time. It used a 60 amp breaker and uses 240 volts and 54 amps to operate.


● Threaded for easy replacement and designed to be simple to install
● Offers 99.8% energy efficiency to be cost-efficient and friendly to the environment
● Comes with an external adjustable digital thermostatic control with an LED display


● Some have experienced issues before the one-year mark with this heater

Rinnai V Series HE Tankless Hot Water Heater

The final tankless water heater we want to showcase is the Rinnai V Series HE. It offers a combination of comfort, value, and efficiency ins a small package. This is a natural gas tankless water heater that is reliable in indoor locations. It also comes with a great warranty that can compete with any other heaters you run across on the market.

This device has an Energy Star Qualified Energy Factor of 0.82 for natural gas and propane in a mobile home. It also offers a leak detection system for safety to prevent property damage if something goes wrong. Enhanced scale detection is another safety feature to prevent damage to the unit while temperature lock prevents the temperature from being changed without you knowing it happens.

One of the best features of this heater is that it comes with a mobile app. It can be used to put the system into vacation mode when you aren’t using it. It also lets you set up timers and schedules so you always have the water temperature you prefer.


● Offers nearly endless hot water to an entire home at once
● Features a 120-month heat exchanged warranty, 12-month warranty on labor, and a 60-month warranty on parts
● Comes with a mobile app to schedule and add times throughout the day


● Some people have experienced malfunctioning units being shipped

Selecting the Perfect Tankless Electric Water Heater

The reality is that searching for a tankless water heater can take a bit of time since so many of them exist on the market. That’s why we wanted to offer a bit of insight into what to look for when choosing a water heater. This will assist you in deciding which model is right for your specific needs, so you are happy with your purchase.

Incoming Water Temperature

The best tankless water heater systems are going to prevent the temperature from rising above 30 degrees Fahrenheit. Even if you choose one of the most powerful units on the market, keeping a temperature of over 50 degrees is difficult when keeping up a great flow rate.

Those who live in Canada or the northern United States may want a heater with a tank or a gas unit that can handle higher temperatures. Those who are residing in the southern part of the U.S.A. or who are using the heater in spring and summer will find a tankless is the perfect option.

Need for a Certain Flow Rate

Different faucets and appliances in your home are going to require different amounts of water. As an example, a single bathroom sink is going to use much less hot water than a dishwasher or a washing machine would. Systems are rated according to flow rates and knowing what that means is important to choose the right water heater. The more water flow you need, the more expensive a unit is going to be. Higher flow rate systems also tend to use more energy.

Type of Demand


Bathroom Sink

0.5 GPM

Kitchen Sink

0.5 GPM

Laundry Sink

1.0 GPM


1.0 GPM

Low-Flow Shower

1.5 GPM

Washing Machine

1.5 GPM

Standard Shower

2.5 GPM

Water Heater Sizing

tankless electric water heaters for home

Water heaters come in a huge variety of sizes, so you want to consider whether you want a small water heater or a large electric tankless water heater. Part of this is preference while part of it relates to the space you have available. You want to take measurements of the area where the unit will be installed before you go through with a purchase. If you are using a tight space, you may need to choose a smaller unit.

You also should consider the capacity of the heater when making a purchase decision. If you need a high-capacity model, that’s something to be aware of as soon as possible.

Brand Offering the Tankless Water Heater

While the brand on the tankless water heater isn’t the most important thing to consider, it is another factor to take into consideration. If you choose a model from a well-known brand, you can often find out important information about the typical warranties and quality of the brand.

However, even lesser-known brands may offer excellent heaters, so don’t discount them. Just make sure to do some research to ensure you get a water heater that meets all your needs.

Materials Used in Tankless Heater Construction

Most of the tankless water heaters you find in the market are made of metals that allow lime to build up, which also means you need annual maintenance to keep them in good shape. The recommendation is to have the system cleaned of lime and maintained at least once every year. This is done through removing and flushing out any mineral deposits that have built up over time.

The good news is that there are new technologies available, like infrared, that experience less lime build-up for less maintenance. However, there are often more expensive and have a lower flow rate. If you have very hard water, an infrared unit may be the best choice as it requires less maintenance and is less likely to break down.


At this point, you have all the information you need to choose the ideal electric tankless water heater. The heaters listed above may offer you a choice that works well for your home. If that isn’t the case, you can use the information we provided to research and choose the heater that does meet your needs. So, get out there and find the right unit for your home!

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