Best Electric Tankless Water Heaters in 2021

Installing the best electric tankless water heater is a great way to provide unlimited hot water for your household at a lower cost. Compared to traditional water heaters, electric models are energy efficient and can drastically lower your electricity bills. Instead of holding water, tankless heating systems heat the water on demand.

You might be wondering what’s wrong with that. Well, having a tank means you need bigger storage space. Also, when that tank leaks, you’re going to have a huge mess to clean up. That is why I much prefer electric tankless water heaters. If you wonder what the best electric tankless water heater for your needs is, you are in the right place.

Finding a water heater that meets all your needs can be overwhelming. Luckily, we have done adequate research to find the best electric tankless water heaters that you can grab. We have also included a buying guide to help you make an informed decision about the electric tankless water heater for you.

Comparison of 10 Best Electric Tankless Water Heaters in 2021

Image	Product Name	Features	Price
	EcoSmart Electric Water Heater	Voltage: 240 V Water temp. range: 37°f – 77°f Flow Rate: 27 – 66 Gpm Warranty: Lifetime warranty	Check Price
	Stiebel Eltron Tempra Plus	Voltage: 240 A Water temp. range: 86°F – 140°F Flow Rate: 0.77 GPM Warranty: 7 yr leakage/3 yr parts	Check Price
	Rheem RTEX-18 Water Heater	Voltage: 240 V Water temp. range: 80°-140°F Flow Rate: Up to 4.4 GPM Warranty: 5 Year	Check Price
	Titan Electric Water Heater	Voltage: 220 volts Flow Rate: 4 GPM Dimensions: 12 x 10 x 5 inches	Check Price
	Marey ECO150 Water Heater	Voltage: 220 v – 240 v Water temp. range: 37°f – 77°f Flow Rate: NA – 3.5 Gpm Warranty: 5 years	Check Price
	Sio Green Electric Water Heater	Voltage: 240 v Water temp. range: 30ºF – 60ºF Flow Rate: 2.5 – 4.0 GPM Warranty: 2-year	Check Price
	Bosch Electric Water Heater	Water temp. range: 45ºF – 75ºF Flow Rate: 2.4 – 3.5 GPM Warranty: 5-year heating module /2-year parts	Check Price
	Atmor Tankless Water Heater	Voltage: 240 V Water temp. range:  90-135°f Flow Rate: 3.7 GPM	Check Price
	Bosch Mini-Tank Water Heater	Voltage: 120 volts Water temp. range: 65-145°F Flow Rate: 6.8 GPH Warranty: 6 year	Check Price
	Rheem RTG-84XLN Water Heater	Voltage: 120 volts Water temp. range: 35-Degree Rise Flow Rate: 8.4 GPM	Check Price

Top 10 Best Electric Tankless Water Heater Reviews in 2021

1. EcoSmart Tankless Water Heater

Next up on our list of top electric tankless water heaters is the EcoSmart ECO 27. Although it is slightly on the expensive side, this device has won the hearts of many because of its impressive features. It is one of the few models that focus on smart technology and eco-friendliness.

Definitely, a large portion of expenses for most homes go-to energy bills. Luckily, the EcoSmart ECO 27 is designed with efficiency in mind. With this product, you can save up to 50% of your water heating costs compared to conventional models.

It features a self-modulating control system that adjusts the water pressure and power usage automatically. This ensures a consistent output and increased energy savings. For smart technology, this electric tankless water heater is equipped with digital control for setting the temperature.

Impressively, this feature allows increment of one-degree temperature. On top of that, this model can heat 3 GPM when the temperature of incoming water is as low as 7 degrees Fahrenheit as well as 6 GPM when the water temperature is high.

Better yet, the EcoSmart ECO 27 is small and compact, enabling you to save a lot of space. Plus, it has a modern and stylish design, and you can fit it anywhere in your home. We are also impressed by the internal components. The components are also very easy to replace.

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2. Stiebel Eltron Tankless Electric Water Heater

Coming from a reputable brand, this stylish heater has a very impressive performance and comes with great features that are likely to meet your on-demand for hot water. To start off is the sophisticated flow control feature that is designed to maintain the hot water temperature steady.

This technology automatically senses the temperature and water flow rate of the incoming water. It then calculates the amount of power needed and adjusts the water flow rate to match its capacity. At peak performance, it can deliver a maximum flow rate of 4.5 GPM which is sufficient for most households.

It may however not be able to meet the hot water demands for larger homes. But for small to medium homes, it is very powerful and can cater to the hot water needs of the whole household. It is also equipped with thermostatic temperature control as well as a digital control display that is easy to read.

Plus, the relatively large knob makes it possible to set your preferred water temperature ranging from 30 C and 60 C (86F and 140F). If you are looking for a unit that could be used in both warm and cold climate areas, the Tempra 29 could be an ideal choice. However, the flow rate of this tankless water heater if the incoming water temperature is low.

3. Rheem RTEX-18 Residential Tankless Water Heater

Rheem is a company that has been around for years and manufactures some of the most premium models, and the Rheem RTEX-18 is no exception. With a water flow rate of up to 4.4 GPM, this unit is deemed the best whole house electric tankless water heater.

Based on the best electric tankless water heater reviews, this unit can provide a consistent flow of hot water in larger homes even when different faucets are used at once. We love the durable and rugged construction that renders this device long-lasting.

On top of it all, it is 99.8% energy efficient so that you don’t have to deal with high energy bills. It is also very easy to use and has temperature controls that allow you to set the temperature to your preference. Plus, it allows for increments of 1 degree Fahrenheit ranging from 80 to 140 degrees Fahrenheit.

Additionally, it has two heating elements that are based on durable copper immersions. We are also impressed by the stylish design that makes it match well with most home decors. On the downside, it is a bit larger than other models on this list, and it may take too much space when placed under a sink.

4. Titan Electric Tankless Water Heater

The Titan N-120 is a reliable and efficient heater that might be a choice for small to medium homes. It has a maximum flow rate of 4 GPM which should be enough to service 2 showerheads. However, it may not be able to meet the hot water demand for very large homes.

One thing that stands out about this water heater is the fact that it can save up to 60% on energy bills when compared to traditional heaters. You can therefore enjoy hot water in your home without having to pay for high utility bills at the end of the month. Another thing that we find impressive is its compact size.

It comes in a small and compact size making it convenient to install even in smaller spaces. We also love that this unit operates well with all kinds of water. For this reason, this unit might be the best tankless water heater electric for those who have wells installed on their property and still want to enjoy the benefits of hot water.

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5. Marey Tankless Water Heater

Are you in the market for an energy-efficient tankless water heater for a 2-bathroom household? Well, we would highly recommend the Marey Eco water heater. This device is one of the ideal energy-saving models in the market that is likely to lower your utility bills.

It has a maximum flow rate of 2.5 GPM. It also features a flow switch activation mechanism that can deliver endless hot water even when the flow rate and pressure are below 5 GPM/5 Psi. Hence, it could be an affordable choice for meeting the hot water demands for your whole family. What got our attention is the smart control technology that renders this device user-friendly.

Because of the smart technology, adjusting the temperature of the heater is very easy. It also helps to facilitate maximum optimization of energy use. Marey ECO150 is equipped with an LED display that facilitates easy control of the temperature and safety features in order to avoid overheating. However, a downside of this unit is that it is prone to leakage from the back.

6. Sio Green SIO18 Infrared Water Heater

Using a water heater with a tank, the biggest headache you will have is the electricity bill. Those monster heaters eat up so much power! However, this Sio Green SIO18 is very efficient in that regard. Your electricity bill will noticeably lower as soon as you replace your old heater with this.

The SIO18 utilizes infrared heating technology and it works in a way that the metal heating elements don’t come into contact with the water. Therefore, even if you live in a hard water area, you wouldn’t have to worry about corrosion, limescale deposit, or calcium buildup.

It’s quite a small machine, with a simple yet innovative design that saves a lot of space. For light use around a small to medium-sized household, this is a great tankless water heater. However, for use in a larger household, you should definitely pick up a bigger, heavy-duty model.

One thing that you should consider before buying this is the installation cost. The warranty on this tankless water heater is only valid if you employ a licensed plumber and electrician for the installation. Altogether, that could become quite expensive.

7. Bosch Thermotechnology Tronic Water Heater

Another electric tankless water heater on our list is the Bosch WH27- a very powerful and compact model. This model is manufactured by Bosch, which is one of the pioneering brands when it comes to home appliances.

What we love about this compact model is the fact it can be installed anywhere. Because of its compact design, it is a great option to use in both residential and commercial spaces. It features a modulating control unit and a built-in electronic flow sensor to ensure steady temperature output.

This device can deliver 3.3 GPM with a temperature rise of 55 degrees. This is a decent performance for the best electric tankless water heater, and it is able to deliver constant hot water. However, it can only cater to one major appliance at a go.

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8. Atmor Electric Tankless Water Heater

If you are looking for an inexpensive way to heat water in your home, the Atmor AT- D18TP-AZ could be your best option. If you are looking for a model that cuts down your high energy bills, you may want to consider the Atmor AT-D18TP-AZ. This residential water heater is designed to cut energy bills by up to 50%.

This technology only turns the water heater ON when you turn ON the water faucet. With its easy-to-use digital panel, you can adjust the temperature to your preference. It is also equipped with an advanced self-modulating system for controlling the water flow rate. The self-modulating system is also handy for regulating the amount of energy needed to heat the water.

This also helps to lower the energy bill and save you money. With a water flow rate of 3.7 GPM, this water heater is suitable for small homes and warmer climates. We are amazed by the fact that it can run up to 3 applications at a go. So, you can run the shower, kitchen sink, and bathroom all at once with inlet temperatures of 73 degrees Fahrenheit.

9. Bosch Tronic Mini-Tank Water Heater

The Bosch Tronic 3000 is an easy-to-maintain electric water heater that features a 7-gallon capacity mini tank. Although it is not tankless, this model could be a great option for those looking for water heaters for their mobile homes and outdoor kitchen. It can be considered the best electric tankless water heater for an RV.

It’s the best in this category because it is extremely portable and comes with a single power cord plug that can fit in any standard wall outlet. You simply need to plug it in and connect the cold water line, and hot water will start flowing in no time thanks to the fast recovery rate.

The tank features a glass lining which ensures adequate insulation and 94% thermal efficiency.  The temperature ranges from 65 to 145 degrees Fahrenheit and you can easily adjust it using the dial. It is also equipped with a pressure and temperature relief valve for safety purposes.

Additionally, this product is very flexible since it can be mounted vertically or horizontally on the wall. If you like, you can as well place it on the shelf or floor. Better yet, we appreciate the easy installation which removes the need to hire professional help.

10. Rheem Tankless Natural Gas Water Heater

Are you lacking space inside your home and still want to install a water heater? Worry no more! Rheem RTG-84XLN could be what you need. This tankless water heater is designed for outdoor installation, and it offers a continuous supply of hot water for your entire household.

One feature that stands out about this electric water heater is its lightweight and compact design. It features a space-saving design, and you may install it even in areas with limited space. This heating element is also energy efficient; hence, it can meet your hot water needs at lower electrical bills.

In addition, it can deliver 8.4 gallons of water per minute at a temperature rise of 35 degrees F and 6.6 gallons per minute at 45 degrees F rise. If you hate the hassles of installing a water heater, you will appreciate that this model is very easy to install as compared to other indoor models. Also included is a UMC-117 remote control as well as a temperature control unit.

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How to Choose the Right Tankless Water Heater

There are a plethora of features that you need to consider when shopping for the best electric tankless hot water heater. They include:

1. Flow Rate Needs

One of the vital features when buying any tankless water heater is the flow rate. Different faucets and appliances differ when it comes to their water requirements. For example, the hot water demand for a washing machine may be higher than that of a bathroom sink.

You, therefore, need to understand the water flow rate for various systems in your home, so you can find a unit that meets their demand. Also, take note that units with high flow rates use more energy and can slightly be expensive.

2. Size

To know the right size for your tankless electric water heater, you should keep in mind the daily consumption of your home and the flow rate needed. Additionally, determine how much space is available and measure the space where you intend to install the device.

3. Incoming Water Temperature

Importantly, know the temperature of the incoming water, so you can be in a better position to analyze the temperature rise. When you know this, it will be easy to choose the best electric tankless water heater that will deliver the required flow rate.

Generally, most electric tankless water heaters offer a high performance when they are not required to produce a temperature rise of more than 30 F. Tankless hot water heaters may need to work harder in colder climates as compared to warmer climates. You should therefore analyze the climate condition of your area in order to find the right unit for your needs.

4. Energy Efficiency

While electric tankless water heaters are energy-efficient, you should know that some are more efficient than others. For this reason, you should do your research and choose models that have a strong efficiency rating.

5. Brand

Before making your decision, it is paramount to research various manufacturers and determine who makes the best electric tankless water heater. When you purchase products from reputable brands, you can be assured of quality and a reliable warranty.

Some Benefits of Installing Electric Tankless Water Heater

If you are wondering what benefits can be accrued from installing tankless water heaters, be sure to read on:

Lower Energy Bills

This is probably one of the main benefits of tankless water heaters. With an electric tankless water heater, you will lower your utility bills and save some money. According to Energy.gov, on-demand electric water heaters are likely to be more efficient than conventional water heaters.

Consistent Hot Water Flow

Unlike the conventional models, electric models heat cold water on demand, so it never runs out.

Cheaper to Install

Electric models are affordable to install compared to gas tankless hot water heaters.

Space-Saving

Since they are tankless, most of these models are compact and take up less space.

Durable

Electric tankless water heaters last up to 10 years longer than the traditional models.

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Frequently Asked Questions (FAQs)

Q: Why Is an Electric Tankless Water Heater Right for Your Home?

A: First, it is easier to install the best electric tankless water heaters than other models, and they do not emit greenhouse gases. Also, electric tankless water heaters help save energy bills, and they provide you with hot water every time you need it.

Q: How Does the Electric Tankless Water Heater Hear Water Immediately?

A: When the faucet is opened, the water flow triggers the heater on. Hence, if you use electricity or gas, the electrical elements are triggered, which in turn rapidly heats the water as it moves through the unit. When you are done taking the water, you shut it off, and the elements shut down automatically. During this phase, the energy used is only for the hot water produced.

Q: What Is the Difference Between the Electric Tankless Water Heater and a Storage-Tank Water Heater?

A: An electric tankless water heater does not store hot water. However, you only heat the water when you want to use it. On the other hand, a storage-tank water heater is used to keep water hot all through the day. Hence, you will always have hot water within your reach anytime you need it.

Conclusion

Most households are shifting from using traditional heaters to electric tankless water heaters to meet their hot water demands. Because these water heaters systems are very easy to install and reduce energy costs by up to 15%. When choosing the best electric tankless water heater for your household, it is vital to consider factors such as flow rate, size, and incoming water temperature. Also, invest in a system that meets your home’s exact heating needs.