Electric Tankless Water Heater (9 “On-Demand” Choices) Reviews in 2022

Being a homeowner comes with a lot of responsibilities, one being having to choose the right appliances for your home that will bring the most amount of comfort, at little cost. An appliance to consider is an electric tankless water heater. In fact, there are a lot of benefits to choosing one over a traditional water heater.

Usually, those advantages end up being extra savings in your wallet. Here, we have compiled our electric tankless water heater reviews below to help you make the best choice for your home.

Choosing the Perfect Unit

If you are looking for the best electric tankless water heater for cold climates, determine your needs in terms of:

  • Total flow rates of your home as calculated depending on the number of devices you need.
  • The desired temperature rise you want to achieve via the units.
  • Electric tankless water heater reviews describe the units’ volts, amperage, size & weight, installation requirements, the technology used, and other specifications.

Value of Electric Tankless Water Heaters

The big question is whether or not electric tankless water heaters are worth the buy. Here are some of the most noteworthy benefits:

  • They use less power than conventional water heaters.
  • They take up less space than traditional units.
  • Installation is much easier when compared to traditional water heaters.
  • The upfront costs are much lower than with traditional water heaters.

Comparisons Listed

Before we begin, here’s a quick look at our top 3 choices:

Table could not be displayed.

Electric Tankless Water Heaters – We Reviewed

But if you are looking for in-depth product reviews to help you make the best choice, we have compiled our list of 9 of the best on the market:

9. Dltsli Electric Tankless 

tankless water heater options
Dimensions: 13.6″ x 5.3″ x 5.1″
Weight: 5.51 lbs
Voltage: 240V
Amps: 25 A
Avg. Flow Rate: 1.2 GPM
electric tankless water heater

The Dltsli is one of the best electric water heaters for RV units. It is due to the ability and flexibility to adjust between three different power levels: 3.5 kW, 4.5 kW, and 5.5 kW.

Each level can be further refined with ten sub-levels so you can easily find a level that won’t drain your RV battery.

Very compact and can fit anywhere
Variable power levels
Great budget option
It has a meager flow rate
The self-modulating feature isn’t as dependable as you can find in other brands

Besides being a power saver, it’s also very lightweight and compact. Those are two terms that generally describe everything on an RV. In fact, it’s the most compact tankless water heater on the list.

To top it off, a showerhead comes along with the product in the same package. It is not an accessory you’ll find very often in a water heater bundle, but you will appreciate it nonetheless since the total price is quite compelling.

8. EcoTouch Tankless Electric Heater

EcoTouch tankless water heater buying guide
Dimensions: 11″H x 7.5″W x 2.35″D
Weight: 5.07 lbs
Voltage: 220V
Amps: 24 A
Avg. Flow Rate: 1.5 GPM
Best electric tankless water heater

The EcoTouch is the best electric tankless water heater for those who are worried about power consumption. It only uses 5.5kW for heating and 23A of electrical power. Although it only uses a small amount of energy, it still functions well.

It’s a great POU (point of use) system for low-volume areas. Its applications include small offices, RV bathrooms, convenience store sinks, and more.

Extremely energy efficient
Small and compact
Made from light, cheap parts despite the nice design
It doesn’t heat water as hot as other brands do

Another great feature is that the EcoTouch is compact and can fit in small, discreet areas. Since it has a remote control, it’s accessible from almost anywhere in your house. It’s a convenient water heater designed with the consumer in mind. An excellent choice overall.

7. Marey ECO150 With Smart Technology

smart tankless water heater guide
Dimensions: 8.7″ x 14.2″ x 3.5″
Weight: 10.1 lbs
Voltage: 220V
Amps: 60.8 A
Avg. Flow Rate: 3.5 GPM
on-demand water heater

The Marey ECO 150 is a great compact unit that you can use as a POU device. It’s a digital, self-modulating unit that allows you to adjust the temperature using the LCD display and touch buttons easily.

The piece has attractive color-coded inlet and outlet hookups, so it’s effortless to hook up. It’s an excellent unit for people who may not be skilled at installing things.

Color-coded inlet and outlet hookups
It has a beautiful, simplistic look
Self-modulating technology
It uses many amps for a POU unit
A little heavy

Low cost and easy to install, this electric tankless water heater feature a 5-years warranty. Carrying the ETL seal of approval, it is an efficient hot water solution eliminating the standby energy consumption of conventional tank units.

6. Eemax EEM24018

electric yankless water heater
Dimensions: 17 x 14 x 3.75
Weight: 11.65 lbs
Voltage: 240V
Amps: 75 A
Avg. Flow Rate: 7 GPM
tankless water heater setup

The Eemax is a great budget option that can serve as a central unit. It has an average flow rate of up to 7 GPM, which is a good amount for any household. It’s also a self-modulating unit that can reach up to 140°F, so you’ll be sure to get hot water. Eemax employs unique direct-heating technology to heat water efficiently and fast. It also has an exciting design.

The blue on white color makes it stand out in an elegant, decorative way. It also has a handy digital LCD screen and easy touch buttons to set your perfect temperature.

Copper heating element
High flow rate
Fast heating
It doesn’t work as well when it’s cold outside
It’s a pretty big unit

This unit provides a continuous supply of hot water and only heats the water you need when you need it. It features a 5-years warranty. Its resistant and stylish design with digital temperature control in increments of 1°F ranging from 80°F to 140°F makes this one of the best electric tankless water heaters for larger homes.

5. EcoSmart ECO 11 Electric Tankless

EcoSmart tankless water heater buying guide
Dimensions: 11.5″H x 8″W x 3.75″D
Weight: 6.65 lbs
Voltage: 220V
Amps: 54 A
Avg. Flow Rate: 2.6 GPM
how to choose a tankless water heater

This EcoSmart ECO 11 tankless water heater is a high-quality, compact system that is great for small homes and small budgets. While it probably isn’t great to serve as a central unit, it would be perfect as a POU unit for your shower or kitchen sink.

The ECO 11 is a self-modulating unit so you can set the ideal temperature of your water. It has an excellent, high-contrast digital display and a simple dial that allows you to set the temperature. It’s easy to use, modern, and affordable.

Self-modulating technology
Lifetime warranty
Great for RVs
Low flow rate
It is only suitable for one fixture at the time

This tankless water heater may be the best electric water heater for RV we have on this list. This unit is 99.8 percent energy-efficient, with a Uniform Energy Factor of 0.98. You can use it for multiple or single applications depending on your climate. It can heat up to 2 gallons per minute and is optimal for the weather of 67° F and above.

Overall, this is a great choice for RV owners and frequent travelers looking for hot water on the go.

4. iHeat Tankless

tankless water heater benefits
Dimensions: 7.2″ x 11″ x 3.5″
Weight: 8 lbs
Voltage: 240V
Amps: 59 A
Avg. Flow Rate: 2.6 GPM
durable tankless water heater

The iHeat is a heavy-duty system made from stainless steel. It’s the best for rough environments, and its building/structure will last.

The stainless-steel case protects the precious internal elements from damage, making the unit last longer.

Self-modulating technology
Stainless steel casing
1 to 5 years warranty
Low flow rate
It doesn’t work well when it’s cold outside

While the quality of the water heater is phenomenal, it only has an average flow rate of 2.6 GPM, so it’s better suited as a POU unit. The water heater has an interactive touchpad on the front that displays the temperature since the water heater is a self-modulating unit. It also saves you up to 60% on your water heating costs.

Overall, this is a great option for those looking for a long-lasting, heavy-duty heater while still looking to cut back on additional costs.

3. Rheem RTEX-18 Professional Series 

240v tankless water heater
Dimensions: 18.25″ x 14.5″ x 3.5″
Weight: 8.5 lbs
Voltage: 240V
Amps: 40 A
Avg. Flow Rate: 4.4 GPM
tankless water heater setup

If quality is your primary concern, the Rheem #RTEX-18 is one of the best tankless electric water heaters on the market. It’s a professional series, meaning that it is suited for use in commercial applications as well as residential applications.

It consistently has some of the best reviews around.

Built as sturdy as a tank
It comes with two internal heating elements made of copper
It handles back-to-back showers seamlessly
It’s costly
It uses a lot of power compared to others

Threaded for easy replacement, simple installation, and boasting a digital temperature display, it is no wonder why this unit is of our top three units on the market. Rheem is an American company that is the largest supplier of water heater products in North America.

They’ve perfected the craft, consistently putting out the best every year. When you buy a Rheem, you know you’re getting the right product.

2. Stiebel Eltron Tempra

tankless water heater for your home
Dimensions: 4.6″ x 16.6″ x 14.5″
Weight: 19 lbs
Voltage: 240V
Amps: 150 A
Avg. Flow Rate: 4.5 GPM
inside of a tankless water heater

Steibel Eltron has been manufacturing water heating equipment for almost 100 years, and their experience shows in this Tempra Plus 36 electric tankless water heater. For example, they offer highly efficient heat pumps. Using their exclusive technology, the Advanced Flow Controlâ„¢, the Tempra Plus 36 water heater can guarantee hot water even in high-demand situations. It makes the Tempra Plus 36 the best for high-demand conditions.

It also happens to be great for cold climates since it can keep your water hot even when it’s freezing outside. The quality of the unit is impressive. It features copper heating elements and a copper cylinder. It’s heavy, but that’s because it uses thick, high-quality parts.

Copper heating elements and copper cylinder
Seven-year warranty
It features five lower-energy models available, from 12kW to 29 kW
Very expensive
The heater uses a lot of power

The technology in the water heater is just as impressive as the parts. The Tempra Plus is an extremely advanced electric water heater. Not only is it self-modulating, but it also has a microprocessor that will automatically slow the flow rate to make sure that you get a steady temperature of the water. It won’t slow it too much, just enough to keep the temperature up. It is truly a “smart” electric water heater.

1. Sio Green SIO18 Infrared

high-quality tankless water heater
Dimensions: 16″ x 9″ x 4″
Weight: Unspecified
Voltage: 240V
Amps: 80 A
Avg. Flow Rate: 4-6 GPM
tankless water heater buying guide

The Sio Green SIO18 has a good water flow of 4 GPM, but if you need a higher water flow, there is also a commercial version of this model, which has a flow rate of 6 GPM. Either version provides you with a high-quality tankless water heater that can work for your whole house.

Infrared technology
Low maintenance
Lasts longer than traditional electric tankless water heaters
If something goes wrong, a computerized system could be more challenging to fix
It’s an expensive system to say that it’s not a whole house water heater

The Sio Green infrared water heater is one of the latest advancements in the electric tankless water heater market. Because of the unique technology as well as the high-quality.

Instead of using heating elements, it uses the power of infrared technology and quartz elements to heat water. It eliminates the possibility of having metal heating elements breaking down over time in the water that runs through the water heater. Essentially, it leads to a longer-lasting water heater.

Overall, this is a great heater for those looking for more advanced features in an electric tankless water heater.



How Do Tankless Electric Water Heaters Work?

Tankless water heaters work by using electric elements to heat the water up as it travels through the pipes and reaches the unit. They deliver near-endless supplies of hot water and provide instant comfort.

Do They Save Money?

While their initial costs may be higher, they save money over time. Electric tankless water heaters can save tens to hundreds of dollars in water and electric bills.


Electric tankless water heaters are gaining popularity because all the advantages save you money and time. And while the upfront costs and maintenance may seem intimidating, in the long run, it is definitely worth it. The nine that we’ve provided in the list above are the best of the best. At Water Filters Advisor, we have something on the list for everyone, and we hope that this gets you going in the right direction for your perfect electric tankless water heater.