10 Best Electric Tankless Water Heaters of 2020 – Reviews & Top Picks

Last Updated on November 20, 2020

Instant tankless electric water heater installed_kensoftTH_shutterstock

If you’re on the fence about switching to an electric tankless water heater for your home, workshop, or office, you’ve come to the right place. An electric tankless water heater can save you money, and it has other benefits as well. Still, there are a few things you’ll want to consider before you swap out the time-tested water heater.

We’ve chosen 10 different brands of electric tankless water heaters to review for you to help you learn about the different options available. We’ll tell you about the features each one brings to the table as well as its pros and cons. After the reviews, we’ve included a short buyer’s guide where we take a look at the parts and components that make up a tankless water heater to see what’s important.

Join us while we take a close look at heating type, output capacity, installation, controls, and more to help you make an informed purchase.


A Quick Comparison of Our Favorites 2020

Image Product Details
Best Overall
Winner
Stiebel Eltron Tempra 12 Plus Tankless Water Heater Stiebel Eltron Tempra 12 Plus Tankless Water Heater
  • Continuous flow
  • Small size
  • Easy to operate
  • Best Value
    Second place
    Titan SCR2 N-120 Electric Tankless Water Heater Titan SCR2 N-120 Electric Tankless Water Heater
  • Easy to install
  • Energy efficient
  • Easy to use
  • Premium Choice
    Third place
    Sio Green SIO18 Electric Tankless Water Heater Sio Green SIO18 Electric Tankless Water Heater
  • Infrared heating
  • No coil to corrode or maintain
  • Digital display
  • Ecosmart ECO 18 Electric Tankless Water Heater Ecosmart ECO 18 Electric Tankless Water Heater
  • Durable
  • Easy to use
  • Self-modulating technology
  • ECOTOUCH Electric Tankless Water Heater ECOTOUCH Electric Tankless Water Heater
  • Heats water to 116 degrees
  • Adjusts power based on the flow rate
  • Digital display and touch control panel

  • The 10 Best Electric Tankless Water Heaters – Reviews & Top Picks

    1. Stiebel Eltron Tempra 12 Plus Tankless Water Heater – Best Overall1Stiebel Eltron Tankless Heater

    The Stiebel Eltron Tempra 12 Plus Tankless Water Heater is our pick for the best overall electric tankless water heater. This model is easy to operate and features a digital display. It features a continuous flow system that reduces water flow if the demand for hot water is too great, so there is no need to stop and allow the water to warm up. Its small size can fit in almost any home, and it’s so quiet you will hardly notice it running.

    It’s able to raise the temperature of your water to 140 degrees Fahrenheit, depending on how much and how fast you need it. The only real problem with the Stiebel Eltron Tempra 12 Plus Tankless Water Heater is that if your water source is not close to the wiring, it can be costly to install.

    Pros
    • Continuous flow
    • Small size
    • Easy to operate
    • Silent operation
    • Digital display
    Cons
    • Can get expensive

    2. Titan SCR2 N-120 Electric Tankless Water Heater – Best Value2Titan SCR2 N-120 Electric Tankless Water Heater 220 Volts

    The Titan SCR2 N-120 Electric Tankless Water Heater is our pick for the best electric tankless water heater for the money. This heater is inexpensive and easy to install if the heater is close to the electrical panel. The controls are easy to understand and it only has only two buttons to adjust the water temperature. It only turns on when it detects water moving through it, so the energy savings are huge.

    The downside to the Titan SCR2 N-120 Electric Tankless Water Heater is that it has a very slow flow rate and can take a long time to fill the bathtub. For the first few minutes, the temperature fluctuates a bit as well.

    Pros
    • Easy to install
    • Energy efficient
    • Easy to use
    Cons
    • Water temperature fluctuates
    • Slow flow

    3. Sio Green SIO18 Electric Tankless Water Heater – Premium Choice3Sio Green SIO18-220v

    The Sio Green SIO18 Electric Tankless Water HeaterSio Green SIO18 Electric Tankless Water Heater is our premium choice tankless water heater. This model is a bit more expensive than most of the others, but it features a unique infrared heating system that heats the water without the use of coils. Since the water does not pass over coils, there is no corrosion from mineral deposits and there is no need to flush out the system or change the coils, making the unit maintenance free. It’s easy to install and has an easy to read digital display for setting and maintaining water temperature.

    The only real downside to the Sio Green SIO18 Electric Tankless Water Heater is that it doesn’t produce hot water as quickly as the coil heaters, and if you live in the northern states, it will struggle to produce hot showers in the winter. Another small problem is the connections are for the UK, and while they do fit US fixtures, you may notice some leaking and require additional rubber washers.

    Pros
    • Infrared heating
    • No coil to corrode or maintain
    • Digital display
    • Easy to install
    Cons
    • Doesn’t produce a lot of hot water

    4. Ecosmart ECO 18 Electric Tankless Water Heater4Ecosmart ECO 18 Electric Tankless Water Heater

    The Ecosmart ECO 18 Electric Tankless Water Heater is a small, durable unit that’s easy to install. It’s also easy to use and features one knob temperature control. Self-modulating technology automatically controls the unit, so you only use the power you need. There are three heating elements to heat the water, but you don’t always need all three.

    The extra heating elements in the Ecosmart ECO 18 Electric Tankless Water Heater are a nice feature and help you get a lot of hot water quickly. Still, if your water is on the hard side, you will find that the copper coils corrode quickly and often need replacing, which can add up to a high cost during the lifetime of the unit. Each heating element also requires a spot in the electrical box, so it can use a lot of power if all three coils are in operation.

    Pros
    • Durable
    • Easy to use
    • Self-modulating technology
    • Easy to install
    Cons
    • Heating elements corrode and burn out quickly
    • Requires a lot of power

    5. ECOTOUCH Electric Tankless Water Heater5Tankless Water Heater Electric

    The ECOTOUCH Electric Tankless Water Heater is a compact unit that can quickly heat water up to 116 degrees. It automatically adjusts its power use based on the flow rate, which helps save power even when it’s in use. The digital display and touch control panel are easy to read and use, and it also includes a remote control, so you don’t need direct access.

    The downside to the ECOTOUCH Electric Tankless Water Heater is that it is not powerful enough for showers or baths, and is only for sinks. It lets you know that on the box, so it’s not misleading, but it still recommends a professional installation that we feel is expensive for a sink heater.

    Pros
    • Heats water to 116 degrees
    • Adjusts power based on the flow rate
    • Digital display and touch control panel
    • Remote control
    Cons
    • Only for sinks
    • Requires professional installation

    6. Bosch US3 Tronic 3000 Electric Tankless Water Heater6Bosch Electric Tankless Water Heater

    The Bosch US3 Tronic 3000 Electric Tankless Water Heater is a compact unit that delivers 3.4kW of heating power to warm water quickly. It’s a compact unit that’s easy to install and can be mounted vertically or horizontally for the best fit. There are no controls to adjust. You just install it and use it.

    While the lack of controls certainly makes the Bosch US3 Tronic 3000 Electric Tankless Water Heater easy to use, we prefer to have at least a minimal control over the water temperature. There is no display panel or other way to tell if the unit is working or what temperature it’s trying to achieve. It’s only good for one sink and maybe a washer, but not for showers, baths, or multiple sinks because it doesn’t put out enough hot water for those uses. We also found this brand randomly stops working periodically and requires you to remove the cover to press a hidden reset button, which is very inconvenient, especially if it’s in a small compact area that won’t allow the cover to come off without uninstalling the unit.

    Pros
    • 4kW output
    • Easy to install
    • Small size
    • Mounts vertically or horizontally
    Cons
    • Randomly stops working
    • No controls
    • Inconvenient reset button
    • Too small for showers

    7. Rheem RTEX-13 Residential Tankless Water Heater7Rheem 240V Heating Chamber

    The Rheem RTEX-13 Residential Tankless Water Heater is easy to install and comes with adapters as well as compression water fittings, so you won’t need to purchase anything extra. Two heating elements work to heat your water quickly, and you can control the temperature with its rotary thermostat. The digital display is clear and easy to read from a distance.

    The biggest downside to the Rheem RTEX-13 Residential Tankless Water Heater is that it’s not very durable, and ours stopped working after only a few weeks. Besides that, it worked well, but it only puts out enough hot water for one sink at a time. If we tried to use it in the shower, it would immediately blow the circuit breaker.

    Pros
    • Rotary thermostat
    • Digital display
    • Dual heating elements
    • Easy to install
    Cons
    • Not durable
    • Not good for showers
    • Trips the breaker

    8. Eemax EEM24013 Electric Tankless Water Heater8Eemax EEM24013 Electric Tankless Water Heater

    The Eemax EEM24013 Electric Tankless Water Heater is a self-modulating heater, which means it automatically adjusts how much power is used based on how much water is moving through the system. It’s a very compact unit, and it’s easy to find a place to install it. It has a durable stainless steel housing, and the rotary temperature control makes it easy to dial in your desired water temperature.

    Unfortunately, we had some problems with the Eemax EEM24013 Electric Tankless Water Heater, the biggest of which were leaky fittings. We tried several washers but were only able to minimize the water lost. It doesn’t produce enough hot water for a shower and is only suitable for sinks. Our control module broke after about two months, and though it’s replaceable, it was expensive and frustrating.

    Pros
    • Self-modulating
    • Compact size
    • Rotary temperature setting
    • Stainless steel construction
    Cons
    • Leaky fittings
    • Only good for sinks
    • The control module burns out

    9. Marey Power Pak Plus Tankless Electric Water Heater9Marey Power Pak Plus Tankless Electric Water Heater

    The Marey Power Pak Plus Tankless Electric Water Heater is an extremely compact model that can fit under most sinks. It only comes on when it detects water moving through the system, and you can adjust the power usage when it does turn on by a rotary dial. It features four power levels, so it’s easy to get the perfect water temperature. You can also set how much water needs to pass through the system before the heating element turns on, and the inlet hose has a filter to trap incoming sediment.

    The downside to the Marey Power Pak Plus Tankless Electric Water Heater is that it’s only for a single point, which means you can only use it on one sink. It doesn’t put out enough hot water to use in the shower or the washer, so it’s best suited to the kitchen.

    Pros
    • Adjustable power consumption
    • Easy to use
    • Compact size
    • Filter on the inlet
    Cons
    • Only for sinks
    • Doesn’t get very hot

    10. Camplux TE27 Electric Tankless Water Heater10Camplux Electric Tankless Water Heater

    The Camplux TE27 Electric Tankless Water Heater is the last model of electric tankless water heater on our list, but it still has a few features worth mentioning. This model activates very quickly when it detects water moving through the unit to slow down the wait time for hot water. It can heat the water to 125 degrees, and you can easily see when it’s working and what temperature it’s set at with its bright LED display. You can set the temperature by touch control, and this model also comes with remote control. It also remembers your preferred temperature and works to maintain it. You can mount it at any angle to improve the chances of installation.

    Unfortunately, the Camplux TE27 Electric Tankless Water Heater is very expensive, and there are several cheaper models on this list. It also doesn’t put out much hot water, so it’s only good for a sink and possibly the washing machine, but it uses a lot of power.

    Pros
    • Remote control
    • Touch control
    • Can heat water to 125 degrees
    • Quick activation
    • Multi-angle mounting
    • Remembers your favorite temperature
    • LED display
    Cons
    • Expensive
    • Doesn’t put out much hot water
    • Requires a lot of power

    Buyer’s Guide

    Let’s look at some of the more important things to look for when choosing your next tankless water heater.

    Size

    Size is naturally the first thing most people look at when choosing a water heater, and by that, we mean how much water it can heat. Some heaters on this list are single-point operation, which means it will heat the water at one location. These units are good for the office or a workshop, but they are of little use in a household with more than one bathroom, a washing machine, and several people taking showers every day. For large amounts of hot water, you’ll need a whole house water heater. In our reviews, we tried to list models that were single-point devices.

    Heating Method

    The most common way to heat water in an electric tankless water heater is by moving the water through copper electric coils, not that different than the heating element in an electric blanket. As the water passes through the electrically heated coils, it gets hot. The more coils there are, the hotter the water can get, and the more water can be heated.

    The second-way electric tankless water heaters heat the water is by using infrared technology. These heaters are often much more expensive than the copper coil type, but the coil doesn’t corrode with hard minerals, and it can last a lot longer. However, these heaters do not usually perform as well as their copper counterparts.

    Installation

    Installation is always a concern. Most of the units on the list are very easy to install and only require a minimal amount of effort. The tricky part is connecting the heater to your circuit breaker, and many people will opt for professional help, which will add a few dollars to your total cost. Another thing to consider is the distance between the heater and where the water is needed. A longer distance will put more strain on the system to keep the water hot as it travels through the pipes. This distance may require a stronger heater, and it may also require additional insulation, which can also increase the overall cost.

    Advantages of an Electric Tankless Water Heater

    Here are a few of the advantages of an electric tankless water heater.
    • Huge energy savings because only the required water is heated.
    • The compact size fits almost anywhere, even under the sink, unlike a traditional water heater that can be quite large.
    • You get endless hot water because it’s heated as needed, unlike a traditional water heater that stores a finite amount and can run out.
    • The water is fresher because it’s never sitting in a tank.
    • Tankless heaters have more serviceable parts than a traditional heater.

    Conclusion

    In our reviews, the Stiebel Eltron Tempra 12 Plus Tankless Water Heater delivered the hottest water consistently to the most points in our home and is our top choice. It also features continuous flow technology that automatically slows down the water if you’re draining it too fast, so you never run out of hot water. If you’re looking for something on a smaller budget and don’t mind waiting for the tub to fill, the Titan SCR2 N-120 Electric Tankless Water Heater is an excellent choice and is our selection for the best tankless water heater for the money.

    We hope that we have helped you, and you have picked a favorite model. If you have enjoyed reading and think it can help someone else, please share this guide to the best electric tankless water heaters on Facebook and Twitter.


    Featured Image Credit: KenSoftTH, Shutterstock