15 Best Electric Tankless Water Heater Reviews in 2021


If you would like to bring a contemporary touch to your house or workplace, purchasing electric tankless water heaters should be at the very top of your list. Many working and living units have the comforts of water heating methods that use storage tanks. On the other hand, the long-term expenses of keeping hot water far simplify installing and utilizing the best product.

Every house and homeowner differs, and that’s why we’ve assembled an extensive purchasing guide that will help you determine the ideal make and model to suit your requirements.

In this guide, we have emphasized the attributes worth looking into, in addition to the 15 best electric tankless water heaters worth checking out.

List of 15 Best Electric Tankless Water Heater Reviews

1. Rheem RTEX-18 18kW 240V Electric Tankless Water Heater

  • Rheem’s water heater is also an efficient tankless water heater that could be used both indoor and outside. It can offer simultaneous hot water to two showers and two taps.
  • The device itself has a simple design and is simple to install. The compact layout of the water heater lets you join it in almost any small to moderate size area.
  • The water heater self-modulator corrects the capability to supply the desired water temperature. You will find two highly effective aluminum heating element which could supply 4.4 gallons per second hot water stream.
  • You are able to control the water temperature is 80 degrees Fahrenheit to 140 degrees Fahrenheit using a 1-degree increment. It’s possible to put your preferred water temperature using an easy turn of a knob. With its broad assortment of temperature settings and 99.8% energy efficiency, it saves on the electricity bill.

2. EcoSmart ECO 27 Electric Tankless Water Heater

  • Inspired by these electric tankless water heater inspections, it’s won many hearts regardless of having a lot of money. However, no matter how good the reviews are, we will determine whether this item deserves your cash or not just after assessing its own features.
  • Based upon the warmth in your region, the ECO 27 tankless electric water heater may churn out 3 — 6GPM of water. While its water distribution numbers are remarkable, the ECO 27 is not especially renowned for them. What’s made it a darling of its customers is your patented Self Modulating technology.
  • According to its title, this technology enables the heater to correct its inner temperature dependent on the hot water requirements. To put it differently, if the weather is chilly and you’re demanding a lot of hot water, then the heater will have more energy than ordinary to satisfy your requirements.
  • Conversely, in case the weather is somewhat warm, and your hot water needs have fallen, the heater will probably need less energy than ordinary to continue. When coupled, both of these factors imply that, overall, this heater will have less energy than your typical electric tankless unit.
  • Finally, to select the energy savings into a completely new level, ECO Smart has supplied this heater with aluminum and stainless steel components. Along with not rusting, these two components need less energy to warm up. Because of this, even a small source of power is going to lead to searing hot water.

3. Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric

  • Among the business leaders, Stiebel Eltron introduces this top-notch heater. It includes a slightly higher price compared to ECO 27, but it is a fantastic match for people who prefer guaranteed quality. The Tempra 24 Plus is a highly effective whole-house water heater.
  • Its sleek German layout is married to top-notch German engineering. This electric tankless water heater can meet many domestic hot water requirements.
  • This product has an upgraded temperature display with mouse buttons. Its capacity to provide endless hot water for your household is dependent upon your groundwater temperature. In case your groundwater temperature is 52 °F, it is possible to anticipate a 3.1 GPM hot water flow speed. Therefore that you can safely run two showers simultaneously. In case your groundwater temperature is 62 °F, it is possible to anticipate a 3.8 GPM hot water flow speed. Thus, you can safely conduct two showers and a sink at precisely the exact same moment.
  • You’ve got to pay a large upfront cost with this particular electric tankless water heater, and — when compared with this ECO 27 tankless water heater — it provides marginally lower pressure flows. It is the top-quality workmanship and also the exceptional Advance Flow Control feature that makes this worthwhile.

4. Rheem 240V 4 Heating Chambers RTEX-36 Residential Tankless Water Heater

  • Rheem is a worldwide leader in regards to water heaters. The business was in business a very long time, and over the years, they have built a reputation as a luxury participant. They fabricate tankless systems which may deliver considerable quantities of hot water, and they back their components using a strong 5-year heat exchanger / 1-year parts limited warranty.
  • The RTEX 36 is the largest tankless platform in Rheem’s RTEX line-up. It’s four durable aluminum immersion heating components with brass tops. In the event you need to substitute one, they are threaded for simple field replacement and removal.
  • This item is capable of providing around 8.8 gallons of hot water each minute; it may handle as many as 5 showers and two taps depending upon your geographical location.

5. Marey Power Pak Plus Tankless Electric Water Heater

  • If you’re interested in a way to warm water to less and you live in a place using a warm climate, this cheap electric tankless water heater may be a terrific choice.
  • It’s simple to install and use. We enjoy the easy and uncluttered controls — it will not give you tons of unnecessary extras, which you most likely don’t require. On the contrary, it keeps matters as simple and straightforward as you can.
  • It’s a rather large efficiency rating, letting it help save up to 60% on your invoices. Additionally, it has a filter on the inlet, helping protect against damage from sediment and making sure it’s going to keep working for more. This device can provide hot water to get numerous fittings concurrently — despite the fact that it’s very important to know its limitations.
  • Another thing to keep in mind is the fact that it may not have sufficient heating capability to supply hot water for a bath — that is only because bathrooms have a greater flow rate than showers. Also, this version may not have the ability to warm the water quickly enough.
  • To summarize this could be a superb solution for heating water for a little home in a tropical area or rather as a point-of-use heater anyplace cooler. But should you require a heater to get more intensive usage or in a colder region, this unit is most likely not the ideal solution for you.

6. Titan SCR2 N-120 Electric Tankless Water Heater

  • The N-120 edition of this Titan hot water heater program outdone all its old versions. It’s a quick two hundred twenty volts (V) electric tankless water heater constructed to provide your house or office with a considerable number of hot water at a really low cost.
  • Weighing only eight pounds, there’s absolutely not any surface or wall it can’t be installed, and using a tan metal end, it blends well with any room’s design.
  • Titan gives you up to sixty Hertz (Hz) or eleven stages eight kiloWatt (kW) of exceptionally hot water flow speed to fulfill your requirement for hot water.
  • What is best is that this hot water heater will heat the water source just once you require it, therefore no need to be concerned about your electric power use for the unnecessary heating system. I really could recommend N-120 to people who desire a quick solution for cutting prices and are constantly concerned about electricity invoice rates.

7. EcoSmart ECO 11 Electric Tankless Water Heater

  • The EcoSmart Electric Tankless Heater comes in many distinct sizes, which offer a range of GPMs. This is great for anybody who wants to adhere to the EcoSmart manufacturer but tailor their product to match them.
  • What is more, the boundless warranty actually shows us that the business takes pride and has faith in its own product. You can get just about any portion of the merchandise fixed or replaced at no additional price. Therefore, it appears that this product does not only save money through reducing energy expenses but in different ways also.
  • Our confidence in this item can be doubled by the massive number of favorable reviews it’s received. To top it off, this really is actually the tiniest product on the list — it is ideal for a smaller house.
  • This choice has among the cheapest GPMs on our listing. Even though 1.5 GPM is enough to get a little home–maybe a flat –it will not do for a growing family dwelling. If you are trying to cultivate your loved ones or have a bigger household, this choice will not see you get through the wintertime.
  • But if you prefer the EcoSmart brand, however, fancy a greater GPM, then they have a lot of choices to accommodate you. Yes, they’re more costly, but that is anticipated to get a greater GPM.

8. BLACK+DECKER 18 kW 3.7 GPM Electric Tankless Water Heater

  • Your older water heater was operating for several decades, but regrettably, its time is up. If you are searching to replace it using a tankless one, then you may want to take a look at the Black and Decker BD-18-DWH Electric Tankless Water Heater.
  • This water heater is powered with electricity, which makes it somewhat easier to set up. Its highest flow speed reaches around 3.7 GPM, making it perfect for smaller or midsize houses with fewer household members. It sports self-modulating technology and seems fairly clean and compact.
  • The cost is very affordable for most homeowners. The inside meeting is durable and made from stainless steel. Turning it off is as simple as pressing a button as is adjusting the water temperature.

9. Ecosmart ECO MINI 2.5 2.5-Gallon 120V Electric Mini Tank Water Heater

  • This item from EcoSmart includes a layout fitted because of its title — streamlined and compact, designed to fit nearly anywhere inside your residence.
  • The water heaters of this ECO MINI series are thought to be 99.8% energy efficient. Judging by the number of favorable reviews and from the simple fact that this version is Amazon’s Choice in relation to water heaters, we could presume this to be authentic.
  • Reportedly, this water heater is rather simple to install and does not take lots of know-how — only a small bit of instinctive understanding. It’s fabricated from the United States, has an amperage capacity of 12 A, also runs on 120V.

10. Bosch WH27 Tronic Whole House Electric Tankless Water Heater

  • Bosch provides two tankless water heating systems, a whole house, and a point-of-use. Regarding ease of use, efficacy, and outstanding heating output signal, the Bosch WH27 Tronic is a distinctive electric tankless system.
  • The Bosch WH27  is a superb selection for a home with 2-3 baths and can manage maximum temperature output signal for 3 concurrently running taps. The polymer-based heating components on this system regulate the warmth to have a constant, even heat all of the time.
  • The polymers do not only help this version maintain the hot water at a constant temp. In addition, but it also produces the Bosch WH27 Tronic among the most lasting choices available on the market. The brand asserts it will endure for a minimum of 20 decades, and as it’s so energy-efficient, using an EF of .97, it will always save you money within its life.
  • Even though you can not use plastic or PEX stuff in your sink fittings using ultra-hot heating components, it’s quiet and lightweight. When it is in, you won’t even know it is there, except for your own always hot water gushing out of your taps.
  • Each product includes a 15-year guarantee on the heating condenser, which’s the element that heats the water from the pipes. The tiniest Bosch unit may handle a flow rate of 8.3 using a temperature increase of 35˚F. The most significant unit can manage 12.1 GPM and contains a higher energy efficiency of 98.
  • A perfect pick for an ordinary family with manageable water use demands, a Bosch WH27 Tronic is lightweight, effective, and also a fantastic investment.

11. Bosch Thermotechnology – WH27 Tronic 6000 C Electric Tankless Water Heater

  • As one of those top-tier brands when it comes to home appliances, Bosch comes with a handy way to heating water without having a great deal of room. With the support of this best electric tankless water heater, you will have the ability to present your entire home safe, temperature-controlled water without needing to rely on gasoline.
  • The Bosch Tronic 6000C includes an easy, user-friendly interface; also, it is intended to substitute a 40-gallon electric tank-style water heater. Based on Bosch’s Sizing Chart, the WH27 version ought to be able to accomplish a 3.5 GPM using a temperature increase of 45F.
  • The 6000C WH27 was created to immediately replace the Bosch Tronic 5000C WH27. Additionally, it is also going to replace two older versions in Bosch’s line-up: The Bosch PowerStar AE125 along with the Powerstream Pro RP27PT. The dimensions and fittings are somewhat different for both older versions, so some alterations could be necessary.

12. Sio Green IR288 v2 POU Infrared Electric Tankless Water Heater

  • The Sio Green SIO18 Electric Tankless Water Heater is our superior alternative tankless water heater. This version is somewhat more costly than the majority of the other people, but it includes a distinctive infrared heating system that heats the water without using coils. Considering that the water doesn’t pass over coils, there isn’t any rust from the mineral residue, and there’s absolutely no need to flush the system out or adjust the coils, which makes the device maintenance-free. It’s simple to install and has an easy-to-read digital screen for placing and maintaining water temperature.
  • The sole drawback to this Sio Green SIO18 Electric Tankless Water Heater is the fact that it does not create hot water as fast as the coil heaters, and if you reside in the northern countries, it is going to fight to create hot showers in the winter. Another little problem is that the links are for the UK, and while they do match US fixtures, you might observe some leaking and need extra rubber washers.

13. Bosch Electric Mini-Tank Water Heater

  • If you’re trying to find a mobile product that could be set up in RV, then search no more. Bosch mini tankless water heater is a handy and compact size water heater.
  • It supplies up to 7 gallons a minute hot water stream, along with the tiny compact design that lets you match it directly under the sink. It is a point-of-use electric tankless water heater program and comes in 3 distinct sizes.
  • Multiple water heating options deliver hot water for a family of 5 and over. The rapid heating technology warms water directly when you want it.
  • The lightweight and compact design of this heater let you install it to the ground, wall, or shelf mount it (except the 7-gallon version ). Additionally, it is a great tankless water heater for outside vehicles such as RVs. It’s possible to put it nearer into the sink under the sink that saves valuable indoor RV space.
  • You may use it as a standalone heating source close to one sink or may supplement it with a present heater. The top energy-efficient heating system ensures it uses less electricity and keeps the heating bill.

14. Atmor 18kW / 240V Electric Tankless Water Heater

  • As it’s relatively new in the current market, the Atmor AT –D18TP is among the cheapest tankless electric components. Provided that you enjoy the undermentioned characteristics, you’ll find a top-notch heater at a below-average cost.
  • Without sounding disrespectful, just a handful of people appreciate safety when picking tankless heaters. Fortunately, as signaled by its IP54 Certification, this heater worth our security over many people.
  • This certificate suggests you could put in it near showers and sinks because the heater is splashproof. In other words, along with providing you the energy savings of a tankless unit, this heater — thanks to its closeness with all the taps, will also provide you the liberty as supplied by heaters.
  • In the event that you were wondering, worry less security is not the only large point of the heater, a fact underlined with its Smart Flow technology. This technology enables the heater to provide unlimited hot water without resulting in a temperature reduction.
  • Aside from providing infinite water streams, the Smart Flow technology may also bring about energy savings. For, the heater is only going to turn ON the instant that you turn the hot water faucet ON, simply to switch off the heating system as soon as you switch off the faucet. Consequently, it will not be swallowing bucks while sitting idle.
  • Another quality of this heater worthy of your focus is your Self-Modulating technology. As the title may indicate, this technology modulates the energy needed by the heater to warm water. Consequently, your electricity bill will return.

15. Atmor AT-910-27TP ThermoPro 27kW/240V Electric Tankless Water Heater

  • We could not abandon the Atmor ThermoPro off our listing! This item is capable of delivering around 5.4 gallons of hot water each minute, sufficient to run two showers, 2 bath sinks, plus one kitchen sink in precisely the exact same moment.
  • Even if the water temperature is as low as 37°, the Atmor could provide an impressive 2.6 GPM. The 27kW is the biggest of those three ThermoPro versions in Atmor’s line-up and necessitates three 40-amp double pole breakers.
  • Both heating systems permit the unit to optimize it has energy efficiency, and since the inside of the modules is stainless steel, so they are resistant to rust and incredibly durable.
  • The Atmor Thermopro is a good performer and a fantastic option if you’re looking for a whole house electric tankless water heater.

How To Choose The Best Electric Tankless Water Heaters


GPM would be the Gallons Per second you will receive out of the electric tankless water heater. Bear in mind; you can not think concerning capacity since there’s not any storage tank. You need to consider concerning water stream at any 1 time. To put it differently, how many fittings are you going to be using simultaneously.

In brief, your incoming water temperature and the sort of fittings you use at once will ascertain your perfect GPM. Should you want to get a shower operating in precisely the exact same period as your dishwasher, then that can affect your perfect GPM.


Size is also an important element. You have to have the ability to place your best electric tankless water heater at a place in the bathroom or somewhere in the home that it is available to all other chambers which are in need of hot water. That is why it’s crucial that you search for compact choices if you reside in an apartment and therefore are restricted in the distance.


Each manufacturer of tankless water heaters provides their customers varied warranties which may vary from 1 version to another. For example, some companies would like you to find a professional to set up your unit to get their warranty to use.

It would be best to make a comparison of the several guarantees available before settling on a version. In the end, an organization’s commitment to client satisfaction highlights their confidence in the versions they fabricate.

Flow rate

Flow speed requirement is determined by the number of taps and water-using appliances you’re planning to use concurrently. The showerhead and dishwasher require two GPM, and also the washing machine requires involving 2-2.5GPM.

To understand this clearly, let us say you will run two showers simultaneously. Thus, you’ll require a heater that’s capable of generating heat water up to 5GPM. Should you put a dishwasher into the listing, then the essential GPM would go around 7 GPM, and you’ll want to buy the tankless heater, which provides hot water at the speed of around 7 GPM.

Create the record of appliances you would like to operate and include up their GPM. You’ll find a crystal clear picture of just how much flow speed your home requires.

Energy Efficiency Ratings

Electric tankless water heaters may be ruthless power customers. If you particularly have a whole-house tankless electric water heater, make sure you only opt for a model with the best energy efficiency evaluations. Normally, the ratings vary from 78-87 percent, and a device using the greatest ratings means that it converts more energy to heat at a quicker speed.


Electric tankless water heaters are among the most frequently selected water heating systems because of their advantages. It is advantageous for your loved ones as well as your savings because it uses much less energy if you compare them to conventional water heaters.

These 15 versions of our were selected since they are this season the most well-known goods in the marketplace of this business. The best electric tankless water heater testimonials have been composed on the grounds of profound contrast and research of frank consumer opinions. So if you’re searching for an entire house item or a stage of usage unit, We hope this guide has been useful to you.

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