What Is The Best Whole House Electric Tankless Water Heater?

Best Whole House Electric Tankless Water Heater Reviews 2022

  • Heroes in the field of home heating Some of the links on this page are affiliate links, which means that if you click on them and make a purchase, we will get a commission at no additional cost to you. More information may be found here. Your Complete Guide to Heating and Cooling Systems in the Home The most recent update was made on February 10, 2022. You may be certain that whenever you turn on the shower or the sink faucet, you will always have hot water. Because these goods do not have the large tanks that conventional units have, they take up less room than typical units on the shelf. Examining product reviews is an excellent approach to learn what other consumers thought of the things that they purchased for themselves. Reading those evaluations aided us in our decision to purchase the Stiebel Eltron Tempra Plus as the most suitable model. It contains a digital temperature control that allows you to choose the temperature of the water, as well as a small design. Learn more about this model, as well as about all of our other top options. The Most Appropriate Option Tempra Plus 29kW from Stiebel Eltron Check out PricePROS for more information. Designers use a minimalistic approach to their work.
  • SPECIFICATIONS Dimensions: 16.54 x 4.61 x 14.53 inches
  • voltage: 240A
  • flowrate: 0.77 GPM
  • breakers required: 3 x 40 A DP
  • voltage: 240A
  • flowrate: 0.77 GPM
  • SAMPLE SPECIFICATIONS Dimensions: 16.54 x 4.61 x 14.53 inches
  • Voltage: 240 Amperes
  • Flowrate: 0.77 GPM
  • Breakers required: three 40 Ampere direct current breakers
  • SPECIFICATIONS Wattage: 19000 W
  • Weight: 16.1 lbs
  • Flowrate: 2.1 GPM
  • Voltage: 240 A
  • Dimensions:
  • Eemax ElectricCheck PricePROS Eemax Electric High-quality construction
  • a clean and contemporary appearance
  • a compact design
  • SPECS Operational pressure: 25 pounds per square inch (PSI)
  • digital temperature display
  • Weight: 11.2 lbs
  • power consumption: 18 W
  • SPECS Operating pressure is 25 PSI
  • a digital temperature display is provided
  • and
  • 18-watt power supply. 11.2-pound weight.
  • Dimensions 15.5 4.5 12 inches
  • Wattage: 17000 W
  • Voltage: 208 V
  • Environmentally friendly EcoSmart ECO 11Check PricePROS Lifetime warranty
  • unlimited hot water
  • more storage capacity
  • DIMENSIONS WEIGHT 6.5 LBS DIMENSIONS 11 5 8 3 7 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5

8 Best Whole House Tankless Water Heaters Reviews

1. Stiebel Eltron Tempra Plus 29 kW Whole House Tankless Electric Water Heater – Top Pick

  • There are a variety of models available from Stievel Eltron, although the most of them have a low flow rating.
  • Because of its greater flow rate, which allows you to use up to six gallons per minute, this one is at the top of our list for the most important reason.
  • In the event that you need to run more than three gallons of hot water per minute from two different sinks or tubs at the same time, it will still be plenty.
  • With its small footprint, the Tempra Plus takes up less space in your utility room and does not require any additional ventilation to operate.
  1. There’s a knob on the front of it that indicates which temperatures are appropriate for washing your hands and utilizing in home or business premises.
  2. As an added bonus, you’ll get a digital temperature control that will allow you to set the ideal temperature for your house while still staying within one of the temperature rankings.

2. Stiebel Eltron 224198 240V Whole House Tankless Electric Water Heater

  • Tempra 20 Plus from Stiebel Eltron is another solid alternative for individuals seeking for a product that is capable of supporting a household.
  • This product has a little lower flow rating, but it is still a decent choice.
  • When used in conjunction with a faucet or shower, it may produce up to four gallons of hot water per minute on demand.
  • If you need to utilize two or more applications at the same time, the flow rate will be reduced to 2.1 gallons per minute, according to the manufacturer.
  1. Although similar in design to our top-of-the-line model, the Tempra 20 Plus can cut your overall water heating expenditures by up to 20% while still providing you with all of the hot water that you and your family require.
  2. This model includes the same temperature settings and digital display as our top-of-the-line pick, as well.
  3. It is possible to set the temperature to a specific temperature or to modify it to a temperature range that is appropriate for your building by turning the dial.

3. Eemax GIDDS-1030379 HA018240 Whole House Tankless Water Heater

  • Tempra 20 Plus from Stiebel Eltron is another solid alternative for individuals seeking for a product that is capable of supporting a household.
  • This product has a little lower flow rating, but it is still a decent option.
  • With a faucet or shower, it may deliver up to four gallons of hot water per minute when properly connected.
  • The flow rate will reduce to 2.1 gallons per minute if you need to utilize two or more applications at the same time, depending on the situation.
  1. This water heater, which is similar in design to our top model, can cut your overall water heating expenditures by up to 20% while still providing you with enough hot water for your entire family.
  2. It has the same temperature settings and digital display as our top-of-the-line model, and it costs the same.
  3. It is possible to fix the temperature to a specific temperature or to change it to a temperature range that is appropriate for your building.

4. Bosch Electric Whole House Tankless Water Heater

  • It is made by Bosch and is available in both single application units and whole house versions such as this one, which supplies you with all of the hot water that you require at any point of usage in your home.
  • With a thermal efficiency rating of 97 percent, this model assists in ensuring that the water comes out at a high temperature and that it remains at that degree until the water is turned off completely.
  • This also reduces the amount of time you have to wait for hot water, something you may have experienced with previous models.
  • It is essentially a built-in sensor that monitors the flow of water and guarantees that the water comes out at the temperature that you choose.
  1. The outside of the case is equipped with a knob that can be rotated in either direction to adjust the temperature to the level that your family finds comfortable.
  2. It also comes with all of the necessary gear for installation and operation, including connectors for pipes on the bottom and mounting hardware.

5. EcoSmart ECO 11 Whole House Tankless Water Heater

  • Homes in the south and other places with higher temperatures will benefit from the ECO 11 unit from EcoSmart, which is available from the firm.
  • EcoSmart also manufactures a variety of other units that can heat your entire home.
  • It is equipped with a cold water input on one side and a hot water exit on the other.
  • The water that you use enters through the inlet, travels through the copper components within, and then over the heat exchanger, which heats the water to the desired temperature before exiting through the outlet.
  1. It works best in houses where the groundwater temperature is at least 67 degrees Fahrenheit, and while it will operate in lower climes, the groundwater temperature will have an impact on the flow rating.
  2. It has a maximum flow rate of two gallons per minute and performs admirably when used with sinks and other similar fixtures.
  3. It is possible that this rating will be reduced to less than two gallons per minute when utilized with a shower head.

6. iHeat Tankless S-16 Whole House Tankless Water Heater

  • The Tankless S-16 from iHeat weighs only 7.5 pounds, making it one of the lightest units available on the market.
  • Because of its lightweight construction, you may install it on any wall without having to worry about it falling down and destroying your plaster.
  • This 16 kW model is the largest and most powerful product offered by the firm, and it is capable of supplying a constant stream of hot water to many sinks, tubs, and showers at the same time.
  • With the ability to reduce water heating expenditures by up to 60%, the S-16 is an excellent choice for usage in your house.
  1. However, due of its ease of installation, it can also be used in a boat or recreational vehicle as well.
  2. It has the ability to heat up to 3.5 gallons of water every minute and provide you with access to that water, which is a high enough flow rate to be used with a bigger shower head.
  3. This type is suitable for homes with a maximum of 2.5 bathrooms.

7. Bosch AE115 PowerStar 2.6 GPM Indoor Whole House Electric Tankless Water Heater

  • Not everyone who requires a whole-house water heater does so in order to accommodate a larger home, and those who live in smaller houses will welcome the Bosch PowerStar AE115 water heater.
  • Considering that it has a maximum flow rate of only 2.6 gallons per minute, this model is an excellent choice for individuals who only use one application at a time.
  • There’s no need to worry about running out of hot water when taking a shower or doing dishes.
  • This PowerStar product is designed for use in regions where the groundwater temperature reaches a minimum of 60 degrees Fahrenheit.
  1. It can also be used in cooler locations, albeit the flow rate will be lower.
  2. It has a 90 percent energy efficiency rating, which means it will help you save money on your heating expenses as well.
  3. Also included with this tiny model is the hardware necessary for mounting it on a wall, allowing you to preserve valuable floor space in your utility or laundry room by eliminating the need to move furniture.

8. Sio Green IR288 POU Infrared Whole House Tankless Electric Water Heater

  • The choice between a point of use and a whole home hot water heater is often limited to two options; however, our SioGreen product allows you to utilize the same model for both applications!
  • As a point-of-use device, you may install it directly beneath your sink or connect it to your shower to supply hot water to either area.
  • It may also be used as a whole-house model that can supply water to several applications at the same time.
  • When using this model, the maximum flow rating will vary depending on the temperature of your groundwater.
  1. The flow rate will be 2.2 gallons per minute if the temperature of the groundwater needs to be raised by 30 degrees, but if the temperature of the groundwater needs to be raised by up to 60 degrees, you’ll still obtain more than one gallon of hot water each minute.
  2. Non-metallic components inside the system even lower the likelihood of germs and algae being released into the environment with your water.
  3. With regard to electric tankless water heaters, we have determined that the Stiebel Eltron Tempra Plus is the model to consider purchasing.
  4. In addition to a convenient dial on the front that allows you to choose between temperatures ideal for domestic applications and those suitable for commercial buildings, the unit incorporates a digital temperature control.
  5. This control allows you to set the temperature to a certain level..

In terms of maximum gallon per minute flow rate, this model can handle six gallons per minute.Even if you need to utilize hot water in many rooms at the same time, you’ll still obtain a rating of more than three gallons per minute from your water heater.In terms of performance, the Tempra Plus is the greatest whole-house electric tankless water heater on the market today.In order to earn advertising money, Homeheatingheroes.com has joined the Amazon Services LLC Affiliate Program, which is designed to offer a mechanism for websites to earn advertising fees by advertising on and referring to amazon.com (the ″Amazon Site″).

8 Best Whole House Tankless Water Heater in 2022 – Waterheaterbuzz

  • The frigid winter days are one of my favorite parts of the year, and I’m sure many of you like as well.
  • However, there is one aspect of the season that causes us all nightmares.
  • Yes, you are correct in your guess!
  • It’s those chilly early morning showers with frigid water.
  1. But don’t be concerned!
  2. This winter, I’m going to make certain that you’re well-prepared in advance.
  3. To ensure that your winters are perfectly beautiful this year, I offer the ideal option for you: water heaters!
  4. Tankless water heaters in particular are advantageous since they take up very little space.
  5. The usage of whole-house tankless water heaters is an excellent alternative to the use of conventional heaters that are integrated with tanks.

Electric water heaters and propane gas water heaters are two distinct types of water heaters that are available on the market.While gas models require venting, newer electrical units do not require venting and are characterized by their sleek and small appearance, as opposed to gas counterparts.In this regard, the following are the eight best whole home tankless water heaters in 2021, based on features such as self-modulation, changeable temperature, dual heating elements, and installation procedure:

1. EcoSmart ECO 18 Electric Tankless Water Heater

  • Favorite Selection Ecologic Smart’s ECO 18 Electric Tankless Water Heater is available in a number of sizes, making it suitable for a wide range of residential applications ranging from small to big.
  • Also advantageous is the fact that it is both cost-effective and readily available at a reasonable price throughout the market.
  • Therefore, it can be used as a cost-effective alternative to more expensive items.
  • We are confident that you will not notice a significant difference in the performance and efficiency of this water heater.
  1. This, together with the temperature settings that are fully adjustable, allowing you to customize the temperature to meet your specific requirements.
  2. The temperature may be changed between 80 and 140 degrees Fahrenheit by turning the huge knob on the top of the machine to the desired setting.
  3. Aside from that, self-modulating technology is an important component of the system that adds to its energy-saving capabilities.
  4. Controlling your energy use is advantageous for both the environment and your bank account.
  5. As a result, we strongly suggest it for everyday use, especially if you wish to reduce your power use.
See also:  How Much Propane Does A Tankless Water Heater Use


  • Limited lifetime warranty
  • Durable
  • User-friendliness

The EcoSmart ECO 18 Electric Tankless Water Heater has been tested and certified to meet UL Standard 499 safety standards, and it does not pose any safety risks. Furthermore, the controls are simple to use and do not want the assistance of an expert. Because of this, it is simple to install and operate, even if you have no previous knowledge in this area.

2. Stiebel Eltron Tankless Water Heater

  • The Stiebel Eltron Tankless Water Heater is another another outstanding product that deserves to be featured in the top ten list of the finest whole house tankless water heaters available.
  • It is, on the other hand, on the more expensive end of the scale and may need you spending a few extra bucks in order to acquire it.
  • The innovative flow control technology integrated into the tankless heater is capable of maintaining the water temperature on its own without human intervention.
  • Because of this, you will not be concerned with changing the temperature of your device on a regular basis.
  1. In a similar vein, the small design and strong foundation prevent it against damage and leaking, allowing it to survive for far longer periods of time than you may imagine.
  2. In addition, the model does not require any venting and is equipped with self-modulation technology, which can be used to control the flow of water if desired.
  3. This also contributes to the simplicity of use, making it suitable for a wide range of customers.
  4. Its capacity to reduce noise, which makes it more suitable for usage at nights, is another something we enjoy about the item.


  • Energy-efficient
  • Multiple size options
  • 7-year warranty


  • Requires regular maintenance

Despite its small size, the Stiebel Eltron Tankless Water Heater delivers exceptional performance and efficiency. It is equipped with digital controls and a solid copper heating system, which allows it to deliver a limitless supply of hot water and may be used as an alternative to classic tank-style water heaters.

3. Rheem RTEX-18 Electric Tankless Water Heater

  • The Rheem RTEX-18 Electric Tankless Water Heater is our top suggestion for anybody looking for a heating device that requires the least amount of upkeep.
  • There is a successor to the RTEX-13 water heater, which is smaller in size and more suited for on-demand use.
  • Specifically, the producers created this model in order to overcome the constraints of its predecessor and give a tankless heater that can be used throughout the entire house.
  • The device is simpler to operate and is well-known for its hassle-free controls and ease of operation.
  1. The output temperature may be adjusted with the use of a dial control situated on the front panel.
  2. In addition, self-modulation reduces energy consumption, which in turn leads to a reduction in the total heating expenses associated with the system.
  3. Consumers may also customize the temperature to meet their specific needs and preferences.
  4. When the temperature rises to 62 degrees Fahrenheit, it is possible to obtain a flow rate of 2 Gallons per minute.
  5. You have the option of customizing the temperature and flow rate to meet your requirements.


  • UL standard safety certification
  • simple installation
  • dual heating elements
  • UL standard safety certification
  • The Rheem RTEX-18 Electric Tankless Water Heater is unrivaled in terms of both build quality and function, and it comes highly recommended.
  • It is made out of a long-lasting copper immersion, which aids in the rapid heating of the water when used.
  • Furthermore, the long-lasting shell protects it from damage caused by external sources and distinguishes it from the rest of its rivals in terms of appearance.

4. RINKMO Electric Tankless Water Heater

  • Picked by the staff The RINKMO Electric Tankless Water Heater never ceases to astound us with its exceptional performance and unrivaled features.
  • The device is popular among users since it provides them with unrestricted access to water throughout the whole day.
  • This, along with the cheap price range, makes it an excellent choice for individuals who cannot afford high-priced water heating systems.
  • Additionally, because of its remarkable design, it may be used for a variety of different tasks and purposes.
  1. Depending on your preferences, you may install it for point-of-use or for use across the entire house.
  2. Furthermore, it is simple to set up and does not want the assistance of a professional.
  3. Despite the fact that we had no prior knowledge, we were able to construct and install the entire equipment in about an hour.
  4. Additionally, another notable feature of the water heater is the additional protection it provides against leaking, which makes it particularly suitable for everyday use.
  5. To prevent short circuits and other catastrophes, the water lines and electric supply are also isolated from one another using insulating materials.


  • Lightweight
  • Adjustable temperature
  • Energy-friendly


  • Maintenance is required

The RINKMO Electric Tankless Water Heater is equipped with self-modulating technology, which regulates the amount of energy used. As a result, water is only heated when it is needed, resulting in less heat being lost. We strongly advise you to take this into consideration as a potential everyday usage choice. We guarantee that you will not be unhappy with your purchase.

5. Stiebel Eltron Tempra 36 Plus Tankless Heater

  • Tempra 36 Plus Tankless Heater, another outstanding product made by Stibel Eltron and packed with unrivaled features, is another remarkable product developed by Stibel Eltron.
  • This product, like its other rivals manufactured by the same firm, is similarly too expensive.
  • However, because of its amazing performance and remarkable safety features, it is well worth the investment.
  • In addition to providing a limitless supply of water throughout the day, the heater guarantees that there is no excessive energy usage.
  1. It is equipped with self-modulating technology, which allows it to regulate its energy output and only heat water when it is necessary to do.
  2. This has a significant impact on lowering energy use and, thus, on lowering heating costs.
  3. As a result, you will avoid overstretching your financial resources in the long run.
  4. A noise-controlling electrical switch is also included in the machine, which may be used to regulate the level of noise produced, particularly at night.


  • Copper-sheathed heating
  • 7-year leakage warranty
  • no need for venting
  • no maintenance required

With its elegant form and intelligent construction, the Stiebel Eltron Tempra 36 Plus Tankless Heater is renowned for its mobility and ability to be installed in confined spaces. Furthermore, because of its compact size, it reduces the need for ventilation while simultaneously increasing the overall output created by the system.

6. Rheem RTEX-24 Electric Tankless Water Heater

  • Selecting a Budget Designed to be a mid-priced product, the Rheem RTEX-24 Electric Tankless Water Heater may be utilized as an alternative to more expensive versions currently available on the market.
  • When it comes to this unit, the digital temperature display with dial control that allows you to change the water temperature is one of the most impressive things to have.
  • In addition to controlling the temperature, you can also adjust the water flow by pressing the button on the front panel of the unit.
  • Similarly, the heater’s long-term endurance may be due to its high-quality construction, which keeps it free of leaks over time and allows it to survive for much longer periods of time than you might imagine.
  1. The fact that the water and electricity compartments are separate is a huge plus for us.
  2. Because of this, the tool’s overall safety is enhanced, and the user is protected from accidently electrocuting oneself.
  3. In addition, it is distinguished by its ease of assembly and installation, which means that it requires little effort on the part of the end user to put it together.
  4. As a result, even if you lack prior expertise, you will not require the assistance of an expert for this goal.


  • Temperature controllable
  • noiseless
  • lightweight and transportable
  • and

As a result of its hassle-free controls and ability to provide fast heating applications, the Rheem RTEX-24 Electric Tankless Water Heater is highly recommended for whole-house use. Additionally, it is equipped with self-modulation technology, which regulates the energy intake and contributes to an energy efficiency of 99.98 percent.

7. RINKMO Residential Electric Tankless Water Heater

  • The RINKMO Residential Electric Tankless Water Heater is an excellent choice for individuals who are seeking for a tankless water heater that is both cost-effective and high in performance.
  • Despite its inexpensive price, it is equipped with a number of high-quality features that distinguish it from the rest of its competitors..
  • The fact that it is suitable for both on-point and whole house use demonstrates its versatility, which is appreciated by a wide range of consumers.
  • The intelligent modulation technology employed by the RINKMO guarantees that water is only heated when it is necessary, hence reducing total energy consumption to a significant degree.
  1. In addition to this, it lowers the cost of heating, so reducing the strain on your monthly financial situation.
  2. Additionally, the temperature control knobs allow you to alter the temperature settings, and they are quite simple to use.
  3. Like its competitors, this one uses insulating materials to isolate the electric wires from the water chambers, much like the competitors stated above.
  4. As a result, it provides an extra layer of protection against accidents and leaks.


  • Quick and convenient hot water supply
  • energy-efficient
  • lightweight and portable

Because of its ultra-quiet operation, the RINKMO Residential Electric Tankless Water Heater is suited for everyday usage. The system’s sophisticated noise-controlling technology, which is integrated into the design, significantly decreases noise output while allowing you to have limitless access to hot water throughout the day.

8. Eemax EEM24036 36 kW Electric Tankless Water Heater

  • Because of the chilly winters, many people are concerned about having cold water, but with the all-new Eemax EEM24036, you won’t have to worry about that anymore!
  • When it comes to the showers or the sinks, this water heater ensures that you have an unending supply of hot water available throughout the house at all times.
  • The fact that this water heater is energy efficient is its most appealing feature.
  • The water heater simply heats the water when it is required, and does not heat the water in an unnecessary manner.
  1. In reality, this machine regulates the amount of energy it puts into the heating process, ensuring that it consumes just the amount of energy necessary to heat a specific amount of water at a given time.
  2. Now, despite the fact that this heater is capable of meeting the needs of the entire household, what is remarkable is that its size is still quite small.
  3. Because of this, it is ideal for when you are attempting to squeeze such gadgets into smaller locations.
  4. Furthermore, its stainless blue blody has a clean appearance that may add to the elegance of your home’s interior design.


  • Saves energy
  • Compact design
  • Stainless steel body


  • Installation may be costly

It might be difficult to find a tankless water heater that can meet all of your requirements at the same time, but there is no doubt that this water heater checks off many of the boxes. This device not only provides continuous hot water whenever it is required, but it also ensures that you conserve water, energy, and space by reducing your water use.

Frequently Asked Questions

  • Is it necessary to vent electric tankless heaters?
  • No, electric tankless water heaters are built in a certain way that eliminates the necessity for venting to the outside environment.
  • As a result, they do not have any vents.
  • Gas tankless water heaters, on the other hand, require vents to allow the surplus gas trapped in the system to escape and prevent an explosion, which is especially important after prolonged use.
  1. Does it take a lot of effort to install an electric water heater?
  2. Electric water heaters, on the other hand, are user-friendly instruments that are significantly easier to construct and install than their gas-powered counterparts.
  3. However, you must exercise extreme caution during the installation procedure in order to avoid any unintended consequences.
  4. We urge that you carefully read and follow the user instructions, and that you contact the manufacturer if you have any questions.
  5. Are electric tankless water heaters a good investment in terms of energy efficiency?

Yes, electric water heaters are equipped with self-modulating technology, which is well-known for its capacity to regulate energy intake based on the amount of water being heated.Modern units are more energy efficient than their predecessors, and they may save up to 95 percent of the energy they consume.The finest entire home electric water tankless heater may also achieve an energy efficiency of up to 99.8 percent, which is exceptional.

Wrapping Up

  • Water heaters may be a tremendous benefit in times of need. Not only can they make your lives physically more comfortable, but they may also provide you with a great degree of mental peace by eliminating the need to deal with the terror of those dreaded early morning cold showers. Self-modulating technology, advanced temperature controls, copper-based heating chambers, and twin heating elements are all features found in some of the top whole house tankless water heaters. As a result of these characteristics, the following are our top three suggestions to all of the users out there. Self-modulation capabilities, a lifetime guarantee, customizable temperature settings, user-friendliness, and energy economy are some of the reasons why people choose the EcoSmart ECO 18 Electric Tankless Water Heater.
  • The Stiebel Eltron Tankless Water Heater is a good choice because of its numerous size possibilities, noise-free operation, adjustable temperature, wide temperature range, and cost-saving features.
  • Because of its greater safety, hassle-free installation, twin heating elements, lightweight design, full-house coverage, and minimal maintenance requirements, the Rheem RTEX-18 Electric Tankless Water Heater is a popular choice.
See also:  How To Clean Your Hot Water Heater?

Therefore, it comes highly recommended for those in search of the top whole home tankless water heater in the year 2020.

A Closer Look

How Do Whole-House Tankless Water Heaters Work?

  • A.
  • O.
  • Smith’s whole-house tankless water heaters provide hot water on demand and can help you save money on energy costs by lowering your household’s energy usage.
  • Both electric tankless and gas tankless whole-house water heaters are constructed using scale-reduction technology to provide great performance and efficiency while serving a wide range of applications.
  1. A tankless water heater for the entire house is designed to offer continuous hot water anytime you want it.
  2. When you turn on your hot water faucet, water from your cold water pipe enters the water heater and travels through the heat exchanger.
  3. When using an electric tankless device, the water travels over the heating components, swiftly heating the water to the temperature you want.
  4. A gas tankless water heater operates in the same way as an electric tankless water heater, except that instead of heating components driven by electricity, the burner is powered by natural gas or liquid propane.
  5. All A.

O.Smith tankless water heaters provide a continuous supply of hot water that may be provided to your house without difficulty.remove circle outline Are tankless water heaters more efficient than traditional tank water heaters?Tank and tankless whole-house water heaters each offer their own set of advantages and disadvantages.Tank-type water heaters have a cheaper initial cost and are frequently simpler to install when replacing a tank water heater of a comparable size and design.

However, despite the larger initial investment, tankless water heaters deliver continuous hot water on demand, take up less space, and consume less energy to run.add circle outline When it comes to electric tankless water heaters, what are the benefits and drawbacks to consider?The benefits of whole-house electric and gas tankless water heaters include the possibility for decreased energy use, a smaller footprint, and the ability to provide continuous hot water.Despite the fact that tankless water heaters may have a greater initial installation cost, Savings may be realized over time based on consumption, local energy costs, incoming groundwater temperature, and other considerations, amongst other things.What is the suggested maintenance procedure?

  • The majority of whole-house tankless systems will require yearly descaling of the unit; however, with A.
  • O.
  • Smith’s built-in anti-scale technology, which is available in certain models, the life of your water heater may be significantly increased.
  • The anti-scale technology aids in the modification of the chemical makeup of the scale, allowing it to move through the heat exchanger without adhering to the walls and negatively compromising the operation of the water heating system.

add circle outline How long does a tankless water heater have a life expectancy?A.O.Smith is a fictional character created by American author A.O.Smith.

  • Gas tankless versions are covered by a 15-year limited warranty, while electric tankless units are covered by a 5-year limited guarantee.
  • When properly maintained, a tankless water heater may last up to 20 years for gas tankless models and 10 years for electric tankless models.
  • add circle outline Is it true that you save money by using a tankless water heater?
  • Tankless water heaters save you money on energy since they only heat the water when it is actually needed, rather than continually heating the tank when it is not in use.

add circle outline Do you think a tankless water heater will increase the value of your home?Because of the increasing popularity of tankless technology, including a tankless water heater in a home can significantly increase its attractiveness to potential buyers.add circle outline What factors should I bring up with my contractor before making the decision to purchase a tankless water heater?What is the approximate cost of installing a tankless hot water heater?

Depending on your home’s present plumbing system, the cost of installation might vary significantly.A.O.Smith suggests that you begin the assessment process by calling a qualified general contractor.When it comes to tankless water heaters, what size do I need for my home?

  1. The water supply you require, the climate in your home, and the present plumbing will all be evaluated by a professional contractor, who will then be able to make an accurate suggestion for your property.
  2. The XPERTTM Product Selector can help you obtain a general idea of which water heater would be the best fit for your house.
  3. What is the best location to install a tankless water heater?
  4. Electric tankless water heaters may be put in any position in your home as long as the necessary connections are in place.
  5. Their small footprint allows you to free up important floor space in your house.
  6. Tankless water heaters that run on natural gas will require special ventilation, which will limit the locations where they may be installed around your home.

What is the best way to vent a tankless water heater?When using A.O.Smith whole-house electric tankless water heaters, there is no need for venting; however, when using A.

O.Smith gas tankless water heaters, you should speak with your local plumbing professional to identify the most appropriate venting for your property.add circle outline What is the most efficient tankless water heater for a complete house?The one that is tailored to your exact hot water requirements!Discuss with your installer about the precise energy alternatives available to you (natural gas, liquid propane or electric), your use demands, and your venting requirements in order to establish which option best suits your requirements.

Benefits of Tankless Water Heaters

Continuous Hot Water

Tankless water heaters provide a continuous supply of warm water. If your hot water heater is appropriately sized, you will never run out of hot water again.

Energy Savings

Depending on how much hot water you use, A. O. Smith tankless water heaters only heat the water when it is needed, lowering your energy expenses and saving you money.

Space Savings

Tankless water heaters, in comparison to standard water heaters, take up substantially less space and may be installed in a variety of locations within your house.

On-Demand Hot Water

On-demand hot water is provided by the heating technology found in A. O. Smith tankless electric water heaters, which heats the water just when you need it.

Instant Hot Water

Tankless water heaters by A. O. Smith with built-in recirculation pumps provide immediate hot water when properly fitted with the appropriate pipework.

Innovation & Reliability

A. O. Smith has a long and illustrious history of dependability and innovation that has propelled the company to the forefront of the water heating market for decades.

Tankless vs. Tank

Investigate the advantages associated with each kind of water heater in further detail.

Tankless Water Heater

  • Continuous hot water
  • energy efficiency
  • space savings
  • and environmental friendliness are all advantages.

Tank Water Heater

  • Low initial investment
  • choices that are energy efficient
  • Installation is simple.
  • Large selection of tank sizes ranging from 30 to 95 gallons
  • hot water storage on-site

Gas TanklessWater Heater

Check out the reviews Read on to find out more about A. O. Smith gas tankless water heaters and whether they are a good fit for your house.

Electric TanklessWater Heaters

Check out the reviews Read on to find out more about A. O. Smith electric tankless water heaters and whether they are a good fit for your household.

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Contractor Resources

  • Detailed Instructions for Setup Installing a gas tankless water heater is simple when you follow our installation instructions. See the document
  • Guide to Obtaining Resources Match the flow rate to the requirements of your customers. See the document
  • Cross-Reference Tool is an acronym that stands for Cross-Reference Tool. Look for replacement products that are NAECA-compliant. Make use of a tool.

The Best Electric Tankless Water Heaters of 2022

  • If you purchase a product after clicking on one of our affiliate links, BobVila.com and its partners may get a commission.
  • Image courtesy of Amazon.com Despite the fact that standard water heaters are still the preferred option for some, tankless ones save space and can help you save money on your heating cost.
  • If you’re thinking about going tankless, the first decision you’ll have to make is whether to go with a gas or electric type (you can read up on the merits and drawbacks of both in more detail here).
  • While high-end gas versions are more powerful than electric models, they are also significantly more costly and more difficult to install than electric models.
  1. In addition, gas tankless water heaters are often less efficient than their electric equivalents in terms of heating capacity.
  2. Continue reading for step-by-step instructions on how to choose the finest electric tankless water heater for your house.
  1. THE BEST OVERALL: Stiebel Eltron Tankless Electric Water Heater
  2. THE RUNNER UP: Rheem Electric Tankless Water Heater
  3. THE BEST FOR SMALLER HOMES: EcoSmart ECO 11 Electric Tankless Water Heater
  4. THE BEST FOR LARGER HOMES: EcoSmart ECO 27 Electric Tankless Water Heater
  5. MOST VERSATILE: Stiebel Eltron DHC-E12 Tankless Electric Water Heater

Photo: amazon.com

What to Consider When Choosing the Best Electric Tankless Water Heater

When looking for the finest tankless water heater, the process entails more than simply deciding whether or not the unit will heat enough water to meet your need for hot water. Several important considerations are discussed in the following section, all of which are likely to have an influence on your decision while you shop.


Electric tankless water heaters are generally classified into two categories: entire house and point of use (often referred to as POU or single point).The most easy and least expensive option when contemplating replacing a standard hot water tank with an energy-saving electric tankless type is to go with a whole-house system that does not require any new plumbing.Point-of-use heaters may be a more cost-effective solution in newly constructed houses or in situations where guest accommodations have been installed.

Because water is heated closer to the point of use, even if the initial expenses are slightly greater, less energy is lost because unused water does not get cold while sitting in lengthy lengths of pipe.There is no one-size-fits-all approach, however, and each installation must be evaluated on its own merits and limitations.Because these gadgets are meant to be permanently connected, they are difficult to transport, especially when used in recreational vehicles.If a plug-in electric water heater is required, an electric mini-tank type is likely to be the most cost-effective solution.

Flow Rate (GPM)

When it comes to picking an electric tankless water heater, the volume of hot water that the device can supply is the most crucial consideration.It is specified in gallons per minute how much water is flowing (GPM).A shower or a washing machine, for example, use around 2 GPM of water.

It is theoretically possible to determine the size of the water heater required by putting up the entire number of showers, baths, washing machines, and other such appliances in a home.However, because these nearly never all run at the same time, the effect is an overestimation of the total number of events.Rather, some assumptions are made, such as: In general, a one- or two-bath home requires around 5 GPM.A 10 GPM unit would be required for a big home with three or four bathrooms.

Because the flow rate is influenced by the temperature of the supply water, the same model installed in the Southern United States would deliver a higher flow rate than the same model installed in the Northern United States.Aside from that, when it comes to electric tankless water heaters in particular, GPM is sometimes seen as a secondary consideration to power (measured in kilowatts—kW).This graph shows both the amount of energy consumed and the amount of heat produced.Potential purchasers may find all of this to be quite perplexing.

However, manufacturers often give great recommendations on the appropriateness of their heaters for various levels of hot water usage.Aside from that, they typically specify the temperature range that may be achieved.If you want more assistance, it is recommended that you connect with a certified plumber or heating specialist.

Efficiency Rating

One of the most significant advantages of tankless water heaters is their efficiency.They only heat water when it is required, resulting in very little energy being wasted and hence cheaper electricity bills.Generally speaking, electric tankless water heaters are more energy efficient than their gas equivalents; nevertheless, obtaining precise ratings is a difficulty.

The Uniform Energy Factor (UEF) rating of gas models is typically quoted, which is a standard set by the United States Department of Energy.Unfortunately, producers of electric vehicles are less likely to adopt this approach.Some people still rely on the Energy Factor rating that existed before UEF, however this is no longer regarded precise enough.The fact that each manufacturer may employ a different set of criteria for testing means that this is not the most accurate approach to make comparisons.

There is no allegation that they are deceptive.Having said that, it is more common to use a % efficiency figure.When it comes to gas models, their efficiency ranges from 80 percent to as high as 93 percent, while electric versions are sometimes 98 or 99 percent efficient.This is beneficial for the environment as well as for cutting family expenses.

Additional Features

When it comes to electric tankless water heaters, there is rarely a problem with their physical dimensions.Because water pipes and electrical conduits are often tiny in diameter, units are frequently compact and unexpectedly slim in appearance.Having stated that, when implementing point-of-use models, it is possible that the dimensions will be critical.

The majority of them are incredibly quiet and do not produce the firing noise typical with gas-powered machines.Some claim to be entirely deafeningly quiet.These gadgets are almost always equipped with some type of digital display.The controls and information given, on the other hand, differ significantly.

Basic versions may just include up and down arrows to increase or decrease power, as well as a thermometer display that shows the current temperature.Others can save preset temperatures in memory, give adjustable flow control to cut power use, or monitor and report on energy savings, among other features.

Installation and Maintenance

  • Because there is no need for venting, electric tankless water heaters are far less complicated to install than gas counterparts. It is possible to place them almost wherever that electricity and water can be given since the devices are more compact and do not require significant air gaps around them. However, although tiny and point-of-use versions may easily be powered by a 120-volt supply, bigger and more powerful units require 240-volts and typically two or three circuit breakers to function properly. DIYers with a solid grasp of domestic electrical systems will be able to complete the necessary work on their own
  • no specialized tools will be required in this case. In any other case, the assistance of a specialist should be sought. Despite the fact that these gadgets are typically trouble-free, a tiny bit of regular maintenance will keep them functioning at top efficiency and increase their working life significantly. Manufacturers typically give detailed instructions, but in essence, there are just two actions that need to be accomplished. The majority of types are equipped with a screen filter that prevents dirt particles from accessing the heater. If there is an obstruction, it should be checked and cleaned if required
  • the system should be flushed to prevent the accumulation of chemical deposits that diminish efficiency and might eventually prohibit the unit from functioning. This is especially significant in locations with hard water. In essence, water and electricity must be turned off, and a tiny pump must be used to push white vinegar into the heater in order to clean it properly. For this purpose, commercial flushing kits are available on the market.
See also:  How Long Does It Take A 50 Gallon Electric Water Heater To Heat Up?

Our Top Picks

  • The following selections are from a number of prominent manufacturers and have been grouped into several categories to make it easier to discover the finest electric tankless water heater for a certain case. Please note that the following selections are not intended to be comprehensive. Image courtesy of Amazon.com One of the most powerful electric tankless water heaters now available, the Stiebel Eltron unit is capable of delivering up to 7.4 GPM, which should be adequate to supply enough water for four showers to run at the same time in a single room. It has the capability of heating water to 140 degrees Fahrenheit, which is significantly higher than the 110 degrees Fahrenheit recommended maximum temperature for domestic water by the United States Department of Energy (DOE). It’s also a really effective method. Given the fact that no system is ever 100 percent flawless, the Stiebel Eltron’s efficiency rating of 99 percent places it within the top tier of systems available. Auto-modulation reduces changes in water temperature to a bare minimum and operates almost completely quietly. It is possible to program a preferred temperature into memory. It is necessary to have a 240V power supply and three 50 amp breakers for this 36 kW type. Features 99 percent efficiency
  • heats to 140 degrees Fahrenheit
  • preferred temperatures may be programmed
  • maximum flow rate of 7.5 GPM
  • durable construction

  • Requires 240-volt supply and three 50A breakers
  • Image courtesy of Amazon.com Rheem offers a wealth of knowledge and expertise in tankless water heaters, both gas and electric. With a capacity of up to 4.4 GPM and superior self-modulation, this high-quality product achieves an efficiency rating of 99.8 percent while maintaining a high level of performance. It has the ability to elevate water temperature for one or two showers well over the permitted range of 110 degrees Fahrenheit, making it an amazing but cost-effective option for small houses. The controls are easy to use, with to a wide dial and a clear display that allows for adjustment in single-degree increments. Heating elements with a brass finish have a long life expectancy and are simple to replace if the need ever arises. This particular Rheem type is an 18kW machine that requires a 240V power source as well as two 40A breakers. AdvantagesCan be used for a single point of usage or several applications.
  • Digital temperature control
  • 4.4 GPM flow rate
  • 99.8 percent energy efficiency rating

  • Requires 240-volt supply and two 40A breakers
  • Image courtesy of Amazon.com It is recommended that those who live in compact modern homes examine the EcoSmart ECO 11 in further detail. Designed to deliver a maximum flow rate of 3.1 GPM, this low-cost device can simultaneously offer consistent hot water for a shower and a low-flow faucet. One of the few electric tankless water heaters that adheres to the precise UEF standard, with an amazing efficiency of 99.8 percent, this model stands out from the crowd. The ECO 11 is equipped with self-modulating technology, much like the rest of the EcoSmart lineup. The Department of Energy estimates that it saves around 50 percent on hot water bills every year. Temperature may be adjusted in 1-degree increments anywhere between 80 and 140 degrees Fahrenheit using a digital temperature control. In order to operate, the EcoSmart ECO 11 must be connected to a 220V circuit with one 60A circuit breaker. Advantages: 99.8 percent efficiency
  • The flow rate is 3.1 GPM
  • digital temperature control is included.

  • Requires 220-volt supply and 60A breaker
  • Photo courtesy of amazon.com With a maximum flow rate of 6.5 GPM, this bigger EcoSmart device provides comparable performance. It also features a low activation need of 0.3 GPM, which means you won’t have to turn on your faucets at full power in order to obtain enough hot water. The use of flow modulation, as is common in many leading devices, allows EcoSmart to give ideal control. Less responsive units would waste water and power required for heating, but this one provides optimal control. In this way, maximum energy saving is achieved while also assuring that fluctuations in supply temperature or pressure have no effect on hot water production. The EcoSmart ECO27 has a maximum operating temperature of 140 degrees Fahrenheit and has an energy efficiency of 99.8 percent.It operates at 27 kW and requires a 240V power source and three 40A breakers.Pros99.9 percent efficient
  • The temperature may reach 140 degrees Fahrenheit at its highest point.
  • Designed to deliver 6.5 GPM
  • The smallest amount of activation is 0.3 GPM.

  • Requires 240-volt supply and three 40A breakers
  • Image courtesy of Amazon.com It is possible to utilize this Stiebel Eltron unit for single or multipoint installations due to its maximum flow rate of around 2 GPM. While it’s most commonly used for sinks, it’s also capable of producing hot water for a low-flow shower if necessary. It’s an excellent alternative for remodeling projects, and it’s also suitable for permanent installation in boats and recreational vehicles. In addition to business locations such as offices, warehouses, and gas station restrooms, it is particularly popular because of its recognized dependability and durability (it is capable of withstanding seismic activity). The Stiebel Eltron has a 99 percent efficiency rating, which is exceptional. It makes use of microprocessors for improved flow management, which allows it to maintain a steady temperature in the range of 86 degrees to 140 degrees F. It requires a 240V power source and a single 50A circuit breaker. Advantages: 99 percent effective
  • A maximum flow rate of 2 GPM is permitted.
  • Sinks, low-flow showers, yachts, and recreational vehicles are typical applications.
  • The temperature ranges from 86 and 140 degrees Fahrenheit.

  • Requires 240-volt supply and 50A breaker
  • Image courtesy of Amazon.com Most electric tankless water heaters are small, space-saving appliances, but the ECOTOUCH is so small that it can fit almost anyplace. Its dimensions are 11 by 7.5 by 2.35 inches, making it ideal for tight spaces. Despite the small size, you can receive up to 1.5 GPM and an efficiency rating of 98 percent from this unit. It has the capability of continuously supplying hot water up to 116 degrees Fahrenheit. A fire-retardant casing and tempered glass front panel make it suitable for commercial usage, as does the tempered glass screen. This device has temperature stability built in by self-modulation, as well as protective circuits against overload, overheating, and leaking. When installed at any angle, the unit will perform flawlessly on a moving boat, for example.. The ECOTOUCH requires a 240V power source and a single 30A circuit breaker to operate. Advantages: 98 percent efficiency
  • The casing is fire-resistant, and its dimensions are 7.5 inches by 2.35 inches. It has protection circuits for overvoltage, overheating, and leakage.

  • Requires 240-volt supply and 30A breaker
  • Image courtesy of Amazon.com Extra bathrooms or guest houses where expanding an existing tank system would be prohibitively expensive or impossible are good applications for electric tankless water heaters. In these circumstances, the Titan’s small size makes it a great alternative. It is reasonably priced, and it has a maximum production capacity of 4 Gallons per minute. It has a 99.5 percent efficiency rating, which is excellent. Installation is straightforward, and control is accomplished with simple up-and-down arrows. However, because it requires a minimum input temperature of 65 degrees Fahrenheit, it is less than optimal for use in cold climates, as previously stated. The 11.8 kW Titan requires a 220V power source as well as a single 60A circuit breaker. Advantages: 99.5 percent efficient
  • ideal for single-point application
  • provides 4 GPM
  • low cost.
  • Cons It is necessary to have an input temperature of 65 degrees.
  • A 220V power source and a 60A circuit breaker are required.

Our Verdict

While the use of an electric tankless water heater might vary depending on the scenario, the Stiebel Eltron Tankless Water Heater is our top option for the majority of home applications.The Stiebel Eltron DHC-E12 Tankless Electric Water Heater is an excellent choice for individuals seeking for a tankless water heater that can be utilized in an RV or boat since it has the added versatility to meet such applications.

How We Chose the Best Electric Tankless Water Heaters

Because both whole-house and single-point-of-use situations are common when installing a tankless water heater in a home, our suggestions for the best electric tankless water heater include alternatives that are capable of accommodating both scenarios.We reduced our area of study to include models with outstanding reputations for longevity and ease of installation, and we took into account factors such as flow rate, efficiency rating, maintenance needs, and other characteristics like as the unit’s size and sound levels.While electric tankless water heaters are well-known for being less expensive and easier to install than their gas counterparts, our favorite models are also more efficient and deliver the necessary power for their applications, whether they’re used for whole-house hot water, low-flow showers, or in recreational vehicles.

Please keep in mind that each model requires a 220-volt power supply with a different set of breakers depending on the model you are purchasing.


After reading through the information on critical factors and analyzing the top options, you will no doubt be in a better position to determine which electric tankless water heater is the best fit for your needs and requirements.. However, there may still be some unanswered questions. The next section contains answers to several of the frequently asked questions.

Q. How does a tankless water heater work?

After going through the information on critical factors and looking over the top options, you should be in a better position to determine which electric tankless water heater is the best fit for your needs. Some queries, on the other hand, may still be unanswered A number of frequently asked questions are addressed in the next section.

Q. Do electric tankless water heaters need to be vented?

No. In contrast to comparable gas models, there is no carbon monoxide produced as a byproduct. Overall, electric tankless water heaters are far easier to install than traditional tank water heaters.

Q. Can you still shower if your water heater is leaking?

Yes, you are still permitted to shower.However, in order to avoid water damage, the leak must be attended to by a professional as soon as possible.A water heater with a conventional tank has the potential to spill catastrophically, causing severe injury or death.

In spite of the fact that an electric tankless water heater does not have a tank to retain water, faulty parts can still create tiny leaks, which can cause significant water damage.

Q. What are the signs your hot water heater is going out?

Water that is contaminated, particularly if it contains rust particles, is a definite symptom of interior deterioration. Other signs include inconsistency in performance and a lack of reactivity to changes in temperature.

Q. How do you flush an electric tankless water heater?

The procedure often entails cutting off the water and electricity supplies, removing the heating element, filling the interior chambers with white vinegar, and then cleansing the system again. Manufacturers often give instructions that are tailored to each model.

Q. How long do electric tankless water heaters last?

A usable life of 20 years or more can be anticipated, according to the United States Department of Energy.

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