6 Best Electric Tankless Water Heaters – (Reviews & Guide 2020)

In recent years, on-demand water heaters have been gaining a lot of prominences. Electric tankless models seem to be at the forefront of the charge due to the unique technology they use. It allows them to instantly heat up the cold water and give you hot water all in a matter of seconds. Apart from being incredibly effective, electric tankless water heaters are also efficient, while allowing you to save money on gas. Doesn’t that sound like what you’ve been looking for? It definitely does.

However, due to the recent surge in the popularity of these devices, different manufacturers have been churning out different models. Which has consequently made choosing the right unit a daunting task for buyers. We are aware of the different challenges buyers face when shopping for the best electric tankless water heater for their homes. And that is why we have put together these electric tankless water heater reviews to help make things much easier. You will find that we’ve investigated these electric tankless water heaters in two sections; whole house and point of use.

  • 4.5 Customer Rating
  • Stiebel Eltron Tempra 24 Plus Electric Tankless Water Heater
  • PRICE $$$$
  • Dimensions: 4.62 x 16.62 x 14.5"
  • Weight : 16 lb.
  • Max Flow Rate: 4.68 GPM
  • Warranty : 7 Years
  • 4.5 Customer Rating
  • Eccotemp ET-32 Residential Electric Tankless Water Heater
  • PRICE $$$
  • Dimensions: 15.5 x 15.5 x 6.25""
  • Weight : 23 lb.
  • Max Flow Rate: 4 GPM
  • Warranty : 10 Years
  • 4.1 Customer Rating
  • Ecosmart ECO 27 Electric Tankless Water Heater
  • PRICE $$
  • Dimensions : 17 x 17 x3.75"
  • Weight : 13,75 lb.
  • Max Flow Rate : 5.3 GPM
  • Warranty : Lifetime
  • 4.9 Customer Rating
  • Rheem Rtex-24 Residential Electric Tankless Water Heater
  • PRICE $$$
  • Dimensions : 19 x 17.63 x 4"
  • Weight : 17.8 lb.
  • Max Flow Rate : 5.9 GPM
  • Warranty : 5 Years
  • 3.2 Customer Rating
  • Thermoflow Elex 24 Electric Tankless Water Heater
  • PRICE $$
  • Dimensions : 18.6 x 10 x 4.5"
  • Weight : 8.4 lb.
  • Max Flow Rate : 3 GPM
  • Warranty : 5 Years
  • 4.1 Customer Rating
  • Marey ECO150 Electric Tankless Water Heater
  • PRICE $$
  • Dimensions : 14,2 x 8.7 x 3.5"
  • Weight : 10,1 lb.
  • Max Flow Rate : 3,5 GPM
  • Warranty : 5 Years

Best Whole House Electric Tankless Water Heaters

1. Stiebel Eltron 24 Plus Tempra Whole House Tankless Water Heater

Stiebel Eltron 24 Plus Tempra Whole House Tankless Water HeaterThe Stiebel Eltron 24 plus Tempra is an impressive water heater that is fitted with numerous features. These contribute to its numerous pros to the user. It is a 4.6 x 16.6 x 14.5 inches’ device that weighs 20.5 pounds. This shows that it consists of a compact design and it is readily portable. You can, therefore, mount it on a wall and consequently save on space.

The German manufacturer ensured that it utilized the unique microprocessor technology. Which gives the user total control over the temperature levels. You are therefore able to get a maximum of 5.5 gallons of water per minute which is ideal for your household use.

It is easy to install and use this device as it comes with a detailed user manual from the manufacturer. It lacks mechanical switches which ensure that throughout its operation its silent. This makes it the best option especially when the noise of your key concern. This unit is made up of steel and will hence last a long time giving you splendid performances. A major disadvantage is that it will require a high source of power which might lack in some homes. However, this can be dealt with efficiently, making the Stiebel Eltron water heater a beast in the market.

For more detail, see our full review of Stiebel Eltron 24 Plus

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2. Eccotemp ET-32 Residential Electric Tankless Water Heater

Eccotemp-ET-32-Residential-Electric-Tankless-Water-HeaterThe Eccotemp ET-32 Residential Electric Tankless Water Heater is a unique device from Eccotemp. It has a compact size as it measures 6.2 x 15.5 x 15.5 inches and weighs 23 pounds. This makes it ideal for either indoor or outdoor use as it is greatly portable. Its size also saves on space enabling alternative use. The performance of this tool is unmatched as it gladly offers you 4 GPM. This is quite high and will meet all your hot water obligations whether in the office, salon or home.

The ET-32 is the most advanced in the ET-series, and hence it is highly efficient. The manufacturer was keen on the quality of the product. It will serve you for the longest time without breaking down. In this, copper and other corrosion resistant materials were used. A self-diagnostics system is also present. This will ensure that you quickly turn the device off in case of a leak. Considering that this device also comes with a 5-year limited warranty, it is a worthy purchase.

For more detail, see our full review of Eccotemp ET-32

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3. EcoSmart ECO 27 Whole House Electric Tankless Water Heater

EcoSmart-ECO-27-Eelectric-Tankless-Hater-HeaterThe EcoSmart ECO 27 Electric Tankless Water Heater is a unique device from EcoSmart that is fitted with numerous modern features. These include the patented self-modulating technology which uniquely boots the performance of the device with respect to energy savings. This 16.8-pound device gives a stunning performance of 3 GPM will ensure that all your water needs are met fully. It is also highly efficient and environmental-friendly at the same time. The installation and maintenance of this tool is simple which makes it ideal for all age groups.

This device is also highly flexible as it will suit even the coldest areas in the world. Luckily, the manufacturer included a map that shows different regions and how the device performs. A lifetime warranty is also included. Be aware of the policies that come with the warranty so that you get the most out of it. Overall, this product is unmatched and will be the best pick for your water heating purposes.

For more detail, see our full review of EcoSmart ECO 27

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4. Rheem RTEX-24 Residential Electric Tankless Water Heater

Rheem-RTEX-24-Residential-Electric-Tankless-Water-HeaterRheem is a household name in the business, and there is no disappointment with the RTEX-24. With the minimalistic appearance and user-friendly design, this electric tankless water heater produces a powerful flow of hot water. It also ensures a remarkable energy efficiency of 94 percent.

This unit is a very energy-efficient model and it is strictly made for home use. Sporting a simple design and easy and quick installation, it doesn’t take up a lot of space. Moreover, it is constructed using premium-quality materials for reliability, longevity, and efficiency.

It features a durable copper immersion-heating element, user-friendly digital temperature display, and reliable 3 / 4-inch NPT water connections. Engineered to provide several years of use, it has several internal features, making this a complete, self-modulating model.

Rheem provides a convenient sizing tool to enable you to find the ideal unit for your household and geographic area needs. You can expect this device to deliver 4.0 GPM at a 46-degree rise, which makes it a very powerful unit.

Nothing is ever made without flaws, and this unit is not exempted. There’ve been numerous complaints from customers about leaks and poor customer service. Otherwise, this is a great product that won’t likely give you regrets.

For more detail, see our full review of Rheem RTEX-24

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5. Thermoflow Elex 24 Electric Tankless Water Heater

Thermoflow-Elex-24-Electric-Tankless-Water-HeaterWhen looking for an alternative to your water heater, the Thermoflex Eflex24 Tankless Water Heater is an eco-friendly choice. This 8.4 lbs tankless water heater is a sleek, modern addition to your home. It can accommodate your hot tub or jacuzzi or even be placed to handle a dishwasher, sink and shower simultaneously. With no venting required, this tankless water heater is environmentally friendly. It can save up to 50% in water heating cost and up to 85% less energy than a conventional water heater tank.

The Thermoflex has a maximum flow rate of 3 gallons per minute with an activation flow of 0.6. Selecting a Thermoflex Tankless Water Heater means more than just decentralizing hot water, which lowers the CO2 emission. But also, it is more hygienic. With a tankless water heater, there is no need for the Legionella bacteria test. Due to the fact that there is no water left sitting in a tank. Overall, the Eflex24 is an energy saving, sleek water heater that will be a smart addition to your home.

For more detail, see our full review of Thermoflow Elex 24

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6. Marey ECO150 Residential Electric Tankless Water Heater

Marey-ECO150-Electric-Tankless-Water-HeaterThe Marey ECO150 Tankless Water Heater is a mid-range unit that is suitable for residential applications as well as small commercial uses. With its compact construction, and easy installation, it is a great choice. It’s soft-touch control panel and an LCD display help its popularity to rise.

The unit has 2 buttons to increase and decrease the water temperature according to your needs. You can also choose between showing the temperature in Celsius and Fahrenheit, which shows how user-friendly this device is. Furthermore, the Marey ECO150 Water Heater is equipped with a Nichrome heating element with a stainless steel water channel. Each of these components has high resistance and prevents corrosion caused by chlorine and calcium, often seen in water sources.

This ECO150 model is perfect for supplying hot water at two places at the same time. Surprisingly, without any sort of fluctuation in the water temperature. The Flow switch activation mechanism makes sure that the water heater needs very little pressure to get its job done. In case of possible installation issues, Marey’s customer service team is one of the best. They will provide you with prompt solutions.

For more detail, see our full review of Marey ECO150

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  • 4.5 Customer Rating
  • Eemax EEM24018 POU Electric Tankless Water Heater
  • PRICE $$
  • Dimensions: 17 x 14 x 3.8"
  • Weight : 14.5 lb.
  • Max Flow Rate: 3.5 GPM
  • Warranty : 5 Years
  • 4.1 Customer Rating
  • Ecosmart ECO 11 Electric Tankless Water Heater
  • PRICE $$
  • Dimensions : 11,5 x 8 x 3,75"
  • Weight : 6,5 lb.
  • Max Flow Rate : 3,2 GPM
  • Warranty : Lifetime
  • 3.2 Customer Rating
  • Sio Green IR30 POU Electric Tankless Water Heater
  • PRICE $$
  • Dimensions : 13.5 x 8.5 x 3"
  • Weight : 6.4 lb.
  • Max Flow Rate : 0.5 GPM
  • Warranty : 2 Years
  • 3.9 Customer Rating
  • Sio Green SIO14 Electric Tankless Water Heater
  • PRICE $$$
  • Dimensions : 20 x 14 x 6"
  • Weight : 26,9 lb.
  • Max Flow Rate : 4.4 GPM
  • Warranty : 3 Years
  • 3.2 Customer Rating
  • Bosch Tronic 3000 Electric Tankless Water Heater
  • PRICE $
  • Dimensions : 12,75 x 6,5 x 3"
  • Weight : 5 lb.
  • Max Flow Rate : 1,8 GPM
  • Warranty : 5 Years

Best Point of Use Tankless Water Heaters

1. Eemax EEM24018 Electric Tankless Water Heater

Eemax-EEM24018-Electric-Tankless-Water-HeaterThere are so many options for water heaters. You can go with the traditional water heater tank, which will always maintain a certain amount of hot water. If concerned with saving energy and space, you can go with a tankless water heater. The tankless water heater can supply to an entire home. Hence, allowing you to run showers, sinks, and dishwashers at the same time. Or there are several times where a smaller water heater would serve you better.

For a more compact, tankless water heater, the Eemax brand has created a self-modulating tankless water heater. One that provides an endless supply of hot water. The Eemax is a 14.5 lbs, 240-volt tankless water heater that allows you to run your shower. And even more, still receive hot water to an additional sink, or two. With its self-modulating technology, you can manually adjust your temperature on its digital display. The installation is easy to follow, just keep in mind, there may be a need for additional wires purchased. If you are looking for a compact water heater, the Eemax is user-friendly. Above all, it can provide an endless flow of hot water.

For more detail, see our full review of Eemax EEM24018

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2. EcoSmart ECO 11 Electric Tankless Water Heater

EcoSmart-ECO-11-Electric-Tankless-Water-Heater-The water heater industry has been revolutionized by EcoSmart’s line of electric tankless water heaters. They help you save space, conserve energy and save money. The EcoSmart ECO 11 model is equipped with a patented self-modulating technology. Which makes it one of the most energy-efficient models around. The self-modulating technology allows the unit to adjust the amount of energy consumed depending on the water flow.

Furthermore, this model sports a stylish design, making it a good fit for the interior of your home. The incorporated digital temperature control allows pinpoint control to dial in your ideal shower temperature. In addition to that, it has an activation flow of 0.30 GPM, which is quite impressive. Besides, it is engineered to heat up 2 gallons per minute and is optimum for 67° F and above.

The EcoSmart ECO 11 needs a 240 single-phase electrical connection, which enables it to draw 57 amps at optimum use. Therefore, you will require a circuit breaker of 60 amp. The only drawback of this device is that it may not perform well in the northern United States like Idaho, North Dakota, and Montana.

For more detail, see our full review of EcoSmart ECO 11

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3. Sio Green IR30 POU Electric Tankless Water Heater

Sio-Green-IR30-POU-Electric-Tankless-Water-HeaterSearching for an alternative to your traditional water heater can be a hard task. Your search will show so many different brands and options with many offering the same benefits. Overall, a tankless water heater provides an energy efficient way to consistently receive hot water. Sio Green has created a water heater that is not only tankless but also advanced.

Sio Green uses quartz material within their heating tubes in replacement of metallic coils. This compact tankless water heater can go in several places within your home. It works well with larger water heaters that may be located too far from your kitchen or bathroom sink.

Other features of the Sio Green tankless water heater is that the temperature is easy to read and control. Having four power levels gives some range to set the water to best fit your needs. The 2-year warranty enables you to enjoy this tankless water heater without worrying about malfunctions. The advanced technology on the Sio Green makes it the best choice for a compact, tankless water heater.

For more detail, see our full review of Sio Green IR30 POU

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4. Sio Green SIO14 Electric Tankless Water Heater

Sio-Green-SIO14-Electric-Tankless-Water-HeaterSioGreen is another leading brand in the industry and their SIO14 is another top-of-the-line unit made for commercial and residential applications. It is suitable for homes and also small to medium commercial centers with a hot water demand of up to 4.4 gallons per minute. Being a powerful water heater, this unit utilizes Quarts infrared heating elements to heat up water, for a high-efficiency performance.

Simply put, this unit will continuously supply hot water wherever and whenever you need it, whilst being extremely energy efficient. In cold regions, it produces about 3 gallons per minute in minimum temperature, which is quite low. With this, it will only be able to support only one sink at a time without a shower. However, it can support one sink and one bathroom at the same time in warm regions.

It is equipped with patented technology, which allows it to create heat without having direct contact with metals. Weighing 82 pounds, this unit is fairly on the heavier side, which some people find inconvenient.

For more detail, see our full review of Sio Green SIO14

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5. Bosch Tronic 3000 Electric Tankless Water Heater

Bosch-Tronic-3000-Electric-Tankless-Water-HeaterThe Bosch Electric Tronic 3000 Electric Water Heater is another decent option on our list. It comes with several features aimed towards making life easier for homeowners, which explains why it’s such a popular choice. The unit features a sleek and compact design. It enables you to install it independently as a pair with the whole home sink system or under your sink.

At 98 percent, this product performs really efficiently Simply put, operating it requires only a little electricity. With its power ranging from 3.2 to 12 KW, it can be adjusted depending on the incoming water temperatures and your needs, while saving on your utility bills. The unit features a durable build which incorporates glass linings to avoid leaks or damage. This allows the device to be able to stand long-term use and resist impact.

The water flow rates of other models in the 3000 series are around 0.5 to 1GPM. The US12 has a 1.8 GPM flow rate which is cool when its small size is taken into account. Interestingly, this model is also equipped with thermostatic control. Which enables you to automatically adjust the temperature of the water to your desired choice.

For more detail, see our full review of Bosch Tronic 3000

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What is an Electric Tankless Water Heater?

An electric instant water heater is an energy-efficient device that supplies you with endless hot water. Furthermore, it also allows you to save on gas. These devices, rather than holding water in a tank like the conventional tank-style models, heat the water whenever and wherever it is required. With an electric tankless water heater, there is an unlimited supply of hot water to faucets, showers, and hot water machines such as washing machines and dishwashers.

Electric Tankless Hot Water Heater Buying Guide

From a lot of perspectives, electric instant water heaters are greatly undervalued in the realm of on-demand heated water. While they offer numerous benefits over their gas-fueled counterparts, they don’t often receive the credit they actually merit. Of course, they aren’t without their inadequacies, but their super energy economy and versatility make them really difficult to disregard.

If you are considering buying a tankless water heater, you need to look closely at electric tankless water heaters. Whether you are in search of a point-of-use unit or a whole-house system, there are several benefits that make these appliances an excellent option. If you are interested in the best electric tankless water heaters, this article aims to serve as a buying guide to guide prospective buyers.

The Top 6 Things to Consider When Buying an Electric Instant Water Heater

electric-tankless-water-heater-reviewsNow you might be intending to purchase an electric tankless water heater due to the different benefits they offer. While there is actually a wide range of great options to choose from, you need to check a couple of important factors if you really want to buy the best model.

  1. Energy Efficiency

    Since you’ll be powering the unit with electricity, you will certainly want an energy-efficient model. It’s because of this you might want to purchase a model that will provide you with the appropriate energy efficiency all the time. Carefully examine the different models on the market to find the ones that deliver on a high-quality performance while also saving on energy.

  2. Hot Water Capacity

    The hot water capacity is always one of the most vital considerations when buying a heater. The model you choose has to come with an impressive amount of capacity to fit the needs of you and your family. A unit with a 40-gallon hot water capacity should be suitable for an average household.

  3. High Flow Rate

    The flow rate of the unit is another key factor to keep in mind. You need to find a model with a high flow rate so that you will have an uninterrupted supply of hot water. Depending on the particular model, there are electric tankless water heaters that have a flow rate of up to 5 GPM. Of course, you’ll like the prospect of having hot water flow in the shower and faucets simultaneously.

  4. Space Availability

    The available space is a very key factor to keep in mind before shopping for your water heater at all. At times you might end up with an extremely large model that can’t fit in the available space. Therefore, you have to consider buying a compact model that can fit in different spaces for easy installation. Apart from being compact, it also needs to be fully functional.

  5. Installation

    It makes no sense whatsoever if you buy a model without thinking about how it will be eventually installed. Some models will be easy to install while some will require some special skills. As a result of this, you need to get a model that doesn’t require specified training for set up. Apart from that, also ensure that the unit you are buying offers all the necessary accessories required for installation.

  6. Warranty Terms

    Electric tankless water heaters are usually built to last for a long time. A good warranty, sometimes, is all you need for that much-needed peace of mind on your purchase. Depending on the particular brand, the warranty terms might vary most often than not. Choose a model that comes with a longer warranty period for a guarantee on its durability. Some models are backed by a lifetime warranty, which could be great for your overall confidence in your purchase.

What Size Electric Tankless Water Heater Do I Need?

Primarily, there are three factors influencing the size, when it comes to the flow rate required for your needs.

  • Incoming Water Temperature

    The incoming water temperature is the most vital factor when deciding the size of your electric water heating system. The lower the temperature, the bigger the heater you’ll require.

    Based on the amount of a temperature increase you require in the winter, you’ll need to make adjustments accordingly. Generally, Northern states will need the largest available flow rate powered by natural gas, while Southern states may manage to make do with small electric tankless water heaters.

  • Peak Demand

    Use the table below to figure out the peak demand by summing all the types of your demand:

    Bathroom Sink0.5 GPM
    Kitchen Sink0.5 GPM
    Dishwasher1.0 GPM
    Laundry Sink1.0 GPM
    Low-Flow Shower1.5 GPM
    Washing Machine1.5 GPM
    Standard Shower2.5 GPM
    It is vital to keep in mind that you can simply make policies not to run more than one water sources simultaneously so as to save on the size of heater you require. Additionally, you can get away with a little less if your incoming water temperature is over 67F since much temperature rise is not required.
  • Dwelling Size

    The size of your home and the number of individuals living there have a huge impact on the demand for hot water.

    Apartment / Condo13.0 GPM
    Small House (<1000 sq. ft.)14.0 GPM
    Average House (<1600 sq. ft.)27.5 GPM
    Large House (1600+ sq. ft.)3+10.0+ GPM
    We have compiled a simple table, for the purposes of approximation.
  • Water Hardness

    All electric tankless water heaters will regularly require maintenance, based on the hardness of the water. While not related directly to size, it is a crucial factor to take into consideration when shopping for an electric model. If the incoming water in your house is specifically hard, then you need to consider getting an infrared electric tankless model, which does not accumulate limescale and calcium.

How to Size a Tankless Water Heater

After taking the incoming water temperature, your peak demand requirements, and the hardness of the water into consideration, you can make a cognizant verdict about the size of the electric water heater you require.

Keep in Mind!

Purchasing an electric on demand water heater is one of the smartest decisions you’ll ever make. Buy the ideal size for your needs depending on the devices you’ll use with the electric tankless water heater. The primary factors are the flow rates required and the incoming water temperature.

If you live in the northern hemisphere, an electric tankless heater may not provide sufficient hot water to a whole house. Therefore, we recommend you to install a separate electric tankless water heater in every room where hot water is required.

What does Point of Use Mean for Electric Tankless Water Heaters?

Essentially, a point of use water heater is a mini water heater. They can either be tankless or feature a storage tank, and they are engineered to serve 1 to 2 water outlets i.e. powder room, garage or shower. Since they are smaller in size, they’re perfect for commercial applications and residential applications where there is minimal space.

Normally, you can install a point of use water heater very close to the final delivery point. For instance, besides a shower or beneath a kitchen sink. As a result, the hot water arrives in the least amount of time possible after you turn it on. A little delay is caused by the pipes flushing from the point of use and the unit. Unlike a central water heating system, however, the delay will only be for a couple of seconds.

Don’t mistake a point of use water heater for an instant hot water dispenser. Although they are the same concept-wise, instant hot water dispensers usually come with a limited water storage capacity (below 0.75 gallons most times). Also, the temperature of the water can cause injuries to the skin.

Installation & Maintenance of Electric Water Heaters

how to install a tankless electric water heaterHow to Install An Electric Tankless Water Heater?

  1. Find the appropriate amp needed for installation

    The first step you have to take is finding the appropriate watt and Amp requirement for installation. These requirements are single to find – just find the volt and watt on the level of the device. Then divide both figures by each other and you’ll have the Amp required to install your water heater.

  2. Circuit breaker stress test

    The circuit breaker’s capacity is a huge factor when installing an electric on demand water heater. Therefore, it is crucial to carry out the appropriate stress test on the circuit breaker. Generally, if your electric tankless water heater requires around 60 amps circuit breaker, then you need to pick 72 amps (60X1.2) breaker or whatever the available amps that are close to that amps value. So, calculate accurately, properly compare, and check your current circuit breaker if it is compatible. Then you don’t need to set another one.

  3. Properly check the manual

    • Properly check the instructions on the manual before installation.
    • If the manual asks for the installation to be done by a professional plumber then do what is instructed by the manual. Failure to call a licensed plumber for the installation, your warranty will be voided.
    • Properly check the electric rating plates to find the wattage and voltage. This is one of the most important things to do during the installation of your water heater in order to get optimum performance from the unit.
  4. Properly check internal wire connections

    An electric tankless water heater requires one to six circuit breakers. The internal wires are connected to the circuit separate terminals.
    First of all, you have to determine the number of circuit breakers your electric tankless water heater requires. To figure out the right number of circuit breakers, you need to carefully check the manual. Be sure to set that breaker(s) according to the user manual.

  5. Install some extra devices if required

    It is true that electric water heaters are not capable of heating water up as quick as gas water heaters. They basically use a lot of energy to deliver on-demand hot water. Consequently, you need to take initiatives to lessen energy consumption. To lessen your water heater’s energy consumption, you can set up a tempering tank to heat up the incoming water.

    Essentially, tempering tanks keep the lower thermostat setting which will decrease the energy consumption eventually. If you are looking to get low water pressure then you need to install low-flow shower heads. However, if the water flow travels at a low pace in the pipe then it may not be able to activate sensitive parts of the flow sensor.

Check out the places you should install a POU tankless water heater

How to Maintain/Flush an Instant Electric Water Heater?

  1. Begin by turning the energy source off

    Of course, an electric tankless water heater runs on electricity. Therefore, you must always turn off its power source before carrying out maintenance. Remove the cover of the unit and verify that the voltage is not in the system.

  2. Close every water valve attached to the unit

    Turning the valves off helps to keep water from dripping into the unit. Also, it prevents hot water from coming out of the unit during maintenance. There are usually 3 water valves which are often color-labeled in most cases.

    The blue valve serves to control the movement and flow of the cold water. The red valve serves as a control for the movement of the hot water. The 3rd valve controls the movement of water from the primary water source to your home.

  3. Unfasten the purge valve caps slowly from their individual purge calves

    Every purge valve features a little handle that looks like the letter “T”. Taking the caps off helps to relieve any build-up of pressure in the valves. Consequently, this keeps heated water from pouring out and potentially burning your skin.

    Essentially, you need to know that there is a probability of pressure when removing the valve caps. Thus, make sure that you securely shut off the hot water purge valves first to avoid injuries. You also need to carefully grip the caps to avoid putting the sealing discs out of place.

  4. Affix a hose to every valve

    You can buy a hosing line from a nearby store if your water heater doesn’t come with a hosing line. The one you buy has to be sufficiently long to connect the unit to the flushing bucket. Use the cold and hot water valves to connect the hosing line to a pump to release excess water.

  5. Open the purge port valves

    Simply twist and turn the port valves to make them be upright to the cold and hot water valves.

  6. Add vinegar

    To clean the electric tankless water heater, use 9.4 liters of pure white vinegar rather than the traditional chemical solutions. It is much safer to utilize organic cleaners instead of the chemical ones. Because, if ingested, it may be dangerous to your wellbeing. Leave the vinegar to sit in the compartment for 90 to 120 minutes. Then, drain the vinegar and fix the heating elements back into the chamber, tightening them in a clockwise rotation. Once the vinegar is drained, secure the wires to the top of the heating elements with your screwdriver.

  7. Flush and run out the unit or 45 minutes

    To flush the vinegar, open the Cold Water Shut-off Valve so that water can flow into the unit. During this time, inspect the unit for leaks. Then open the Hot Water Shut-off Valve. Lastly, open multiple hot water faucets. Let the water run for about five minutes to flush any remnants of vinegar and air pockets out.

    After flushing and draining the water heater, close the port valves by turning the “T” handles. Now disconnect every hose from the hot and cold water valves, then seal the purge valves with the port caps. Make sure the sealing disc is not broken. Consult the user manual for instructions on how to safely restart the unit. Although, it is easy to do. Simply rotate both the cold and hot water valves in a way that they’re positioned perpendicularly to the primary valve.

While electric tankless water heaters are less maintenance intensive, you still need to flush them regularly to ensure optimal performance. Flushing is a once a year chore. However, your unit might require more than one flushing depending on the hardness of the water in your area.

Electric Tankless Water Heater Pros & Cons

best-electric-tankless-water-heaterAdvantages of Electric Hot Water Heaters

  • Convenience:

    When comparing electric to gas models, electric tankless water heaters are more convenient to use. There is no need to waste gas in order to keep the pilot light burning. It can actually be turned off when you’re not using it. Most people don’t find it convenient to be relighting it each time the heater is to be used. Besides, you can rest assured that they are very safe to use since they operate on electricity. Be sure to check “electric vs gas tankless water heaters” full review for further information!

  • Cost-Effective:

    When you install a new electric tankless water heater, they effectively reduce the cost of on-demand hot water. They are extremely energy efficient. There are numerous energy-efficient products you can use for saving costs on energy to make your water heater more beneficial.

  • No Electricity Wastage:

    Another major benefit of electric tankless water heaters is that they heat only the amount of water necessary. Since it doesn’t store any water, no additional energy is needed to heat up the remaining water. This way, you’re not only enjoying a hot shower but also saving on energy bills.

  • Conserves Water:

    Electric tankless water heaters prevent all sorts of water wastage. Since they heat up water on demand only, the odds of wasting water is very low. You don’t have to waste water whilst waiting for the device to heat it up since it takes only seconds. This means that apart from conserving water, electric tankless water heaters are also environmental friendly.

  • No Chance of Ever Running out of Hot Water:

    It doesn’t really take many factors to keep electric tankless water heaters running. Just make sure your house always has electricity, and you will never run out of hot water.

Disadvantages of Electric Hot Water Heaters

  • Costly in the Long Run:

    The initial installation expenses of these units is a lot lesser when you compare them to gas models. It might even turn out to be costly over the long term. The explanation behind is that electricity is much more expensive than gas. So, you might save cost on the installation, but that money might be needed again for the energy bills.

  • No Electricity, No Hot Water:

    Sadly, this is true about electric on demand water heaters. They rely on electricity completely to function. So, if there is ever a power outage in your house or region, you won’t have any alternative than to manage a cold shower.whole house electric tankless water heater


  • Q: Are electric tankless water heaters energy efficient?

    When it comes to energy efficiency, nothing beats electric tankless water heaters. They regularly achieve an energy efficiency score in the range of 98-99 percent. This makes them better than gas tankless heaters in terms of energy efficiency. Here are some features to consider while buying a high-efficiency water heater.

  • Q: How much electricity does a gas tankless water heater use?

    Gas tankless water heaters primarily use natural gas as fuel. However, most models actually require electricity to get the pilot light to burn. This starter creates a spark, which then ignites the gas to start heating up the water you’ll use to take your shower. For more information, read our detailed gas tankless water heater buying guide.

Also, be sure to check out our homepage at waterheatermag.com and RV tankless water heater reviews!

Best Electric Tankless Water Heaters Comparison Chart

Stiebel Eltron 24 Plus Tempra Whole House$$$$14,5 x 16,5 x 4,52"16 lb.4.68 GPM7 years
Eccotemp ET-32 Residential$$$15.5 x 15.5 x 6.25"23 lb.4 GPM10 Years
EcoSmart ECO 27 Whle House$$17 x 17 x 3.75"13.75 lb.5.3 GPMLifetime
Rheem RTEX-24 Residental$$$$19 x 17.63 x 4"17.8 lb.5.90 GPM5 years
Thermoflow Elex 24 Whole House$$18.6 x 10 x 4.5"8.4 lb.3 GPM5 years
Marey ECO150$$14,2 x 8.7 x 3.5"10.1 lb.3.5 GPM5 years
Eemax EEM24018 POU$$17 x 14 x 3.7514.5 lb.3.5 GPM5 years
Ecosmart ECO 11$$11,5 x 8 x 3,75"6.5 lb.3.20 GPMLifetime
Sio Green IR30 POU$$13.5 x 8.5 x 3"6.4 lb.0.5 GPM2 Years
Sio Green SIO14$$$20 x 14 x 6"26.9 lb.4.40 GPM3 years
Bosch Tronic 3000$12,75 x 6,5 x 3"5 lb.1.80 GPM5 years

Wrap Up

Generally, electric tankless water heaters are a lot more efficient than the traditional tank-style models or gas models, particularly for home applications. These units use the least amount of energy to deliver the maximal amount of hot water. In fact, most households making a switch to electric on-demand water heaters usually have their water heating energy costs reduced by 15 percent or more, which is truly remarkable.

However, in order to buy the best electric tankless water heater for your needs, you need to take key factors such as sizing, efficiency, flow rate, and climate into consideration. Even when financially constrained. With all the tips and electric tankless water heater reviews in this guide, we are confident that you’ll choose the perfect fit for your needs.

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