7 Best Electric Tankless Water Heaters (Reviews of 2020)

Tankless heaters give you unlimited hot water on-demand and can help lower your electricity bills at the same time, so it’s no wonder so many people are making the switch.

If you are looking to install one in your home, here are our picks for best electric tankless water heater to help you chose the right model for you.

OUR TOP PICK
Ecosmart ECO Electric Tankless Water Heater
Ecosmart ECO Electric Tankless Water Heater

  • Advanced self-modulation technology – can reduce electricity bills by up to 60%
  • Durable unit – features copper and stainless-steel components
  • Lifetime residential warranty – for extra peace of mind
  • Easy to use – features intuitive digital controls
  • Highly efficient – energy efficiency of 99.8%

BUDGET PICK
Marey Power Pak Plus Tankless Electric Water Heater
Marey Power Pak Plus Tankless Electric Water Heater

  • Inexpensive option – a budget-friendly water heater
  • High efficiency – can help reduce bills by up to 60%
  • Easy to use – uncomplicated controls
  • Includes filter on inlet – helps avoid damage due to sediment
  • Powerful enough for multiple fixtures – but only in warmer climates

 

The Best Electric Tankless Water Heater Reviews of 2020

1. Rheem 2 Heating Chambers RTEX-18 Residential Electric Tankless Water Heater

Rheem 2 Heating Chambers RTEX-18 Residential Electric Tankless Water Heater

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This is an electric tankless water heater from well-established brand Rheem. When talking about high-quality heaters, Rheem is a brand that is always part of the conversation, and this heater lives up to the company’s reputation.

It features an advanced self-modulation system that adjusts itself according to the demand for hot water – when demand is high, it uses more power, but when demand drops, it conserves energy. This can help reduce electricity bills by up to 50%. This unit also runs very quietly.

It boasts an external digital thermostatic control with a clear LED display. This allows you to select the water temperature you require with an accuracy of ±1°F.

Another outstanding feature is the durable dual copper immersion elements – these are high-quality components that are designed to last. The heater comes with a five-year warranty for the heating chamber and a one-year warranty for parts.

This heater is designed to be simple to install – if you have the necessary skills, you should be able to install it yourself without the need to call on the services of a professional, saving you money. It is a compact unit, making it easy to find somewhere to fit it.

On the downside, it may struggle if you try to push it too hard. It can cope with providing hot water to a couple of fixtures, but if you ask too much of it, it might let you down. Calculate the power you need and make sure you choose a model with appropriate power.

The only other negative is the price since this is not a cheap unit – however, for such a quality piece of equipment from a brand like Rheem, you have to expect to pay more, and we feel this is still an option that represents great value for money.

Overall, a solid option if you are looking for a reliable and efficient heater for light to moderate use. If this unit is powerful enough to meet all your hot water requirements, it’s a model that should be high on your list of possibilities.

Pros

  • External digital thermostatic control with LED – ±1° accuracy
  • Advanced self-modulation system – adjusts itself to meet hot water demand
  • Durable dual copper immersion elements – efficient and made to last
  • Simple installation – DIY installation possible
  • Compact unit – small footprint

Cons

  • Can struggle with multiple fixtures – depending on flow, temperature etc.
  • Not cheap – but worth the higher price tag

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2. Rheem 4 Heating Chambers RTEX-36 Residential Electric Tankless Water Heater

Rheem 4 Heating Chambers RTEX-36 Residential Electric Tankless Water Heater

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If you like the sound of the Rheem model above and want something with all the same features but need something with a bit more power to provide water for more fixtures, this could be the ideal solution.

It is essentially a very similar unit to the one we looked at above, just on a larger scale.

This version boasts four copper heating immersion elements, providing much more heating capacity. If you need hot water for several showers as well as a couple of other household applications, this heater should be up to the task.

It features the same advanced self-modulation system that allows it to deliver just the amount of power required to meet the demand for hot water. As with the smaller version, this can help reduce electricity bills by up to 50%.

It also includes the same external digital display with the LED readout. This makes controlling it simple and intuitive, allowing you to select the temperature of the water with an accuracy of ±1°F.

Despite its increased power, it is still a very compact unit, meaning it should be no problem finding somewhere convenient to install it. Installation is easy, and anyone with the necessary skills should be able to fit it without any significant issues.

This is a heater that is built to last – and Rheem stands behind its product with a warranty of five years for the heating chamber and one year for parts.

The main issue with this heater is the price since it’s even more expensive than the smaller version. However, for what you get, it represents exceptional value.

Another point to note is that it requires 150 amps to run – you should check that it will operate correctly in your home or make the necessary alterations required.

This unit would be a great option for anyone who needs a powerful electric tankless heater that is big and powerful enough to provide water for multiple fixtures. If the price tag doesn’t put it out of reach, this comes as a highly recommended pick.

Pros

  • Increased capacity – capable of providing water for more fixtures
  • Advanced self-modulation capability – helps conserve energy and save money
  • External digital thermostatic control with LED – offers accuracy of ±
  • Simple to install – possible to install without the need for professional help
  • Good warranty – 5 years for heating chamber, 1 year for parts

Cons

  • Expensive unit – but exceptional value for the quality
  • Requires 150 amps – not all homes can cope without modification

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3. Ecosmart ECO Electric Tankless Water Heater Our Top Pick

Ecosmart ECO Electric Tankless Water Heater

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This is an electric tankless heater from EcoSmart. As you may guess from the name, this is a company that specializes in producing efficient and ecological heaters, and if you are looking for a unit that will help reduce your energy bills, this model could be worth checking out.

It is powerful enough to provide hot water for two sinks and two showers in warm climates – or one shower and one sink if the groundwater is colder.

It boasts some of the most advanced self-modulation technology currently available, meaning it consumes only the energy it needs to meet hot water demands and no more. When the demand for hot water is low, it reduces power consumption to the minimum.

It is also highly efficient – its energy efficiency is rated at 99.8%, meaning almost none is wasted. The self-modulation technology coupled with this high level of efficiency enables it to help reduce your electricity bills by up to 60%.

We also like the intuitive digital controls. It is extremely easy to operate, and it allows you to select a water temperature of 80°-140°F with an accuracy of 1°F.

It is a durable unit with components made of copper and stainless steel. The company that makes it is so confident about its product that it is willing to stand behind it with a lifetime residential warranty.

Unfortunately, this warranty depends on the unit being installed professionally. Although it is simple to install, if you do it yourself, you will void the warranty.

The only other real downside is that it will struggle if you try to use too many fixtures at the same time, especially in colder climates.

However, if you need more power, larger models exist, so if you know you will need more power, you should buy a model that matches your requirements.

Overall, there’s a lot we like about this heater. It’s compact, efficient, good for the environment, it sells at a very reasonable price point and it will save you even more money down the line. If this model is powerful enough for your needs, it comes highly recommended.

Pros

  • Advanced self-modulation technology – can reduce electricity bills by up to 60%
  • Durable unit – features copper and stainless-steel components
  • Lifetime residential warranty – for extra peace of mind
  • Easy to use – features intuitive digital controls
  • Highly efficient – energy efficiency of 99.8%

Cons

  • Only works with a limited number of fixtures – although bigger versions exist
  • Requires professional installation – or you will void the warranty

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4. Marey Power Pak Plus Tankless Electric Water Heater  Budget Pick

Marey Power Pak Plus Tankless Electric Water Heater

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If you are looking for a way to heat water for less and you live in an area with a hot climate, this inexpensive electric tankless water heater could be a great pick.

It is easy to install and use. We like the simple and uncluttered controls – it doesn’t give you lots of unnecessary extras that you probably don’t need. Instead, it keeps things as basic and uncomplicated as possible.

It has a very high efficiency rating, allowing it to save you up to 60% on your bills. It also has a filter on the inlet, helping to protect against damage from sediment and ensuring it will keep working for longer.

This unit can provide hot water for multiple fixtures simultaneously – although it is important to understand its limitations.

If you live in an area with a hot – i.e. tropical – climate, it is powerful enough to provide hot water for two fixtures at the same time, for example, two showers or a shower and a dishwasher.

However, if you live in an area with a climate that is anything less than tropical – i.e. most of continental USA – it will struggle with more than one fixture being used at the same time.

In that case, it could still be an option but would work best as a point-of-use heater rather than one for a whole house.

Another point to bear in mind is that it might not have enough heating capacity to provide hot water for a bath – this is because baths have a higher flow rate than showers, and this model might not be able to heat the water fast enough.

To summarize, this would be an excellent option for heating water for a small house in a tropical region or alternatively as a point-of-use heater anywhere cooler.

In either of these situations, it could be a smart pick than can potentially save you a lot of money. However, if you need a heater for more intensive use or in a colder area, this unit is probably not the right solution for you.

Pros

  • Inexpensive option – a budget-friendly water heater
  • High efficiency – can help reduce bills by up to 60%
  • Easy to use – uncomplicated controls
  • Includes filter on inlet – helps avoid damage due to sediment
  • Powerful enough for multiple fixtures – but only in warmer climates

Cons

  • Not ideal in colder climates – works best in warmer areas
  • May not have the power to heat water for a bath – due to higher flow rate

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5. Stiebel Eltron Tempra Plus 29 kW Electric Tankless Water Heater

Stiebel Eltron Tempra Plus 29 kW Electric Tankless Water Heater

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This is an advanced, powerful electric tankless water heater from well-respected German Brand Stiebel Eltron. This brand has been around for nearly 100 years and specializes in making high-quality, high-performance heaters – and this unit is no exception.

This model is part of the Tempra Plus line and features Advanced Flow Control technology. This allows the heater to reduce flow slightly when demand exceeds supply, ensuring there is no break in the hot water.

It also boasts electronic control to ensure there is always a consistent, constant flow of hot water. With the onboard intelligent self-modulation technology, this unit also helps reduce water bills by using the minimum amount of power required.

The manufacturer calculates you can save 15-20% on the water part of your electricity bill by installing this unit.

On the downside, since this is a big and powerful unit, you will probably need to do a certain amount of electrical work during installation since most homes won’t have the necessary wiring to accommodate it.

Make sure you have the right size of wiring and appropriate breakers.

Also, despite its power, it may still struggle in challenging conditions – if you use it during winter in a cold climate and try to run several fixtures at once, you may find it doesn’t produce enough hot water for everything.

However, apart from in the most extreme conditions like this, it can provide plenty of water for most people’s requirements. If you want a high-end, powerful electric tankless water heater, this is an option that should be on your radar.

Pros

  • Advanced Flow Control tech – slows flow slightly if demand is too high
  • Intelligent self-modulation – saves energy by consuming less power
  • Electronic control – provides a constant, consistent flow of hot water
  • No venting required – makes installation easier
  • Compact unit – easy to find somewhere in your home to fit it

Cons

  • Will probably require electrical work – most homes won’t have the necessary wiring
  • Struggles in difficult conditions – e.g. cold climates with several fixtures running

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6. Stiebel Eltron 24 Plus Tempra Electric Tankless Water Heater

Stiebel Eltron 24 Plus Tempra Electric Tankless Water Heater

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If you like the sound of the Stiebel Eltron model above but you feel it sounds a bit like overkill for your situation, this smaller model might be the ideal solution.

It is essentially a very similar unit – just in a smaller package. This means it features the same Advanced Flow Control system that can slow the water flow slightly to compensate when demand increases too much.

With self-modulation, it helps conserve energy – and so saves you money on electricity bills – and it has the same electronic control system that regulates the flow to ensure you always have a constant supply of hot water.

This all makes it a good ecological option, and it also runs quietly, so it’s a good pick if you don’t want a noisy water heater in your home.

It is a relatively expensive unit, so if your budget is limited, it could be out of reach. However, it will save you money in the long run and could be a good investment for the future.

Also, make sure you calculate your water requirements carefully before deciding which unit to go for. If you need to use several fixtures at the same time if you live in a colder climate zone, this unit might not have the power for your needs.

This heater would appeal to anyone who needs a high-quality electric tankless water heater for a small to medium home and who doesn’t mind paying more for superior equipment. If that sounds like you, this is an option that could be well worth checking out.

Pros

  • Intelligent self-modulation tech – conserves energy when possible
  • Advanced Flow Control system – slows flow to help meet demand
  • Constant flow of hot water – thanks to electronic control
  • Good eco option – kind to the environment
  • Quiet unit – makes very little noise

Cons

  • Relatively expensive – but a good investment
  • Less powerful model – better for small to medium-sized homes

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7. Eemax EEM24027 Electric Tankless Water Heater

Eemax EEM24027 Electric Tankless Water Heater

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This is another efficient tankless water heater that will help reduce electricity bills compared with a tank water heater.

It incorporates self-modulation to reduce power consumption when less power is needed, allowing it to use only the minimum amount of electricity to heat the water required.

It is a compact heater, meaning you should easily be able to find somewhere to put it. It’s easy to install, too, and the instructions included with it are very helpful.

This unit can simultaneously provide water for a shower and two sinks in colder areas or four showers or sinks in hotter climates. However, if this is too much power for your needs, it is available in smaller sizes, making it a highly versatile option.

Having said that, if you live in a colder area and you try to run too many fixtures at the same time, it may struggle – it may also have trouble if you try to fill a bath with hot water due to flow rate issues.

Also, it is a relatively expensive option. It is a solid unit, but the manufacturer is not among the best-known, and some people might not like to spend so much money on something made by a company they don’t know much about.

In sum, this is a solid option that does the job it’s made for reliably and without any fuss. If the specs match your requirements, this could be another option worth considering.

Pros

  • Incorporates self-modulation technology – helps to conserve energy
  • Easy to install – includes clear instructions
  • Compact unit – easy to find somewhere to place it
  • Helps reduce bills – more efficient than running a heater with a tank
  • Available in other sizes – a versatile option

Cons

  • Struggles with too many fixtures in colder climates – but normal for tankless heaters
  • Not cheap – especially for a lesser-known brand

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Buyer’s Guide

best electric tankless water heater

Before we look at the reviews, let’s think about some of the things you should consider when buying an electric tankless heater.

Water flow and groundwater temperature

Tankless heaters work by heating water on demand rather than keeping water hot in a tank. However, they can only heat a certain volume of water as it flows through, and if demand for water exceeds the heater’s capacity it won’t be able to keep up.

For this reason, you need to work out your flow requirements. This essentially means working out how many fixtures you hope to run simultaneously.

For example, if you need water for three showers and a washing machine at the same time, you will need a more powerful heater than if you just need water for one shower and a sink.

The temperature of the groundwater where you live is also important since it takes more power to heat cold water to the required temperature than if the groundwater is already relatively warm.

When you know your flow requirements and the temperature of the groundwater in your area, you can work out the size of the heater you need to buy.

Manufacturers of tankless heaters provide tables to help you calculate this, and the most important thing when choosing a tankless heater is to make sure you buy the right size for your needs and climatic conditions.

Efficiency

One of the reasons to choose a tankless heater is that they can help reduce your bills – and choosing one that has a high energy efficiency rating can help lower your bills even more.

Control system

Is it easy to control? The controls should be simple to understand and intuitive to use.

Self-modulation

The best tankless heaters self-modulate, reducing energy consumption when demand is low, helping to save even more money on electricity bills.

Size

Another advantage of tankless heaters is their smaller size compared to tank heaters. By choosing a unit with a small footprint, you can save extra space in your home.

Ease of installation

Many tankless heaters are easy to install, and you may be able to save some cash by doing it yourself. If you want to do the work yourself, pay attention to how easy it is to install the unit. Be careful, too, that installing it yourself won’t void the warranty.

Warranty

Check how long the warranty is. A tankless heater should last a good few years – and choosing one with a generous warranty means you are covered if anything goes wrong.

Many great options

As you can see, there are many great options to pick from. If you have decided to invest in an electric tankless water heater but don’t know which one to go for, any of our picks in this review would be a great place to start your search.

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