Top 8 Best Tankless Electric Water Heater (2019) – A Must Read Before Buying

heatersAll homeowners will tell you that maintaining a home can be quite expensive. Something is always breaking down and needs to be fixed or replaced. However, the most expensive thing about owning a home is the energy bill. Having an outdated appliance can really make a dent in the home budget.

More and more people have started turning to modern ecological and cost-effective solutions. One of the best solutions to a big water bill is a tankless electric water heater. Upkeep and maintenance are incredibly simple, and the heaters will save a lot of money in the future.

Because I want to save you money, I’m going to give my top choices for the best water heaters review on the market. If you want to know how to choose the best water heater for you — keep on reading.

8 of The Best Tankless Electric Water Heaters Today (2019) – A Comparison Highlight

Here are the 8 electric tankless water heaters that we have given a summary of what we have learned and researched about. We encourage you to read this before jumping in the full product review below.

Product Name

Description

Check

EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5...

EcoSmart ECO 27

EcoSmart has created an innovative self-modulating technology which can save a lot of water and power. The heater also comes with a limited lifetime warranty.

Check Price 

Stiebel Eltron 224199 240V, 1 Phase, 50/60 Hz, 24 kW Tempra 24 Plus Whole...

Stiebel Eltron 224199 240V

This tankless water heater has a sleek design, and the major components are recyclable. Also, it features an innovative technology which helps with water flow.

Check Price 

Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater

Rheem 240V

Rheem’s heater is a great choice for smaller households. Also, it has a self-modulating feature, and the 5-year warranty is an excellent bonus.

Check Price 

Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas

Takagi T-KJr2-IN-NG

Takagi’s water heater is a great fit for smaller households. Moreover, it has numerous safety features that will prevent the unit from overheating or freezing.

Check Price 

Bosch Electric Tankless Water Heater - Eliminate Time for Hot Water - Easy...

Bosch Tronic 6000 C

The hot water supply is enough to power three bathrooms in a warmer climate. Also, it is 97% energy efficient.

Check Price 

EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with...

EcoSmart ECO 11

This is one of the best heaters for hand-washing. I recommend using it in bathrooms, wet bars, or recreational vehicles. There is a 1-year limited warranty for this unit.

Check Price 

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater, Twin Pipe

Rinnai RUC98iN

The Rinnai is compact and easy to install. It has the capacity to supply hot water to three taps simultaneously and has an excellent warranty.

Check Price 

Stiebel Eltron 29 Plus Tempra, Tankless Water Heater, White

Stiebel Eltron 29 Plus

Amazing Advanced Flow Control features, combined with the temperature memory setting, make it a great heater for smaller households.

Check Price 

When to Replace Your Old Water Heater

There are a few things that will determine when you should change the water heater. Even though it might seem that the unit is working fine, here are four telltale signs you need a new one.

1. Expired Warranty

The sad man counts money for repair of a gas water heaterNow, most of us won’t throw away an appliance just because the warranty expired, and why would we? However, throwing out an appliance with an expired warranty is necessary.

First, an expired warranty means you can’t get any new parts from the manufacturer for free. Also, since most water heaters have a warranty of about 12 years, consider how many things could’ve changed or improved over that period of time.

A new electric water heater will save more energy, and ultimately, more money.

2. Leaking Water Heater

Having a water heater that leaks is a pretty obvious sign that it’s time to invest in a new one. A leaky water heater can cause a lot of structural damage to a home. Also, calling in a plumber to fix the heater might cost more than actually replacing the entire system.

3. Quickly Running out of Hot Water

If the water takes too long to heat or is always lukewarm, the old water heater has probably stopped working. Running out of hot water while showering or doing the dishes can be extremely frustrating. Usually, there is no simple fix for this problem, so buying a new water heater is the best solution.

4. Different Building Codes

Keeping the house or apartment up to code is crucial. While the codes might seem like a nuisance at first, they are there for a reason. Keeping the water heater up to code can save a lot of time and money. Also, keep in mind that different countries have different building codes. Depending on the state you live in, the old heater you have might not be up to code anymore, and the inspector will demand that you change it.

How to Choose A Electric Water Heater

Now, there are a few things to consider before you can find the tankless water heater for you. There are three types of tankless heaters. I’m going to talk about all of them and see what their benefits and drawbacks are.

1. Non-condensing

The non-condensing units use a heat exchanger to heat the water on-demand. These first-generation heaters have been used in Europe and Japan for the past few decades and have proven to be highly effective. Moreover, they are extremely reliable and popular. Most manufacturers make technician servicing a hot water heaterthese water heaters, and they are easy to find in stores.

The biggest drawback of the non-condensing type is the hot exhaust. Purchasing a non-condensing heater means you also have to invest in a stainless steel venting system, which can be expensive. Also, they are not as efficient as the other two types. They can drain a lot of hot water in short draws, such as washing hands or dishes.

2. Condensing

These second-generation water heaters use two types of heat exchangers. After the first heat exchanger goes off, the second one will reuse the heat from the exhaust.

By doing so, it produces more hot water. Also, they are about 90% more efficient than non-condensing water heaters. Furthermore, the main benefit of using a condensing heater is that they can be vented with the help of inexpensive PVC systems. However, they are a bit more expensive to install than non-condensing systems. Also, they share a similar issue with short draws of water.

3. Condensing Hybrid

Condensing hybrids were first manufactured in the US. They can hold between 1 and 14 liters of water in a holding tank, which eliminates the short draw issue. Compared to the two previous types, they are 96% more efficient. Same as the condensing type, they can be vented by using an inexpensive PVC system. Furthermore, they are much faster than the two previous types when it comes to delivering hot water.

On the other hand, since the technology is relatively new, only smaller companies manufacture them. There have also been some quality and warranty issues with this type of water heaters. But, all things considered, a condensing hybrid has the potential to make the electric tankless water heater.

Doing Proper Maintenance

As with any other appliance, if you take good care of it, you can ensure it lasts much longer. Moreover, doing upkeep on your heater will help with sediment buildup, excessive noise, or low levels of hot water. Here are a few things you should check once every six months:

  1. Storage tank
  2. Heating elements
  3. Thermostats
  4. Temperature and pressure relief valve

It is also important to clean the heater on a regular basis to prevent limescale buildup. Ignoring limescale is never a good idea as it can seriously damage the heater. It can decrease its overall efficiency and compromise the water supply.

A great alternative to using heavy-duty cleaning products is white vinegar. While different cleaning products and chemicals might seem effective, they can also potentially damage the heater. White vinegar is completely safe to use, and it is a greener approach to cleaning.

Electric silver boiler, water heater 2

Finding the Right Size for You

The reason tankless water heaters have become so popular is that they can deliver hot water on demand. Choosing a good size for your home is the key to saving money and energy. Some heaters will only work for a two-person household, while others can supply a small village.

Also, the climate you’re in will decide your water heater size. Colder climates usually require much larger heaters. Let’s take a look at which company makes the best tankless water heater and how to make sure you’re choosing the right one for you.

My Top Picks

Now, let’s talk about my top choices for the tankless electric water heater. I’m also going to discuss all of their features and benefits and include a short explanation of different sizing guides. I’m even going to tell you who my winner for the tankless water heater reviews is and how you can make it work for your home.

1. EcoSmart ECO 27

EcoSmart ECO 27

EcoSmart focuses on making and distributing green energy products. Furthermore, all of their products can be used in commercial, residential, and industrial settings. The ECO 27 is one of my top contenders for the house tankless electric water.

The ECO 27 model is one of the most powerful water heaters in the ECO line. The electric tank is big enough to supply water to a large household, even in colder conditions. Furthermore, the water heater comes with a lifetime limited warranty. The warranty means that EcoSmart will replace any parts that have broken over the heater’s life.

Also, they claim this model can save up to 50% on your water heating costs. All of the components are made out of copper and stainless steel. The heater has self-modulating technology. With this technology, the heater will adjust the energy usage on its own based on how much hot water you need.

Sizing Guide

This particular model from Eco will be most efficient in a warmer climate. For people living in California, Florida or Arizona, the heater can supply enough hot water to four shower faucets and one hand sink. Someone from the midwest, for example, could turn on two shower heads and a hand sink at the same time and still have hot water.

However, all of my readers who live in the northern parts most likely won’t have that kind of hot water supply. Eco says that the heater will produce enough hot water for two showers. That being said, while the hot water supply is good, it might take more time to get the hot water running. I recommend checking the sizing guide to find which heater will best fit the climate in your state.

PROS:
  • Great for a large household
  • Saves up to 50% on water bills
  • Made out of copper and stainless steel

CONS:
  • Potential to corrode
  • Limescale buildup

Sale
EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5...
  • Savings of up to 50% on water heating costs. Dimensions :17H x 17W x 3.625D inches ;Pipes fittings :3/4 inch NPT
  • Digital temperature control in 1-degree increments allows control of hot water; Activation Flow: 0.3 GPM
  • Copper and stainless components designed for efficiency, durability and easy replacement.
  • Compact size saves valuable storage space, while the stylish and advanced design is pleasing to the eye and Copper and stainless components designed for efficiency, durability and easy replacement.
  • Prior to purchase & installation, please verify that this model is the right size for your hot water needs and electrical requirements. Electrical requirements: 27 kW, 240 volts, (3) 40 required...
  • Required Breaker Quantity: Three 40 Amp Double Pole
  • Recommended Electrical Panel: 200 Amps
  • NEVER run out of hot water with an ECOSMART tankless water heater.
  • Save up to 12 cubic feet of storage space.
  • Digital temperature control in 1-degree increments gives users complete control of hot water

Last update on 2019-07-18 at 22:00 / Affiliate links / Ratings / Images from Amazon Product Advertising API


2. Stiebel Eltron 224199 240V

Stiebel Eltron 224199 240V

Stiebel has been an industry leader for years when it comes to manufacturing water heaters. They have one of the biggest selections of electric tankless water heaters on the market. Moreover, they also make various hand-washing products, as well as water pumps and electric fans.

The heater features the company’s trademark Advanced Flow Control technology. It will limit the water supply and decrease the pressure slightly if the water demand is too high. However, even though the pressure is lower, the water will still be at the desired temperature. Also, just as the Eco 27, this water heater has the self-modulating technology. Thanks to that feature, it will reduce the overall energy consumption.

Now, I would recommend this heater to anyone working with a small space. The model has a sleek design which can be incorporated almost anywhere. Also, it is much easier to dispose of once it stops working. Finally, all of the major components of the heater are completely recyclable.

Sizing Guide

Now, compared to the ECO 27, the Eltron isn’t as powerful. Stiebel claims that, in hotter climates, their heater could power hot water to three shower heads at the same time. However, that’s only for a couple of the warmer states in the US. For the most part, it will only supply one shower, and one hand sink at the same time.

Where it falls short for us is its hot water demand in colder climates. A water heater of this size can only power one fixture with hot water. Moreover, countries in the north-eastern part of the US will have a much weaker water flow. I recommend taking a look at Stiebel’s size chart. It might give you a better idea of where the heater will be most efficient.

PROS:
  • The advanced Flow Control feature
  • Great for smaller spaces
  • Components can be recycled

CONS:
  • Limescale buildup
  • Not enough hot water for multiple bathrooms

Sale
EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5...
  • Savings of up to 50% on water heating costs. Dimensions :17H x 17W x 3.625D inches ;Pipes fittings :3/4 inch NPT
  • Digital temperature control in 1-degree increments allows control of hot water; Activation Flow: 0.3 GPM
  • Copper and stainless components designed for efficiency, durability and easy replacement.
  • Compact size saves valuable storage space, while the stylish and advanced design is pleasing to the eye and Copper and stainless components designed for efficiency, durability and easy replacement.
  • Prior to purchase & installation, please verify that this model is the right size for your hot water needs and electrical requirements. Electrical requirements: 27 kW, 240 volts, (3) 40 required...
  • Required Breaker Quantity: Three 40 Amp Double Pole
  • Recommended Electrical Panel: 200 Amps
  • NEVER run out of hot water with an ECOSMART tankless water heater.
  • Save up to 12 cubic feet of storage space.
  • Digital temperature control in 1-degree increments gives users complete control of hot water

Last update on 2019-07-18 at 22:00 / Affiliate links / Ratings / Images from Amazon Product Advertising API


3. Rheem 240 V

Rheem 240 V

Rheem makes numerous heating and cooling systems for both residential and commercial use. While their boilers, furnaces, and thermostats are amazing, let’s take a look at why this model could be the tankless electric water heaters currently on the market.

Their Professional Classic water heater has an energy efficiency rate of 99.8%. This model has a self-modulating power control, and it can supply hot water to multiple sinks at the same time. The installation is quite simple, and it has a great design which can fit in almost any small space.

The heater is made from copper and brass. These two elements combined make the model much more durable, and the parts can be easily replaced. Also, the model comes with a 5-year primary warranty, which is two years longer than the Stiebel model.

Sizing Guide

This model has numerous applications. You can use it for a shower, sink, or dishwasher. Depending on where we put it, it will have different water pressure. However, Rheem claims that no matter which appliance it’s hooked up to, the heater can provide an uninterrupted flow of hot water. Furthermore, they say the number of back-to-back showers is limitless.

On the other hand, I wouldn’t recommend using more than one fixture at the same time. As soon as more than one faucet is open, the heater needs much more time to produce hot water. Also, from my experience, this can cause the hot water to run out quickly.

PROS:
  • Simple installation
  • Components made out of copper and brass
  • Great for a small household

CONS:
  • Takes a few minutes to get hot water
  • Hot water can run out quickly

Sale
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater
  • External adjustable digital thermostatic control with LED display (+/1 degree accuracy
  • Durable Copper immersion two heating elements, field Serviceable.Self-modulating power control
  • Simple installation - 3 foot electric cable and 1/2 NPT adapters included; side 1/2 inch Compression water connections
  • 99.8% energy efficient. External controls to adjust temperature in increments of 1°f. Water-Saver Shower Head - 1.5 GPM
  • Threaded for easy replacement, simple installation, digital temperature display
  • 54 A

Last update on 2019-07-18 at 22:00 / Affiliate links / Ratings / Images from Amazon Product Advertising API


4. Takagi T-KJr2-IN-NG

Takagi T-KJr2-IN-NG

Takagi is also one of my choices for the water heater reviews for residential use. All of their heaters have top-of-the-line safety features. With freeze protection, Hi-limit switch, and the overheat cutoff fuse, you will never have to worry about a breach in combustion.

The heater has a self-modulating feature which will help reduce the energy bill. It also has a remote control and a power cord. Most of the components are made out of stainless steel. Stainless steel components decrease the chance of limescale buildup forming.

The model comes with a 15-year heat exchanger warranty and 5-year limited warranty. The warranty only applies to heaters in residential use. Keep in mind that the warranty is only applicable if a licensed electrician installed the heater. Also, the heater requires category 3 stainless steel venting.

Sizing Guide

Since this model is a non-condensing unit, it’s better suited for smaller water applications. In colder climates, the heater can supply only one shower and one kitchen sink with hot water. Moreover, the tap needs to be running for a few minutes before the hot water reaches it. On the other hand, in warmer climates, Takagi says their heater is big enough to supply hot water to two shower heads and one kitchen sink at the same time. Nevertheless, I would recommend it for smaller households.

PROS:
  • Self-modulating feature
  • Made out of stainless steel
  • Various safety features

CONS:
  • Poor hot water supply with multiple faucets
  • Not recommended for bigger households

Sale
Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas
  • 140,000 BTU. Voltage: AC 120V
  • 6.6 GPM max flow rate. Water connection location- bottom
  • 4-Inch category III stainless steel venting required
  • Inlet, outlet thermistors for constant temperature monitoring
  • Energy factor of 0.81-0.83

Last update on 2019-07-18 at 22:09 / Affiliate links / Ratings / Images from Amazon Product Advertising API


5. Bosch Tronic 6000 C

Bosch Tronic 6000 C

Bosch is one of the most renowned and trusted companies in the world. From furnaces, boilers, to storage tanks, they have invested a lot in thermo-technology in recent years. It comes as no surprise that Bosch is one of my top contenders for the tankless water heater reviews.

The model is advertised as a “whole house electric heater,” which is supposed to provide enough hot water for both residential and commercial use. Depending on the application, Bosch says this heater can supply one to three taps with hot water at the same time.

With a minimal standby loss, it is 97% energy efficient. Also, the heater has a built-in flow sensor. The sensor will ensure a constant output temperature. Moreover, it has a filter screen on the inlet and scale resistance.

Sizing Guide

In warmer climates, the heater is able to produce enough hot water to supply two to three bathrooms. On the other hand, in colder regions, the heater will only be able to supply one bathroom with hot water. Before buying anything, you can check out this sizing guide to see which model will work best for your household. I would recommend this model for smaller apartments or office spaces, as well as in-law suites.

PROS:
  • Good for larger households
  • Built-in flow sensors
  • Lightweight with a sleek design

CONS:
  • Low-quality components
  • Poor temperature control

Sale
Bosch Electric Tankless Water Heater - Eliminate Time for Hot Water - Easy...
  • CONVENIENT TANKLESS HOT WATER HEATER: 17.3 kW tankless whole house electric water heater provides hot water when needed, for as long as needed
  • EASY INSTALLATION: Can be installed virtually anywhere for commercial or residential applications
  • CONSISTENT TEMPERATURE: Polymer encased elements & built-in flow sensor ensures constant output temperature
  • STABILITY & CONTROL: External temperature control knob & superior temperature stability and control
  • GREAT EFFICIENCY: 97% thermal efficiency with minimal stand-by loss

Last update on 2019-07-18 at 22:09 / Affiliate links / Ratings / Images from Amazon Product Advertising API


6. EcoSmart ECO 11

EcoSmart ECO 11

Next, we have another heater from EcoSmart. The ECO 11 is a smaller heater compared to the ECO 27 model. I believe it could be the tankless water heater review for smaller water applications, such as hand washing. It would make a great addition to any bathroom, recreational vehicle, or boat.

This model is a true point-of-use system with on-demand hot water at any moment. Also, it has a flow rate of half a gallon per minute and includes a sink aerator. It is a smaller model, and I would recommend using it only for a single sink. Using it for a shower or multiple fixtures would just cut the hot water flow.

All of the components are made out of copper and stainless steel. The unit is durable, and all of the parts can easily be replaced. Moreover, it is compact and can be stored almost anywhere. The ECO 11 also comes with a limited lifetime warranty.

Sizing Guide

The ECO 11 is comparatively much smaller than the ECO 27. In warmer climates, the heater could supply one shower and two kitchen sinks at the same time. However, the hot water supply is limited, and it takes a few minutes for the hot water to start running. On the other hand, in colder climates, it can only supply two kitchen sinks with hot water. I recommend checking ECO’s size chart to determine how well this unit would work for you.

PROS:
  • Compact size
  • Great for boats or RVs
  • Includes a sink aerator

CONS:
  • Limescale buildup
  • Small hot water supply

Sale
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with...
  • Lifetime warranty
  • Save up to 60-percent on your water heating cost with an ECOSMART electric tankless water heater
  • Never run out of hot water with an ECOSMART tankless water heater
  • Patented Self Modulating Technology and design
  • ECOSMART tankless water heaters are 99.8-percent energy efficient.Uniform Energy Factor:0.98

Last update on 2019-07-18 at 22:09 / Affiliate links / Ratings / Images from Amazon Product Advertising API


7. Rinnai RUC98iN

Rinnai RUC98iN

My next contender for the title of the tankless electric water heaters comes from the company Rinnai. The company focuses on manufacturing various heating equipment, such as heaters, boilers, and furnaces.

This model, which is the size of a suitcase, is easy to install and great for indoor locations. It is a condensing type of water heater, which means it is extremely energy-efficient. All of the heaters from their RUC line are Wi-Fi capable.

There are two types of warranties for this product — commercial and residential. The residential warranty covers 12 years for heat exchange, 5 years for part replacement, and a 1-year labor warranty. On the other hand, the commercial warranty is a bit shorter, as is expected. Both the heat exchanger and part replacement warranties are for 5 years, while the labor warranty is still one year.

Sizing Guide

This unit from Rinnai can supply multiple fixtures with hot water at the same time. However, if more than two faucets are running at the same time, the heater needs a few minutes to deliver hot water to both.

On Rinnai’s website, there is an excellent sizing calculator. All you have to do is choose your preferred usage and zip code. The calculator will ask to choose between condensing and non-condensing units. Moreover, you can choose if you want a heater with or without a tank.

PROS:
  • Compact unit
  • Easy to install
  • Supplies hot water to multiple sinks at the same time
  • Great warranty for both residential and commercial use

CONS:
  • Takes a long time to produce hot water
  • Poor customer support

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater, Twin Pipe
  • Concentric or PVC venting option
  • Up to 0.96 Energy Factor/Up to 0.92 Uniform Energy Factor
  • The space-saving design allows Indoor Installation type
  • Ultra low NOx emissions
  • 199,000 max BTU

Last update on 2019-07-18 at 22:09 / Affiliate links / Ratings / Images from Amazon Product Advertising API


8. Stiebel Eltron 29 Plus

Stiebel Eltron 29 Plus

Finally, we have another product from Stiebel. This model features some of their trademark heater technology, along with some new improvements. Let’s see why the Eltron 29 has the potential to be the tankless electric water heaters.

The heater comes with the Advance Flow Control technology for maximum energy efficiency. The LED display accurately shows the current water temperature. Also, the monitor will show the current water savings on the screen. There are two temperature memory settings. With them, you can save your desired temperature, which is an amazing time-saver.

This heater has a sleek and compact design, perfect for small spaces. Moreover, the installation process is quick and simple. All of the major components are made in Germany and are recyclable. Finally, the warranty only applies when a licensed electrician installed the unit.

Sizing Guide

Eltron 29 Plus is one of Stiebel’s most powerful tankless heaters. In warmer climates, it can supply hot water to four shower heads at the same time. The company claims the hot water supply is infinite. However, depending on the climate you’re in, the water pressure may vary. You can find their sizing guide here.

PROS:
  • The Advanced Flow Control feature
  • Two temperature memory settings
  • Compact design, easy to install

CONS:
  • The climate can determine water pressure
  • Warranty only covers part replacement

Sale
Stiebel Eltron 29 Plus Tempra, Tankless Water Heater, White
  • On demand a continuous and unlimited supply of hot water
  • Sleek design saves space and no venting required
  • Requires hard-wired 240 or 208-volt electric service, with a maximum draw of 28,800 watts at 240 volts or 21,600 watts at 208 volts
  • Requires 3 separate dedicated 40 amp breakers with 8 gauge copper wiring, and a minimum of 200 amp total service to the residence

Last update on 2019-07-18 at 22:09 / Affiliate links / Ratings / Images from Amazon Product Advertising API

To Conclude

So, now that you’ve seen what types of water heaters there are, how to do proper maintenance, and my top picks for the electric water heaters, only one question remains. Which of these will be crowned the electric tankless water heaters of all time?

I’ve given this decision a lot of thought, and my winner is the Rinnai RUC98iN. The reason I chose this one as the top electric tankless water heaters were mainly its hot water supply. It is the most reliable heater compared to all of the other heaters, and the warranty is pretty extensive. Moreover, it isn’t prone to corrosion or limescale buildup and requires little maintenance.


Have you ever thought that you need also to keep your home safe? Here are some great surveillance cameras that will make sure your safety is a priority: 5 of the Best 8 Channel Security System

  • Readers Rating
  • Rated 5 stars
    5 / 5 (3 )
  • Your Rating