Best Electric Tankless Water Heaters Reviewed

Hot water isn’t a luxury, it’s a necessity. Furthermore, it is very important to have a system that can fulfill your needs. For this reason, it’s essential to find a device that is efficient, eco-friendly, and cost-effective and that provides you with continuous hot water.

Electric tankless water heaters are the new go-to for homes, businesses, and anywhere else that needs hot water on demand. An instantaneous electric water heater will provide you with hot water in a matter of seconds after you turn on the faucet. Rather than heating water ahead of time and storing it in a tank, it uses electricity to warm the water at the moment you need it.

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A whole-house electric tankless water heater is perfect for a small home. Average-size homes can also benefit from electric water heaters, although point-of-use units for single appliances are more appropriate. For large homes that require a greater amount of hot water on a regular basis, it can be more efficient to get a gas-powered tankless water heater.

With all of the different models and specifications out there, you’re probably wondering what is the best electric tankless water heater. Without further ado, let’s review the top tankless electric water heaters on the market. 

Overall Best Electric On Demand Water Heaters

  • 4.0 GPM
  • 43 F Temperature Rise
  • Suitable for Whole House
  • 4.3 GPM
  • 43 F Temperature Rise
  • Suitable for Whole House
  • 4.3 GPM
  • 43 F Temperature Rise
  • Suitable for Whole House
  • 1.7 GPM
  • 40 F Temperature Rise
  • Suitable for Point of Use
  • 2.4 GPM
  • 43 F Temperature Rise
  • Suitable for Point of Use
  • 3.0 GPM
  • 41 F Temperature Rise
  • Suitable for Point of Use

Top-Rated Electric Tankless Heater Picks Reviewed

Below, we go into detail about each of the top electric tankless hot water heaters for both whole house and point of use. You can also see our review chart above which compares these top models side-by-side to determine which product is best for your home water needs.

Best Whole House Electric Tankless Water Heater Reviews

1. Stiebel Eltron Tempra Plus

Innovation and design are part of what makes Stiebel Eltron water heaters great for any home. A world leader in hot water technology, the company has been committed to saving homeowners money with their electric water heating technology for over 90 years.

This whole-house on-demand electric water heater is particularly superb. For one thing, it runs totally silently. For another, it has advanced flow control to ensure that your water always stays hot while you’re showering or doing laundry.

With the Stiebel Eltron Tempra Plus, you can control the temperature of your water with just a click of a button, thanks to the digital temperature control. Plus, the sleek appearance means that you can place it anywhere in your home. It is a great option for busy families who need to use multiple showers of other appliances that require hot water at the same time. Since it keeps a constant temperature, no one will ever experience a sudden burst of cold water.

This Stiebel Eltron electric tankless heater has a 7-year leakage and 3-year parts complete warranty.


    • No reduction in flow, regardless of how much water is running
    • High-quality unit
    • Installation is fairly simple for someone with experience
    • The 24 Plus model can heat enough water for two showers at once — it is great for most homes with average water demands and medium to high incoming water temperature
    • The 36 Plus model is suitable for larger homes as a whole house unit and for colder incoming water temperature


    • You may find that it’s unable to heat water sufficiently if temperatures are below as freezing outside

2. Eemax EEM24027

Eemax has been a top supplier of tankless water heater solutions for more than 25 years, supplying water heaters to all types of homes and commercial businesses. Use their green solutions in your home to save money while still heating up plenty of water whenever you need it.

The EEM24027 is smart, with self-modulating technology available to adjust energy usage according to how much hot water you need. You can install the heater anywhere in your house due to its small size. It comes with a warranty of five years for leaks and one year for parts.


    • Up and running in just a few hours
    • Continues to give you hot water even with multiple appliances running
    • Suitable for large homes


    • You will need professional help to install it

3. EcoSmart ECO

The EcoSmart ECO-heater is a strong contender for best whole-house electric tankless water heater. Cutting your water heating costs by up to 50 percent, this heater is designed to save you space, effort, and worry.

Make use of the digital temperature control to instantly change your water temperature in 1-degree increments. We personally love the copper and stainless components, which make the heater extra durable.

EcoSmart is a great option for green homes and for saving money. If you have a smaller home, you’ll appreciate how much storage space you’ll gain from switching from a tank water heater to this instantaneous hot water heater. Electric powered, it can still provide up to 6 gallons of water per minute (GPM), which is ideal for people living in the Northern United States.


    • Can provide hot water to up to three showers at once
    • Provides consistent and visible savings for most users
    • Fairly easy to install


    • You cannot set the water temperature above 105 degrees Fahrenheit

Best Point of Use Tankless Electric Models

1. Sio Green IR288

This electric tankless water heater — 110v isn’t made with any metallic elements, eliminating the possibility of corrosion and saving you money on maintenance. If you’d like to just install your water heater and forget about it, this is one of the best options out there.

In addition, it’s less than 20 inches in length, you can set it to one of four power levels, and it can power any appliance in any home. This small tankless water heater comes with a 5-year warranty.


    • If you’re showering one at a time, the temperature will always stay consistent
    • Perfect for a small house or condo
    • Easy to install, especially since it barely takes up any space


    • Not designed for extremely cold areas, for heating multiple appliances at once, or as a whole-house device

2. Stiebel Eltron Tempra 15

Stiebel Eltron not only makes whole-house water heaters, but the company also manufacturers point-of-use models for individual appliances or areas in the home. The simple design means that it is easy to install and use.

The advanced flow control technology provides you with a constant source of hot water at the quantity you need. Plus, with 99 percent energy efficiency, you’ll definitely save money changing from a tank storage heater. Adjusting the temperature according to the season is easy, as the unit comes with a digital temperature display. It has 7-year leakage and 3-year parts complete warranty.


    • Can provide enough hot water for two low-flow showers or three faucets at the same time
    • No reduction in flow regardless of how many appliances you’re running
    • Your electric bill will decrease


    • May be less effective in extremely cold regions

3. Rheem RTEX-18

Check out the Rheem RTEX-18 to see a modern external digital thermostatic control on an LED display. It’s made to be incredibly accurate, allowing you to adjust the temperature on your own whenever you’d like.

If you’d prefer to just leave it alone, the unit will work using self-modulation, adjusting the power to meet your hot water demand. You will never waste any energy. Better still, this unit won’t take up your time on a hugely complicated installation either.

The Rheem RTEX-18 water heater has a warranty of six years. Some other heaters from Rheem have longer warranties, but they are more expensive to purchase.


    • Responds to new settings immediately
    • Runs totally silently
    • Numerous possible settings


    • May be less effective in extremely cold regions

What Are Electric Tankless Water Heaters?

An electric tankless hot water heater provides you with an instant supply of hot water anywhere in your home for showers, sinks, washing machines, and dishwashers. It does this by using an electrical element to directly heat the water. When you turn on a faucet for hot water, cold water enters the unit. The heater warms this water in a matter of seconds and sends it directly to the open faucet. The result is hot water for as long as you need it. In contrast, storage water heaters preheat a limited amount of water and hold it in a tank.

gas vs electric fuel

Benefits of Electric Tankless Water Heaters

Switching to an electric tankless water heater comes with many benefits, both for your family and for the environment. Here are some of the advantages of choosing an electric tankless water heater over traditional units.

You’ll Have a Constant Supply of Hot Water

If you have a large household, you know how limited hot water can be. Between laundry, dishes, and showers, you might be bathing in cold water if you’re the last one in line. When you’re using a storage tank water heater, you’re only going to receive as much hot water as the tank can store. With top-rated tankless water heaters, there’s no waiting for more water to heat up. Once you turn on the hot water, cold water is instantly heated and ready to go for as long as you need it.

Provided you pick the right size instant hot water heater, electric tankless models can ensure that you never run out of hot water. For instance, with a wall-mounted electric water heater that has a high GPM, you can do a load of laundry using hot water while taking a shower. You’ll never have to ration hot water again.

water flowing from shower head

They’re Small & Compact

Most of the models featured in our electric on-demand water heater reviews are very small. This means you can install them just about anywhere. Since they lack a bulky tank, these units can save you a ton of space.

Whereas traditional water heaters can be about the size of a person and hold about 40 to 60 gallons of water, electric tankless water heaters are as small as 10 inches high and 7 inches wide — small enough to be placed under cabinets. This makes them ideal for even condos. You can even discreetly tuck yours away to free up room for other things.

Rheem RTEX 13

They Save You Money

Since electric tankless water heaters require very little energy to function and don’t rely on standby energy, they can save you an average of 15 percent on your water heating energy expenses. That can be at least $100 saved on utility costs every year. Traditional units use energy just by sitting idle, but the electric tankless water heaters only use energy when you need hot water. Plus, even when they are heating water, they’re specifically designed to run on 10 to 50 percent less energy than traditional units, which leads to even more savings for you. This is especially important when you consider that around 20 percent of your home’s energy costs come from heating water.

Another way the models featured in our electric on-demand water heater reviews will save you money is that they don’t require as much maintenance as standard tank water heaters. Tank water heaters use an anode rod to prevent corrosion to the tank. You must replace this rod regularly, which costs both time and money.

water flowing from shower head

They Last Longer

The best electric tankless water heater has a much longer lifespan than any tank model. On average, a decent storage tank water heater will last for no more than 10 years before you need to replace it. Top tankless models last for at least 20 years.

This is especially important if you have a large household using a lot of hot water on a daily basis. Heating water for showers, sinks, a dishwasher, and a washing machine can take a toll on your water heater over time.

Rheem RTEX 13

The Value of Your Home Will Increase

Eco-friendly, sustainable living is becoming is a major trend these days. Home buyers actively look for homes that already have green features because they know these will have lower utility bills. Therefore, besides enjoying the benefits of a tankless water heater while you live in your home, you’ll be increasing the value of your home should you decide to sell it one day. It will also be more attractive to potential buyers.

water flowing from shower head

They Provide Cleaner Water

Storage heaters sometimes hold the same water in a tank for long periods. During the time this water is sitting in the tank, it can become contaminated with rust and sediment that has built up in the tank.

Rheem RTEX 13

When Electric is The Right Choice Compared to Gas

Gas water heaters use a natural energy resource, which makes them about $10 to $15 cheaper to run each month than electric models. However, there are still some advantages that come from electric water heaters that make them a better choice in certain situations.

Here are a few things to consider when you’re are comparing the two options to make sure electric is the better choice for you.

You’re Worried About Safety

Just like with gas stoves, you must always be aware of the dangers that come with gas-powered water heaters. A small gas leak can easily go unnoticed, but it is very dangerous for your family. For this reason, electric is a safer option than gas. Since electric water heaters don’t use any form of combustion, you have no need to worry about gas leaks. Even an outdoor electric tankless water heater is generally more reliable than an outdoor gas unit.

Rheem RTEX 13

Electric Tankless Water Heater Prices

Electric water heaters are less expensive than gas models — although the fuel to run a gas water heater is a bit cheaper. When replacing a tank water heater, an electric unit will save you a lot of money on the upfront purchase. In addition to the less expensive unit, installation fees for electric tankless water heaters tend to be much cheaper (not to mention easier to install) as well.

You Want the Freedom to Disconnect

Electric water heaters can be powered with solar energy using the panels on your house. If you would rather not rely on an electrical connection or gas line for your insta hot water heater, electric is the way to go. For the same reason, electric tankless water heaters are excellent for RVs and mobile homes.

Rheem RTEX 13

You Want to Store the Water Heater Indoors

Gas water heaters either require ventilation or need to be installed outside. Many electric water heaters models are available as both indoor and outdoor units. Furthermore, the ventilation is expensive to install and can require a building permit.

How to Select the Right Size Electric Tankless Water Heater

Once you’ve decided to go with an electric tankless water heater, it’s important to choose the right one. You’ll come across many different ones while you’re shopping, and an important thing to consider is what size you need. Here are the basic factors to keep in mind to ensure you choose the correct size:

1. Determine where you will use the tankless electric heater

2. Determine what GPM is needed where you are using the heater

2. Determine your temperature rise needed from your incoming water supply

For a step-by-step guide on how to choose the correct size water heater, check out our guide here.

On-Demand Electric Water Heater FAQs

Are there any extra steps I can take to get the most out of my tankless electric water heater?

There are a few different things you can do to make sure you’re really taking advantage of the benefits and savings that come from purchasing an electric tankless water heater. For example:

  • Limit your water consumption: Reducing the amount of water that your household uses at one time can help decrease your GPM requirements and allow you to efficiently use a smaller size unit.  
  • Lower the thermostat: Typically, your tankless water heater will come pre-set to 140 degrees Fahrenheit. This is actually much hotter than a normal household would need. You can lower the temperature by about 20 to 30 degrees Fahrenheit. Lowering the temperature also helps you use less energy and prevents excessive sediment buildup inside of the water heater.

Do tankless electric water heaters require any regular maintenance?

Tankless electric water heaters don’t require much maintenance at all. The only thing you will need to do is clean your heater of limescale once a year. If the buildup becomes excessive, it can cause the water heater to stop operating as efficiently and the limescale could corrode the heating surface. Your tankless water heater will most likely come with a step-by-step manual that will instruct you on how to properly purge the unit. Before attempting to clean it, be sure to take all the proper safety precautions, such as shutting off the power source and turning off all three water valves.

Purchasing Your Electric Tankless Water Heater

It’s impossible to live without a water heater. You can’t shower, wash the dishes, or do laundry. But sticking with a tank water heater wastes money — it heats a massive amount of water at once and keeps the water stored sometimes for many hours. A much better option is an electric tankless water heater.

Any of these models are great choices, but the Stiebel Eltron Tempra Plus is our top pick. This small unit has a lot of power and, although it may have to struggle to perform optimally in colder areas, the water fluctuation and temperature will remain consistent. Stiebel Eltron also carries a more powerful model of this same version (the 36 Plus), for if you need a higher GPM for your home. 

Lastly, if you still want to review all of our top picks, see our tankless water heater reviews page here.

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