Top 10 Best Electric Tankless Hot Water Heater in 2019 Reviews

When it comes time to replace your old, worn out hot water tank, why not consider a tankless hot water heater? Having hot water available for your laundering needs, showers, cooking and cleaning takes up a huge chunk of your energy budget every month. In fact, estimations show that most households spend up to 30 percent each month on energy required to just to heat their water. Standard, old fashioned tank style water heaters are large, bulky and work by storing and heating this water until it’s needed. Needless to say, keeping a large tank of hot water 24/7 is a massive waste of energy and money.

Top 10 Best Electric Tankless Hot Water Heater

Today, more and more people are searching for a better way, and that is the tankless hot water heater. These units are small, compact and easy to fit in any home or apartment. Tankless how water heaters function not by storing water in a tank, but heating it only on an as needed basis. This is why these heaters are referred to as ‘on demand’ hot water heaters.

Just this fact alone can save you up to 80 percent, depending on your personal hot water usage needs. This means that when placed side by side, the tankless hot water heater saves you much more in energy dollars than a standard tank heater.

Below we’ve compiled a list of some of the best tankless water heaters on the market. Each one has its perks and features which make it special. All are made by responsible and dependable manufacturers who stand behind their brand via warranties and excellent customer service. Whether you are searching for a portable model for your camping trip or vacation home, or a centralized unit which is permanently attached to your wall, delivering on demand hot water to your entire home, the tankless hot water heater is a superb choice for those looking to upgrade their current supply system.

Table of the best Electric Tankless Hot Water Heater:

1. EcoSmart ECO 11 Electric Tankless Water Heater

EcoSmart ECO 11 Electric Tankless Water Heater
Buy now from Amazon →
Save up to 60 percent with regards to your water heating costs with The 13Kw, EcoSmart ECO 11 Electric Tankless Water Heater, with heat exchangers that give you up to 99.8 percent energy efficient service. When you purchase an EcoSmart tankless water heater, you have to choose the model that is specifically designed for your area of the country, based on your climate.

This particular model has been already set for those of you who live where the water entering the tank will be 67 degrees Fahrenheit and over. Features of this 13kW, 240 volt, tankless water heater include the ability to heat 2 gallons of water per minute, digital temperature control, EcoSmart’s own, exclusive Self Modulating Technology, and automatic thermostat.

Designed for small home or apartment living, this unit supplies you with a consistent flow of hot water, on demand, when you need it.

2. Takagi T-KJr2-IN-NG Indoor Tankless Water Heater

Takagi T-KJr2-IN-NG Indoor Tankless Water Heater
Buy now from Amazon →

The Takagi T-KJr2-IN-NG Indoor Tankless Water Heater is easy to install, maintain, is powered on natural gas, and comes with its own convenient, remote control. This unit measures 6.7 x 13.8 x 20.3 inches, and weighs in at 38 pounds, so it is perfectly suited for residential units or small businesses with little space. Designed to work as hard as a standard, 40 gallon water tank, the Takagi is more than capable of providing you with a constant supply of hot water for your use, enough to service 2 bathrooms.

Easy to maintain, this unit offers trouble shooting diagnostic codes to assist you should anything occur. If you live in warm climates, it can handle 2 bathrooms, cold climates, one. Features include: An AFR or Air Fuel Ratio sensor, Energy Star certified, fully modulating, auto turnoff in case of overheating, freeze protection and surge protection.

Flow rate for this model is 6.6 GPM. So if you’re searching for an endless supply of hot water on demand, energy efficient tankless water heater which uses natural gas with no pilot light hassle, then the Takagi is a good choice for you.

3. Camplux 10L Outdoor Portable Tankless Water Heater

Camplux 10L Outdoor Portable Tankless Water Heater
Buy now from Amazon →

The Camplux 10 Liter Outdoor Portable Propane Gas Tankless Water Heater is just what you need for your outdoor recreational adventures. Have a handy supply of hot water when you need it for your vacation home, while camping, or for an outdoor garden shower by the pool or jacuzzi. This easy to install and maintain heater runs on propane gas, and at 12.9 x 8.3 x 21.6 inches and a light 18 pounds, is easy to fit in your recreational vehicle, car trunk, or camper.

This model is referred to as a ‘plug and play’ model, since hooking it up is as easy as 1-2-3, just plug and go, plus you have the ability to power it via battery, in case you’re camping off the grid. Features include a 2.64 gallon per minute capacity, winter and summer mode, anti-freezing protection, versatile shower head, auto-safety device, 11.5 percent Energy Saving Technology, and temperature control dial.

4. Eccotemp L10 Portable Outdoor Tankless Water Heater

Eccotemp L10 Portable Outdoor Tankless Water Heater
Buy now from Amazon →
The Ecotemp L10 Portable Outdoor Tankless Water Heater is the perfect solution to give your summer home, camper, cabin, trailer or recreational vehicle a nice supply of endless hot running water at 2.6 gallons per minute. This unit is so portable at 8 x 14 x 25.5 inches, and a light 27 pounds,that you can even use it for an outdoor shower near the pool or jacuzzi.

Water is heated using liquid propane, from 80 to 145 degrees Fahrenheit, with the unit only igniting when it senses water, which means your water will not arrive scalding hot. The ignition is powered by 2 ‘D’ batteries which means you are free to enjoy as many country back roads as you wish, and always have an endless supply of hot water whenever you want it.

Features include manual water temp control, 20 minute auto shutoff, 74,000 BTU, 20 to 80 psi water pressure, CSA certified gas regulator, rain cap, auto shutoff, and 20Kw heat input.

5. Eccotemp i12-NG Indoor tankless heater

Eccotemp i12-NG Indoor tankless heater
Buy now from Amazon →
If you live in a small home or apartment, you’ll find that the 16 x 16 x 11 inch,Ecotemp i12-NG indoor tankless hot water heater is not only a well-made unit, but it’s sleek, modern contemporary design will look rather nice in your utility room or basement. Packed with user friendly features such as automatic temperature controls, touch screen ability, and LED temp display.

The i12-NG is powered by natural gas, easily provides you with 0.6 to 4.8 gallons of water each minute, UL listed and gives you a 35 to 40 Fahrenheit temperature rise at 3 gallons per minute, and 77 degree rise when pulling in 1.5 gallons per minute.

Additional features include an electronic ignition system, gas and water controls, true 1/2 inch NPT water fittings, Child Lock Technology, and tempered glass front panel.

6. Rheem RTEX-13 Tankless Hot Water Heater

Rheem RTEX-13 Tankless Hot Water Heater
Buy now from Amazon →
The electric powered, 13Kw, self-modulating Rheem RTEX-13 belongs to Rheems Professional Classic Series of water heaters which give you a constant flow of hot water whenever you need it. Easy to install, this unit comes with a digital temperature display, external temperature control, and is 99.8 percent energy efficient, allowing you to save up to 50 percent on energy costs relating to hot water.

Features include enough hot water for 2 showers, provides 1.97 gallons per minute, minimum temperature of 80 degrees, and maximum hot temperature of 140 degrees Fahrenheit, easy to install and maintain. This indoor, residential type hot water heater is powered by electricity. This unit is UL, CSA and ETL listed.

7. Eccotemp FVI-12-LP Tankless Hot Water Heater

Eccotemp FVI-12-LP Tankless Hot Water Heater
Buy now from Amazon →
Measuring 4 x 15 x 24 inches, and weighting in at a light 20 pounds, the UL approved, Ecotemp FVI-12-LP Tankless liquid propane powered Hot Water Heater is designed for indoor residential use for small or medium sized households. Since it is designed to be compact, lightweight and propane powered, it’s also an excellent choice for your out of the way summer vacation home, trailer or camping trips.

You’ll get plenty of on demand hot water, as this unit will provide you with up to 4 gallons of hot water per minute. Its small, compact and contemporary design adds a touch of class to your utility room or basement.

Features of this unit include a digital temp display, true 1/2 inch NPT water fittings, water temp controls, electronic ignition system, energy factor of 79 percent, temperature and water flow adjustment, and only uses propane fuel when you request the hot water.

8. Rheem RTG-64XLP Tankless Hot Water Heater

Rheem RTG-64XLP Tankless Hot Water Heater
Buy now from Amazon →
The Rheem RTG-64XLP Outdoor Tankless Water Heater, is fueled by propane, designed for small to medium households, and features Next Generation Burner Technology. The RTG-64XLP also gives you the added convenience of the EZ-Link cable system.

This system means that you are able to hook up 2 tankless hot water heaters to work as one. This unit also comes with a UMC-117 remote, a Guardian OFW film wrap to prevent overheating, and third party certified by GAMA. Easy to install and maintain, it comes with its own self diagnostic program to help you uncover any issues which may arise.

Other features include a digital display, 120V power cord, freeze protection, and gives you a temperature range of 100 to 140 degrees Fahrenheit.

9. Stiebel Eltron Tempra 24 Plus Tankless Water Heater

Stiebel Eltron Tempra 24 Plus Tankless Water Heater
Buy now from Amazon →
The energy efficient, Tempra 24Kw Plus by Stiebel Eltron is a tankless hot water heater, which comes with Advanced Flow Control Technology, is self modulating and can provide you with up to 4.68 gallons of nice, hot water on demand every minute.

When you purchase a Stiebel Eltron unit, you’re getting over 90 years of precise tankless water heater technology in your home, as Stiebel invented this technology over 90 years ago, and they still manufacture some of the best tankless water heaters on the market.

This energy saving unit, is built for small to medium sized residences, and is able to supply 2 bathrooms with continuous hot water, while saving you up to 20 percent in hot water energy costs. Easy upkeep and easy to install, this unit requires no venting in order to be installed.

10. Takagi T-KJr2-IN-LP Tankless Hot Water Heater

Takagi T-KJr2-IN-LP Tankless Hot Water Heater
Buy now from Amazon →

This propane powered, indoor tankless water heater by Takagi, model T-KJr2-IN-LP has a maximum flow rate of 6.6 gallons per hour, enough to supply 2 showers. This compact and powerful unit can handle the same work as a 40 gallon standard tank water heater, has an energy factor of .83 with an electric ignition. This 140,000 BTU, direct vent unit measures a compact 6.7 x 13.8 x 20.3 inches, and weighs 38 pounds.

A handy, convenient easy to use remote control lets you have total control over the temperature of water from where you are. Features include freeze protection, stainless steel category III venting system, surge protection, and convenient diagnostic codes to help you if issues should arise.

How to Choose a Tankless Hot Water Heater:

Choosing the best tankless hot water heater for your needs is not difficult at all. In fact, it is quite a simple matter. All you need to do is to find out the size of the heater you’ll need, and whether you’d prefer one that is fueled by gas or electricity. Below we’ve outlined the basics, including how to calculate your households flow rate and temperature rise for yourself.

Point-of-Use or Centralized Installation

Once you begin to shop for your tankless hot water heater, you’ll notice that there is a huge variety of models on the market. This is due to the various uses people may have for a heater. For instance, if you are searching for a water heater for your vacation home, cabin or for an outdoor shower by the pool, a lightweight, small unit powered by propane or batteries will do, this is referred to as point-of-use installation.

If you require your entire home to be supplied with hot, on-demand water, then you’ll need a tankless water heater capable of delivering hot water to all the water fixtures in your home, this is called a centralized installation.

The Proper Size

It is imperative that before you start shopping for your tankless water heater, that you know the size you’ll need. This means that you’ll need to find out about how much water your household usually uses, then calculate the temperature rise. If you don’t perform this small, easy calculation, you could end up with a tank too small, which may mean a future of lukewarm showers on cold days.

To find the proper size for you, you’ll need to how your flow rate and temperature rise.

Your Flow Rate: Find out How Much Water You Use

This is the first step, and it’s also a very easy one. Simply write down each and every water fixture in your home. Next, take a look below and write the flow rate of each fixture. For instance, if you have 2 showers, flow rate would be 4, choosing 2 GPM for each shower.

Add up all your numbers for your very own GPM per day usage, so when you search for a heater, you can check to see if it can handle your households hot water requirements.

  • Washing machine: 1.5 to 3.0 GPM•Dishwasher: 1.0 to 2.5 GPM•Shower: 1.0 to 2.0 GPM
  • Kitchen faucet: 3.0 to 7.0 GPM•Bathroom faucet 0.5 to 1.5 GPM

Finding Your Temperature Rise

The easiest way to do this is to check your location on a chart which shows the average, groundwater temperature in your country. Next, take your ground water temperature you found on the chart, and your preferred hot water temperature, which most people choose as 120 degrees Fahrenheit, and find the difference between the two.

This is your temperature rise. For instance, if you look at the chart, and your ground water temperature is 60 degrees Fahrenheit, and your preferred hot water temperature is 120 degrees, subtract 60 from 120. Your temperature rise is 60 degrees Fahrenheit.

Preferred water temperature – average ground water temperature = Temperature rise

Ex: 120 – 60 = 60

So, once you’ve added up how many gallons per minute your household needs (flow rate), and know your temperature rise, you are now ready to begin to shop for your unit.

Gas or Electric

Both gas and electric tankless water heaters will do excellent work in reducing your monthly energy bill, and will more than pay for themselves over time. However, there are a few considerations regarding gas tankless water heaters that you may need to consider. Tankless water heaters which are powered by gas heat the water much more quickly than electric heaters.

Be mindful that when installing a gas fueled hot water heater, you’ll be required to install venting as well. if this is not an option, and you still prefer a gas powered heater, then consider purchasing an outdoor gas powered, tankless water heater, where it will be installed outside of the house, with no venting required. Also, to keep energy costs down, look for a gas powered heater with an electronic ignition instead of a pilot light.

Additional Features

Tankless hot water heaters are very basic in design. However, some do have additional features which may be an added selling point for you. First, a few models have a remote control. The remote allows you to have direct control over the temperature of your water from where you are, without having to go to the heater directly and use manual controls.

Another feature would be a heater which can be powered by batteries. This is useful if you are on the road quite a bit, love to camp out, or need a water heater by the pool. Other features you may find useful are LED display screens, touch screens, auto shutoff, or child lock technology.


When shopping for the Best Electric Tankless Hot Water Heater, it’s important to know exactly what you’ll need it for. This will require you to make an easy calculation of how much water your household uses on daily basis, plus your temperature rise. Once completed, you’ll be able to shop for a hot water heater the best suits your lifestyle.

Tankless hot water heaters may require a bit of an investment to install, but once installed, they will begin to pay for themselves in the cash saved by not having to constantly heat a full tank of water 24/7. By using a tankless water heater, you’ll have much more room, save valuable energy dollars, and have a low maintenance unit which is built to last, offering you many years of trouble free service.

Leave a Comment

Your email address will not be published. Required fields are marked *