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5 Electric Tankless Water Heaters to Save Your bathroom Space in 2019

Last Updated: 21 November 2019

The electric tankless water heater is a compact device brings cold water in through the dip tube and heats it using the electric heating elements inside of the tank. The water is not accumulated in the tank and not constantly heated, so there is no stand by energy loss.

Tankless heaters are long-lasting devices. Usually, they work up to 10 years with no repair. These devices take up less space and can be installed in small places, like under a cabinet in the kitchen. The amount of hot water is unlimited. Some models also include flood protection.

The main drawbacks are their cost and upgrades you may need to do to your venting system and natural gas line.

Why Do You Need It?

best electric tankless water heater
  • When hot water is needed constantly, for example, in public catering establishments in places for visitors, shopping centers;
  • If there is no time to wait for the water to heat;
  • In cases of extremely cheap or generally free electricity;
  • If there is a lack of space for a full-scale storage heater.
  • If you compare the tankless heater a conventional boiler, you will see that installing the electric tankless heater is much more profitable.
KITCHEN APPLIANCESItem DimensionsItem WeightPricePowerFeaturesSIZEFunctions
ECOSMART ECO 36 ELECTRIC17 x 19 x 3.8 inches18.35 pounds$$36 KW at 240 Volts150 AECOSMART tankless water heaters are 99.8-percent energy efficient
STIEBEL ELTRON TEMPRA PLUS 294.6 x 16.6 x 14.5 inches1 pounds$$$240 VRequires 3 separate dedicated 40 amp breakers with 8 gauge copper wiring, and a minimum of 200 amp total service to the residence120 А86°F - 140°F
RHEEM RTEX-134 x 9 x 13 inches4 pounds$$240 VSimple installation – 1/2 NPT adapters included; side 1/2 inch Compression water connections54 A
ECCOTEMP EM ELECTRIC MINI16.2 x 11 x 11 inches15.8 pounds$120 volts12 АECOSMART tankless water heaters are 99.8-percent energy efficient
MAREY ECO SMART8.7 x 3.5 x 14.2 inches10.1 pounds$220 voltsFlow switch activation mechanism allows the unit to produce constant temperatures with as little as

5 Best Electric Tankless Water Heaters Compared and Reviewed

1 place :

Best Overall: Ecosmart Eco 36 Electric

Best Overall: Ecosmart Eco 36 Electric

This is the most proven and reliable best rated electric tankless water heater. Its Self Modulating Technology and digital temperature control allow you to set temperature with the precision of 1 degree. It helps save up to 50% of your bill. This product is powerful and has one of the most impressive GPM flow rates. It can handle 6 gallons per minute, and it starts if the flow reaches 0.6 GPM with the ability to increase the temperature by 40F.

The series of EcoSmart ECO products are ideal for providing hot water to the whole house. This is the best electric heater for a large bath or Jacuzzi. Even for a public shower with several souls. In addition to excellent quality and power, this tankless electric water heating device has a stylish design. It will look organically anywhere.

Q: What yearly maintenance is required for this unit?

A: You need to install an inline filter and change out the cartridges every 3-6 months. This will prevent sediment build-up and damage to the heating elements.

Q: Since these units get pretty hot, do you need to install any thermal insulating backer board between the unit and the drywall?

A: No, the unit does not get hot, just the internals. They are not flush-mounted inside.

Q: Can this unit be mounted outdoors?

A: It is not recommended. The housing is metal and that would cause problems due to rust and there are no rubber gaskets in the housing to protect from moisture.

pros +

Compact and stylish highest GPM electric tankless water heater The most powerful on the market No mechanical switches 50 % energy efficient

cons -

More expensive than other models on the market

2 place :

For a Big House: Stiebel Eltron Tempra Plus 29

 For a Big House: Stiebel Eltron Tempra Plus 29

Stylish design, time-tested German quality – this brand does not need special representation. This water heater’s upgraded electronics and a hinged cover guarantee safety and durability.

This option is ideal for those who have a large house with several bathrooms. You can pick a temperature with a digital dial panel on its display. The sensor is simple and user-friendly. The range is 86 and 125f (30 and 52c). After you set a required temperature of the output, this unit calculates correctly the exact amount of energy for heating that amount of water.

You do not have to worry, and at the same time use a shower, dishwasher and other equipment - there will be no flow interruptions. This is the best whole house electric tankless water heater according to real users' reviews.

Q: Can I use 200v60hz three-phase? 208v or less can not be used?

A: It requires 2 independent 208 volts single-phase circuits (each independent circuit has 3 wires connected as Load 1, Load 2 and Neutral). Three-phase typically has 4 wires, with 1 being neutral / ground.

Q: I currently have 3 separate 40-amp breakers. Will this work with this model since it still adds up to 120, or does it HAVE to be 2 60-amps?

A: You need two 2-wire circuits, plus ground. So that means two 2-pole breakers, 60 amps each.

Q: Temperature 29, how many gallons per minute?

A: Whatever standard water pressure provides, approximately 2 -3 gallons.

pros +

A unique system for heating water at an economical cost German brands quality Stylish design

cons -

High cost compared to others Automatic control is not suitable for everyone

3 place :

For Small Houses: Rheem Rtex-13

For Small Houses: Rheem Rtex-13

The new model of its predecessor is 2708/5000 Rheem RTE 13, which is not inferior to it, but even better. If you are looking for an option for a small apartment or a house with one bathroom, then this suits you best. However, it is not a whole house electric tankless water heater.

The price of the Rheem electric tankless water heater is low, which will more than justify the cost of electricity. It is compact and does not take up much space. RTEX 13 has 2 copper heating elements that are durable. The water heater installation is simple. For this, 3-foot electric cable and 1/2 NPT adapters included. Digital thermo-control with an LED display offers you to set the temperature to provide 99.8% efficiency. It is shipped with saving shower head in the package.

Q: What are the wiring and power requirements ?

A: 60 amp breaker and , number 6 cable !

Q: Can this unit be installed lying down on its back, rather than hanging upright from a wall?

A: No it can’t.

Q: Which side is hot water?

A: The cold water inlet is on the right side, and the hot water outlet is on the left side.

pros +

Compactness Ideal for a small apartment or house High heating rate

cons -

Short time failures in the work in cold weather Not suitable for houses with two bathrooms.

4 place :

Most Compact: Eccotemp Em Electric Mini

Most Compact: Eccotemp Em Electric Mini

Compact, lightweight and easy-to-use device with 2 GPM capacity. The water is stored in a mini tank at the point where you use it – bathroom or kitchen faucet. Eccotemp offers devices for heating 2.5, 4 and 7 gallons at once.

The recovery time is 25-45 minutes. The water is supplied and heated from the mini-tank. If you read all electric tankless water heater reviews about this device, you see that it is a good option for those who want a simple and reliable device.

Installation is insanely simple. Just install the pressure relief valve, 2 connections, and plug it in. A floor and wall mount are in this kit.

Q: What amp breaker is required?

A: One 60amp double pole. Calls for number 6 wire, I used 8 and haven't any issues at all.

Q: My house is wired 110V. What additional items do I need to purchase for the conversion?

A: This unit will not operate on 110V. You will need a 220V service of about 60 Amps to run this heater.

Q: What yearly maintenance is required on this unit?

A: You need to install an in line filter, and change out the cartridges every 3-6 months...this will prevent sediment build up and damage to the heating elements.

pros +

Compact with a mini tank Simple installation

cons -

Needs 25-45 of recovery time

5 place :

Good Quality of Material: Marey Eco Smart

Good Quality of Material: Marey Eco Smart

The next position in our list is Marey ECO that is ETL approved. This variant is for those who want to enjoy the hot water without interruption and save money.

This compact best electric tankless water heater allows you to program the desired temperature of water with its smart technology. You can change settings on the easy-to-understand LCD panel.

Marey Eco has a patented in Germany heating element with a water channel made of stainless steel. This guarantees the duration and quality of its operation. This unit is enough for two showers and the hot water supply starts immediately after the opening of the tap.

Q: What size is the out put line?

A: Both water inlet and outlet connections are 1/2" NPT.

Q: What is the fitting for the pvc inlet and outlet?

A: PVC should not be used for the hot water connection. Instead use copper, CPVC, or other high-temperature rated pipe.

Q: Can it be used for a shower.

A: Yes, it can be used for a shower.

pros +

Water heating channel made of stainless steel Quality and compactness Economical work Low price

cons -

The installation is possible only with the help of a plumber It takes a place because it is fixed vertically and on a wall

6 place :

Infrared Technology: Sio Green ir260 Pou Electric

Infrared Technology: Sio Green ir260 Pou Electric

Simple innovative design and ergonomic size allow installing this unit almost everywhere. This best electric tankless hot water heater creates heat with no direct contact with metals. This prevents limescale deposit, corrosion and calcium buildup. As a result, you save on maintenance and filters. The instant infrared heating unit uses 110 volts. It warms ONLY the water you use with high temp, thus allowing you to save time and money! Set up the power levels and adjust the temperature with a Flow regulator that is shipped along.

Also, there is a trial period of 30 days. If you are not happy with your device after a month, the manufacturer will offer you a replacement or a refund.

pros +

Infrared technology for fuelless water heating Stylish design Practicality Longevity of operation without scale, thanks to a non-metallic body

cons -

The strength of the work is not so great as that of other devices of this category on the market Expensive for some users

Types of Electric Tankless Water heaters

Types of Electric Tankless Water heaters

Such devices comes in two types – point-of-use and whole-house.

Point-of-use systems are compact and supply 1 or 2 taps. Because of the ergonomic size, you can easily install these systems under a sink or under a cabinet. They help avoid loss of energy that appears with lag time. It’s a time that passes till flow gets from a tank to a faucet. This point can be significant in large houses.

Whole-house devices are larger, cost more and can supply more than one outlet at a time.

You can choose from propane, electric or natural gas units.

Point-of-use models are usually electric, while whole-house ones are powered by natural gas or propane. The choice will depend on a few factors.

In the next section, we’ll look closer at factors, so you can make an informed decision when it comes time to purchase your electric or propane tankless water heater.

Electric Water Heater Buying Guide – What to Look At?

The main factor is productivity. For example, for washing hands, 3 liters per minute are enough; to wash the dishes you need about five and taking a shower will require as much as 8 liters per minute. Comfort temperature can also vary. The final consumption of electricity depends on this. So, first, determine what the device is intended to be used for. You can also build on the power you need. To do this, you still need to know the performance of hot water and multiply its value by 2. The choice of electric tankless hot water heater in terms of power is good because you can estimate the electricity consumption for heating. In addition, you need to pay attention to additional functions:

Electric Water Heater Buying Guide
  • Protection against overheating of the heater;
  • A fuse against voltage surges;
  • Automatic deactivator when the water supply stops;
  • The valve from a sudden increase in pressure;
  • The light indicator of the activity;
  • A filter protecting the heater from plaque and sediment.

The wider the functionality of the best electric tankless water heater, the higher its cost. The assembly of the unit is also important. The delivery set should include all necessary pipes, fittings, plugs, showerheads, mixers or funnels. Only so the manufacturer can guarantee the quality of installation and the normal operation of the tankless water heater. This will also affect the price toward increasing. Here, it is worth overpaying a little and get a quality, reliable and durable product.

Best Electric Tankless Water Heater in 2019: Final Advice

Best Electric Tankless Water Heater

We give our preference to the Ecosmart ECO 36. We define it as the best electric tankless water heater because of its power, stylish design, and compactness. Unlike Stiebel Eltron Tempra Plus 29 or Rheem RTEX-13 which are suitable only for the big or small house, this device can be installed in any place. In addition, the installation doesn’t require the help of a plumber. Reviews of hundreds of real users also prove that fact.

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