Traditional hot water tanks are usually the biggest drain on electricity in a residence. Keeping dozens of gallons of water hot 24 hours a day requires an enormous amount of energy. Today families are exploring options like electric tankless water heaters to reduce their energy consumption. With so many electric tankless hot water heaters on the market today the choices can be overwhelming. We've taken the guesswork out of choosing the right electric tankless water heater for your application by reviewing the top products available today.


Product FAQ

1. WHAT ARE ELECTRIC TANKLESS WATER HEATERS?

2. HOW DO ELECTRIC TANKLESS WATER HEATERS WORK?

3. WHERE CAN YOU BUY ELECTRIC TANKLESS WATER HEATERS?


How We Reviewed

The following products were reviewed based on the following parameters: Features, Pros & Cons, Price, Where to Buy, and Warranty. 

 

Overall Price Range of Electric Tankless Water Heaters

electric tankless water heaters

Pricing for electric tankless water heaters varies widely. The prices for the electric tankless water heaters reviewed in this article vary depending on the features each of them has to offer..

 

What We Reviewed

  • EcoSmart ECO 27 Electric Tankless Water Heater
  • 18kW / 240V Electric Tankless Water Heater
  • Marey ECO180 18kW 4.4 gpm 220V Self-Modulating Multiple Points of Use Tankless Electric Water Heater
  • Rheem RTE 13 Electric Tankless Water Heater
  • Stiebel Eltron 231045 Mini 2 Point of Use Tankless Electric Water Heater
  • Eccotemp EM-2.5 Electric 2.5-Gallon Mini Tank Water Heater
  • 2.3 GPM Electric Tankless Water Heater
  • Bosch Electric Tankless Water Heater
  • Stiebel Eltron Tempra Plus 29 kW, tankless electric water heater
  • Ariston GL4S Electric Mini-Tank Water Heater

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

FEATURES 

This model, with patented self modulating technology, is one of the largest electric tankless water heaters available. It is well suited to use in the northern United States where incoming water temperature can be as low as 37 degrees. The unit can heat almost three gallons per minute at low temperature. It will support up to two simultaneous showers with an ample water supply. In the southern United States the unit will support a high demand of water for multiple applications.


WARRANTY 

This product carries a limited lifetime warranty from the manufacturer.

pros

  • One of the largest heaters available  
  • Supplies up to six gallons per minute
  • Thermostat ranges 80 to 140 degrees

Cons

  • Difficult to install
  • Lights flicker when in use

Sale
Atmor AT-910-27TP ThermoPro 27kW/240V Electric Tankless Water Heater,...
  • Digital temperature control allows you to set your temperature in increments of 1 degree. Thermostatic control range from 90-135 degrees
  • Electrical requirements: three 40amp single-phase DP breakers, 3 x 8 AWG wires, 240V. 113a total connected load
  • Specially equipped to heat incoming water as low as 37 degrees at 2.2 gpm

FEATURES 

This electric tankless water heater features smart flow technology with an advanced self modulating system that regulates water flow and the amount of energy necessary to heat water. It has a digital panel that allows the user to control water temperature. The unit requires no venting and can be installed anywhere. The interior assembly is made of durable, corrosion resistant stainless steel that heats efficiently and has a long life expectancy. This unit is designed for moderate to warm climates. The 3.7 gpm capacity is ideal for an apartment or small home.


WARRANTY 

Warranty information is available from customer service.


pros

  • Space saving design    
  • Stainless steel interior assembly
  • Digital control panel

Cons

  • Does not include required pressure relief device
  • Flow sensors may leak
  • Causes light to flicker when in use

Sale
Marey ECO180 18kW 4.4 gpm 220V Self-Modulating Multiple Points of Use...
  • The 220V eco 18Kw unit requires (2) 50 amp breakers and must be installed by a professional plumber or electrician to ensure safety and quality
  • German-designed with high quality stainless steel water channel and heating chamber
  • Smart technology: easy management and simple adjustments on a LCD panel allows you to program the exact desired water temperature thereby optimizing electricity consumption

FEATURES 

This electric tankless water heater is the only model on the market that does not accumulate sediments because the water never touches the heating element. The unit provides 18kW of power making it the perfect solution for up to three points of use in the southern US. It provides a 36 degree increase at 4 gpm. In northern climates that translates to heating water up to 80 degrees at 1.5 gpm for one point of use.


WARRANTY 

Warranty information is available from customer service.

pros

  • Does not accumulate sediment          
  • Up to three simultaneous points of use in southern US
  • Corrosion resistant heating elements

Cons

  • Extremely limited output
  • Water temperature fluctuates
  • Poor customer service

Rheem RTE 13 Electric Tankless Water Heater, 4 GPM
  • On-unit temperature control, LEDs indicate active element and standby mode
  • Standard 1/2" water connection
  • Rugged brass/copper heat exchanger

FEATURES 

This unit is ideal for point of use applications. The temperature control LEDs on the unit indicate "Active Element" and "Standby" modes. The unit uses a standard 1/2" connection. The heat exchanger is made of rugged brass and copper. It has a maximum flow rate of 4 gpm and will support simultaneous use at multiple outputs. The unit carries a one-year warranty on parts and a ten-year warranty on the heat exchanger. The unit must be installed by a licensed technician to validate the warranty.


WARRANTY 

This product carries a one-year limited warranty on parts and a ten-year limited warranty on the heat exchanger.

pros

  • Flow rate supports multiple output points  
  • Brass and copper heat exchanger
  • Standard 1/2" water connection

Cons

  • Not for use in cold climates
  • Water temperatures fluctuate
  • Water flow rate inaccurate

Sale
Stiebel Eltron 231045 Mini 2 Point of Use Tankless Electric Water...
  • Extremely compact design saves space
  • Sleek design is appealing and can be mounted in plain sight
  • Minimum flow to activate unit: 0.21 GPM 0.8 l/min and internally restricted to 0.32 GPM

FEATURES 

Stiebel Eltron invented tankless water heater technology. These units heat limitless water instantly with 99% efficiency and no standby energy losses. The Mini models are categorized based on flow rate. The temperature of heated water depends on the temperature of the incoming water, the flow rate, and the size of the unit installed. The heater must be carefully matched to the application for optimal functionality.


WARRANTY 

Warranty information is available by contacting customer service.

pros

  • Attractive design can be installed in full view     
  • Doesn't require venting
  • Industry leading manufacturer

Cons

  • Low water flow
  • Inconsistent temperature
  • No LED display

Sale
Eccotemp EM-2.5 Electric 2.5-Gallon Mini Tank Water Heater
  • Compact design fits virtually anywhere, easy and ready to install
  • Adjustable temperature control 50 Degree-140 Degree
  • Temperature/Pressure relief valve included

FEATURES 

This heater efficiently delivers hot water by heating the water at the point of use. It saves water because you don't have to run the water waiting for it to heat up. The compact design is floor and wall mountable, and the compact design fits virtually anywhere. The unit is easy to install and has a pressure relief valve included. The temperature control adjusts between 50 and 140 degrees.


WARRANTY 

This product carries a two-year limited warranty from the manufacturer.

pros

  • Floor and wall mountable 
  • Pressure relief valve included
  • Temperature adjusts between 50 and 140 degrees

Cons

  • No drain--must be uninstalled and tipped upside down
  • Poor customer service
  • Many DOA units

2.3 GPM Electric Tankless Water Heater. IHEAT S-12 replaces Model...
  • iHeat S series is a lead free certified product. Manufactured in complete stainless steel.
  • Maximum current 240V: 56 Amps. Require Breaker 1x60 Amps Double-Pole. And Wire Gauge: 1 x #6AWG
  • Advanced Power Modulation through Micro-Processor. Complies with USA & Canadian Safety Standards

FEATURES 

This heater efficiently delivers hot water by heating the water at the point of use. It saves water because you don't have to run the water waiting for it to heat up. The compact design is floor and wall mountable, and the compact design fits virtually anywhere. The unit is easy to install and has a pressure relief valve included. The temperature control adjusts between 50 and 140 degrees.


WARRANTY 

The unit carries a three-year warranty on the internal electrical components and a five-year limited warranty on damage due to leaks.

pros

  • Heating capacity of 3.5 gpm  
  • Stainless steel construction
  • Can be used in sterile applications

Cons

  • Water temperature fluctuates
  • Draws a lot of power 
  • Poor customer service

Bosch Electric Tankless Water Heater - Eliminate Time for Hot Water -...
  • CONVENIENT TANKLESS HOT WATER HEATER: 26.9 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

FEATURES 

These electric tankless water heaters can be installed virtually anywhere inside. They save space because they don't have a storage tank. These electric tankless water heaters have an average life expectancy of 20+ years because they don't corrode like a traditional tank heater. The units are equipped with an electronic flow sensor and element modulation to maintain a consistent output temperature. Scale prevention technology allows the user to monitor temperature stability and control.


WARRANTY 

This product carries a five-year limited warranty on the heat exchanger and a two-year limited warranty on the other components.

pros

  • Life expectancy of 20+ years 
  • Electronic flow sensor
  • Scale prevention technology

Cons

  • Requires 40 amp circuit
  • Requires high water volume to activate heater
  • Can't be installed on aluminum wiring

Sale
Stiebel Eltron Tempra Plus 29 kW, tankless electric water heater with...
  • Proven reliability
  • No venting required
  • Sleek design fits anywhere

FEATURES 

These electric tankless water heaters are the most technologically advanced units available on the market today. They have been completely redesigned inside and out. They have upgraded heavy duty electronics, a single flow sensor design, a hinged cover for easy access, and advanced flow control. These heaters are less expensive and easier to install than similar gas tankless heaters. No venting is necessary. These units feature a digital temperature display and dial selector that allows the user to set the desired water temperature anywhere between 86 and 125 degrees.


WARRANTY 

This product carries a seven-year limited warranty against leaks and a three-year limited warranty on materials and craftsmanship.

pros

  • Single flow sensor design    
  • Hinged cover for easy access
  • Digital temperature display

Cons

  • Requires 2-50 amp circuits to operate
  • Reduces water flow too far for simultaneous operation
  • Heats water slowly

ARISTON GL4S ELECTRIC MINI-TANK WATER HEATERB0006GVO1C


Ariston GL4S Electric Mini-Tank Water Heater
  • Point-of-use 4-gallon mini-tank water heater
  • Provides instant hot water for your sink's faucet
  • No hard wiring needed, simply plug into an outlet; installs independently or with a larger water-heating source

FEATURES 

These point of use electric tankless water heaters keep four gallons of hot water ready and only draw 12.5 amps. Installation is easy and involves tapping into the cold water line and installing the unit directly under the sink. It plugs into a standard 120 volt outlet. Upgrades to previous models include a new thermostat knob on the front of the unit to adjust water temperature between 65 and 145 degrees.


WARRANTY 

This unit carries a manufacturer's 6-year limited warranty for the heat exchanger and a 1-year limited warranty for parts.

pros

  • Plugs into standard 110v outlet
  • Glass lined storage tank maintains four gallons of hot water
  • Thermostat knob on front of unit for easy adjustment of water temperature

Cons

  • Requires dielectric water connections
  • Anode rod must be replaced every 6-9 months
  • No drain for winterizing

The Verdict

Based on our research we believe the best electric tankless water heater is the Stiebel Eltron Tempra Plus 29 kW, tankless electric water heater. The heavy duty electronics and hinged cover make this unit easy to use and maintain. It is powerful enough to use a single unit for multiple applications and the flow control feature will ensure constant water temperature. This unit has a hefty price tag, but the reviews indicate this product is worth the money.

Pin It on Pinterest

Share This