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Tankless Electric Water Heater Comparison - April 2026
| 1 Best Choice  9.8Exceptional | 2  9.7Exceptional | 3  9.6Exceptional | 4  9.4Excellent | 5 Best Value  9.3Excellent | 6  9.2Excellent |
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ModelRheem 18kW 240V Tankless Electric Water Heater, Gray | Model EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology | Model Electric Tankless Water Heater WINTEMP 27kW 240V, Whole House Hot Water Supply, On Demand Instant Endless Water Heater, with LED Temperature Display, WiFi Control, Up to 6.3 GPM, ETL Certified | Model Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY | Model Rheem 11kW 240V Tankless Electric Water Heater | Model Rheem 6.5kW 240V Point of Use Thermostatic Tankless Electric Water Heater |
BrandRheem | Brand EcoSmart | Brand WINTEMP | Brand Rheem | Brand Rheem | Brand Rheem |
Reviews | Reviews | Reviews | Reviews  | Reviews | Reviews |
Features | |||||
Easy installation 8.6 | Easy installation  9.1 | Easy installation 8.9 | Easy installation 9.1 | Easy installation 7.2 | Easy installation 7.0 |
Efficient energy use 8.6 | Efficient energy use 9.3 | Efficient energy use 9.1 | Efficient energy use 9.1 | Efficient energy use 9.6 | Efficient energy use 9.1 |
Temperature control 8.6 | Temperature control 8.9 | Temperature control 8.6 | Temperature control 8.9 | Temperature control 8.6 | Temperature control 7.9 |
Worth the money 7.9 | Worth the money 8.9 | Worth the money 7.7 | Worth the money 8.6 | Worth the money 8.4 | Worth the money 7.6 |
Tech Specs | |||||
heat output18 Kilowatts | heat output 11 Kilowatts | heat output 27 Kilowatts | heat output 13 Kilowatts | heat output 11 Kilowatts | heat output 105 Degrees Fahrenheit |
is electricYes | is electric Yes | is electric Yes | is electric Yes | is electric Yes | is electric Yes |
maximum flow rate4.4 Gallons Per Minute | maximum flow rate 3.1 Gallons Per Minute | maximum flow rate 6.5 Gallons Per Minute | maximum flow rate 4.8 Gallons Per Minute | maximum flow rate 2.68 Gallons Per Minute | maximum flow rate 1.5 Gallons Per Minute |
colorGray | color White | color Gray | color Gray | color Gray | color Gray |
included componentsFittings, Aerators | included components electric tankless water heater | included components Operation and Installation instructions, Rubber plug and screw, tankless water heater | included components Rheem RTEX-13 Residential Tankless Water Heater | included components Fittings, Aerators | included components RTEX-06T Tankless Electric Water Heater |
wattage18000 watts | wattage 13000 watts | wattage 27000 watts | wattage 13 KW | wattage 11 KW | wattage 6500 watts |
product dimensions14.5"W x 18.25"H | product dimensions 8"W x 11.5"H | product dimensions 11W x 19.1H | product dimensions 8.25"W x 12.62"H | product dimensions 8.25"W x 12.63"H | product dimensions 10.88W x 5.88H |
item weight14.78 pounds | item weight 6.5 pounds | item weight 12.7 pounds | item weight 3.96 pounds | item weight 7.04 pounds | item weight 4 pounds |
special featuresLED Display | special features LED Display | special features Overheat Protection, LED Display | special features LED Display | special features LED Display | special features Tankless, Thermostatic Control, Compact and Wall-Mountable |
voltage240 Volts | voltage 220 Volts | voltage 240 Volts AC | voltage 240 Volts | voltage 240 Volts | voltage 240 Volts |
item package quantity1 | item package quantity 1 | item package quantity 1 | item package quantity 1 | item package quantity 1 | item package quantity 1 |
mounting typeWall | mounting type Wall | mounting type Wall | mounting type Wall | mounting type Wall | mounting type Wall |
batteries includedNo | batteries included No | batteries included No | batteries included No | batteries included No | batteries included - |
maximum temperature140 Degrees Fahrenheit | maximum temperature 140 Degrees Fahrenheit | maximum temperature 140 Degrees Fahrenheit | maximum temperature 1.4E+2 Degrees Fahrenheit | maximum temperature - | maximum temperature 140 Degrees Fahrenheit |
efficiency99.8% | efficiency 99.8 % | efficiency High Efficiency | efficiency at least 99.8% energy efficient | efficiency 99.8% | efficiency - |
batteries requiredNo | batteries required - | batteries required No | batteries required No | batteries required No | batteries required No |
item depth18.25 inches | item depth 3.75 inches | item depth 3.4 | item depth 0.5 inches | item depth - | item depth 3 |
global trade identification number00020352685335 | global trade identification number 00854920002022 | global trade identification number - | global trade identification number 00020352685328 | global trade identification number 00020352685380 | global trade identification number - |
styleHeater | style ECO 11 | style - | style Heater | style Point-of-Use | style - |
maximum operating pressure150 | maximum operating pressure - | maximum operating pressure 150 Pound per Square Inch | maximum operating pressure - | maximum operating pressure 150 | maximum operating pressure - |
sizeSmall | size 12 x 8 x 4 | size - | size Compact | size - | size - |
Review- | Review | Review - | Review | Review - | Review - |
Available On   | Available On | Available On | Available On  | Available On | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.7
2EcoSmartEcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
9.3 Efficient Energy Use9.1 Easy installation8.9 Temperature controlWhy we love it
Consistent hot water supply.
Compact and space-saving design.
Reduces monthly energy costs.
-
9.6
3WINTEMP
Electric Tankless Water Heater WINTEMP 27kW 240V, Whole House Hot Water Supply, On Demand Instant Endless Water Heater, with LED Temperature Display, WiFi Control, Up to 6.3 GPM, ETL Certified
9.1 Efficient Energy Use8.9 Easy installation8.6 Temperature controlWhy we love it
Compact design saves space.
Provides endless hot water.
Energy-efficient self-regulation.
Tankless Electric Water Heater Buyer's Guide
Written by Ryanne BrownIntroduction
Tankless electric water heaters are an energy-efficient and cost-effective solution for providing hot water on demand for your home or business. Unlike regular water heaters, tankless electric water heaters do not require a large storage tank, so they are more compact and can be installed in tight spaces. Tankless electric water heaters are also known as “on-demand” water heaters, as they heat water only when it is needed, reducing energy costs. When shopping for a tankless electric water heater, there are several important factors to consider, such as size, power output, water flow, and other features.
Types of Tankless Electric Water Heaters
Tankless electric water heaters come in a variety of types, including point-of-use, whole-house, and hybrid models. Point-of-use water heaters are small, wall-mounted water heaters that are designed to provide hot water for a single appliance, such as a sink or washing machine. Whole-house water heaters are larger models that can provide hot water for multiple appliances and fixtures in the home. Hybrid water heaters are a combination of point-of-use and whole-house water heaters; they are larger than point-of-use models, but smaller than whole-house water heaters. Some hybrid models also include a heat pump, which can help conserve energy.
Size and Power Output
When shopping for a tankless electric water heater, it is important to consider the size and power output of the model. The size of the unit is determined by the number of gallons of hot water it can provide per minute. The power output is measured in kilowatts (kW). As a general rule, the larger the unit, the higher the power output. It is important to choose a unit that is the right size for your needs in order to reduce energy costs.
Water Flow
Another important factor to consider when shopping for a tankless electric water heater is the flow rate, or the rate at which the water is heated. The flow rate is determined by the size of the unit, as well as the power output. Some models have adjustable flow rates, so you can adjust the rate at which the water is heated. It is important to choose a model with the right flow rate for your needs in order to ensure the most efficient use of energy.
Other Features
Tankless electric water heaters also come with a variety of other features, such as digital temperature controls, automatic shut-off, and energy-saving modes. Digital temperature controls allow you to adjust the temperature of the water, while automatic shut-off ensures the unit does not overheat. Energy-saving modes help reduce energy costs by automatically adjusting the heating element to the optimal temperature for the amount of hot water used. Some models also come with freeze protection, which prevents the unit from freezing in cold temperatures.
Conclusion
When shopping for a tankless electric water heater, it is important to consider the size, power output, water flow, and other features of the unit. Make sure to choose a model that is the right size and has the right features for your needs in order to ensure the most efficient use of energy and reduce energy costs. With the right tankless electric water heater, you can enjoy hot water on demand with minimal energy usage.
Our ranking system
At bestchoice.com, our team curates a selection of top products from a vast array available online, using a sophisticated ranking system based on carefully defined criteria.While traditional hands-on testing has its merits, our use of AI technology offers distinct advantages. AI allows us to process and analyze vast amounts of data from multiple sources, providing a comprehensive view that goes beyond what manual testing can achieve. This approach enables us to deliver insights that are aligned with current trends and consumer preferences, ensuring our reviews are both relevant and up-to-date.
Features
Our AI-driven analysis examines key attributes, capabilities, and other critical factors tailored to each product category. This method allows us to assess effectiveness from various perspectives, ensuring a well-rounded evaluation.
Consumer Reviews
We aggregate and evaluate consumer feedback from across the internet, giving weight to ratings and reviews that reflect the most reliable insights. AI enhances this process by filtering and prioritizing data, offering a balanced view without the need for direct personal endorsements.
Popularity
Our system also considers the popularity of products, analyzing factors such as market presence, reputation, and user satisfaction. By leveraging AI, we capture a comprehensive picture of a product's standing in the market, which may not always be evident through traditional testing.
Value for money
AI allows us to compare products based on attributes like price, specifications, and user feedback, helping to determine their value for money. This data-driven approach offers an efficient and reliable way to assess how products stack up against one another in terms of cost-effectiveness.
