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Tankless Hot Water Heater Comparison - April 2026
| 1 Best Choice  9.8Exceptional | 2  9.6Exceptional | 3  9.5Excellent | 4 Best Value  9.4Excellent |
| View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon |
ModelRheem 18kW 240V Tankless Electric Water Heater, Gray | Model Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray | Model EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology | Model Rheem 11kW 240V Tankless Electric Water Heater |
BrandRheem | Brand Rheem | Brand EcoSmart | Brand Rheem |
Reviews | Reviews | Reviews  | Reviews |
Features | |||
Easy installation 8.6 | Easy installation 8.6 | Easy installation 9.1 | Easy installation 7.2 |
Efficient energy use 8.6 | Efficient energy use 9.6 | Efficient energy use 9.3 | Efficient energy use 9.6 |
Temperature control 8.6 | Temperature control 9.4 | Temperature control 8.9 | Temperature control 8.6 |
Worth the money 7.9 | Worth the money 8.4 | Worth the money 8.9 | Worth the money 8.4 |
Tech Specs | |||
heat output18 Kilowatts | heat output 24 Kilowatts | heat output 11 Kilowatts | heat output 11 Kilowatts |
is electricYes | is electric Yes | is electric Yes | is electric Yes |
maximum flow rate4.4 Gallons Per Minute | maximum flow rate 5.9 Gallons Per Minute | maximum flow rate 3.1 Gallons Per Minute | maximum flow rate 2.68 Gallons Per Minute |
colorGray | color Gray | color White | color Gray |
batteries includedNo | batteries included No | batteries included No | batteries included No |
included componentsFittings, Aerators | included components Fittings, Aerators | included components electric tankless water heater | included components Fittings, Aerators |
wattage18000 watts | wattage 24 KW | wattage 13000 watts | wattage 11 KW |
efficiency99.8% | efficiency 99.8% Energy efficient | efficiency 99.8 % | efficiency 99.8% |
global trade identification number00020352685335 | global trade identification number 00020352685397 | global trade identification number 00854920002022 | global trade identification number 00020352685380 |
product dimensions14.5"W x 18.25"H | product dimensions 17.63"W x 18.25"H | product dimensions 8"W x 11.5"H | product dimensions 8.25"W x 12.63"H |
item weight14.78 pounds | item weight 17.8 pounds | item weight 6.5 pounds | item weight 7.04 pounds |
special featuresLED Display | special features LED Display | special features LED Display | special features LED Display |
voltage240 Volts | voltage 240 Volts | voltage 220 Volts | voltage 240 Volts |
item package quantity1 | item package quantity 1 | item package quantity 1 | item package quantity 1 |
styleHeater | style Water Heater | style ECO 11 | style Point-of-Use |
mounting typeWall | mounting type Wall | mounting type Wall | mounting type Wall |
usageInside; Professional | usage Inside; Professional | usage - | usage Inside; Professional |
maximum temperature140 Degrees Fahrenheit | maximum temperature 140 Degrees Fahrenheit | maximum temperature 140 Degrees Fahrenheit | maximum temperature - |
maximum operating pressure150 | maximum operating pressure 150 | maximum operating pressure - | maximum operating pressure 150 |
finishStainless Steel | finish Stainless Steel | finish - | finish Stainless Steel |
shapeRectangle | shape Rectangle | shape - | shape Rectangle |
installation methodWall Mount | installation method Wall Mount | installation method - | installation method Wall Mount |
batteries requiredNo | batteries required No | batteries required - | batteries required No |
item depth18.25 inches | item depth 3.5 inches | item depth 3.75 inches | item depth - |
Review- | Review - | Review | Review - |
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
9.5
3EcoSmartEcoSmart 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.
Tankless Hot Water Heater Buyer's Guide
Written by Ryanne BrownIntroduction
Tankless hot water heaters are a great way to increase energy efficiency and reduce energy costs in your home. They are also an environmentally friendly alternative to traditional water heaters. Tankless hot water heaters provide hot water on demand, meaning you will never run out of hot water. This guide will provide an overview of the different types of tankless hot water heaters, their features, and benefits.
Types of Tankless Hot Water Heaters
There are two main types of tankless hot water heaters: electric and gas. Electric tankless hot water heaters are typically the most affordable option and are easier to install than gas models. They are also very efficient and can save you a significant amount of money in energy costs. Gas tankless hot water heaters have higher upfront costs but can save you even more on your energy bills in the long run. They are also more powerful so you can heat larger amounts of water in a shorter period of time.
Features of Tankless Hot Water Heaters
Tankless hot water heaters come with a variety of features to make them more efficient and cost-effective. Many models come with adjustable temperature settings so you can set the exact temperature you need for your hot water. Some models also come with digital displays and remote controls so you can conveniently adjust the temperature from anywhere in your home. Other features to consider include energy-saving modes, water flow sensors, and built-in safety features.
Benefits of Tankless Hot Water Heaters
Tankless hot water heaters provide several benefits to homeowners. The most obvious benefit is the energy savings. Tankless hot water heaters use much less energy than traditional water heaters, so you can save a significant amount of money on your energy bills. They also provide hot water on demand, so you will never run out of hot water. Additionally, tankless hot water heaters are much more compact than traditional water heaters, so they can fit into tighter spaces in your home.
Things to Consider When Buying a Tankless Hot Water Heater
There are several factors to consider when buying a tankless hot water heater. The most important factor to consider is the size of the unit. Make sure to measure the space where you plan to install the unit to determine the size you need. You should also consider your hot water needs to make sure you choose a unit with enough capacity to meet your needs. Additionally, you should consider the features you want and how much you are willing to spend on a tankless hot water heater.
Conclusion
Tankless hot water heaters are a great way to save energy and money. They provide hot water on demand and can fit into tight spaces in your home. When buying a tankless hot water heater, make sure to consider the size, your hot water needs, the features you want, and how much you are willing to spend. With the right tankless hot water heater, you can enjoy the benefits of energy savings and hot water on demand.
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.
