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Tankless Water Heater Comparison - July 2025
| 1 Best Choice  9.9Exceptional | 2 Best Value  9.8Exceptional | 3  9.7Exceptional | 4  9.6Exceptional | 5  9.5Excellent |
| View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon | View DealOn Amazon |
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 Rheem 11kW 240V Tankless Electric Water Heater | Model NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU | Model Generic Tankless Water Heater Electric, Instant Hot Water Heater Under Sink, 3000W 110V On Demand Mini Water Heater for RV Kitchen Bathroom, White |
BrandRheem | Brand EcoSmart | Brand Rheem | Brand Rinnai | Brand Generic |
Reviews | Reviews | Reviews | Reviews - | Reviews - |
Features | ||||
Easy installation 8.6 | Easy installation 9.1 | Easy installation 7.2 | Easy installation 7.0 | Easy installation 8.4 |
Temperature control 8.6 | Temperature control 8.9 | Temperature control 8.6 | Temperature control 7.0 | Temperature control 7.0 |
Efficient energy use 8.6 | Efficient energy use 9.3 | Efficient energy use 9.6 | Efficient energy use 7.0 | Efficient energy use 7.0 |
Tech Specs | ||||
color Gray | color - | color Gray | color - | color White |
batteries included No | batteries included - | batteries included No | batteries included - | batteries included No |
included components Fittings, Aerators | included components - | included components Fittings, Aerators | included components - | included components 1 Water Heater 1 English Manual 4 Screws |
wattage 18000 watts | wattage - | wattage 11 KW | wattage - | wattage 3000 watts |
product dimensions 14.5W x 18.25H | product dimensions - | product dimensions 8.25W x 12.63H | product dimensions - | product dimensions 2.8W x 4.33H |
item weight 14.78 pounds | item weight - | item weight 7 pounds | item weight - | item weight 2.42 pounds |
voltage 240 Volts | voltage - | voltage 240 Volts | voltage - | voltage 110 Volts |
style Heater | style - | style Water Heater | style - | style Indoor Installation |
batteries required No | batteries required - | batteries required No | batteries required - | batteries required No |
Review- | Review | Review - | Review - | Review - |
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
9.8
2EcoSmart30% OffEcoSmart 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 Water Heater Buyer's Guide
Written by Ryanne BrownIntroduction to Tankless Water Heaters
Tankless water heaters are an efficient and space-saving alternative to traditional water heaters. Instead of storing hot water in a tank, tankless water heaters heat water on demand and deliver it to the user as it is needed. Tankless water heaters are a great way to reduce energy costs and provide hot water for an entire home. They are also more reliable than traditional water heaters, as they are less likely to break down due to age or air pressure. Tankless water heaters come in several different sizes, styles, and types, allowing the user to choose the best model for their needs.
Types of Tankless Water Heaters
Tankless water heaters come in several different types, including electric, gas, and propane. Each type has its own advantages and disadvantages, so it is important to research and compare the different models before making a purchase. Electric tankless water heaters are generally the most energy efficient and cost-effective, but they may not be able to provide enough hot water for larger households. Gas and propane tankless water heaters are more powerful and can provide hot water for larger households, but they are not as energy efficient as electric models. It is important to consider the size of the household and the type of fuel available when selecting a tankless water heater.
Features of Tankless Water Heaters
The most important features to consider when purchasing a tankless water heater are the size, energy efficiency, and installation requirements. The size of the tankless water heater should be determined by the size of the household and the amount of hot water needed. Energy efficiency is important to consider, as it will determine how much energy is used each month. Many tankless water heaters are also available with energy-saving features, such as temperature control, that can help reduce energy costs. Installation requirements can vary depending on the type of tankless water heater, and it is important to ensure that the model chosen is compatible with the home's existing plumbing system.
Comparing Tankless Water Heaters
When comparing tankless water heaters, it is important to look at the features, price, and energy efficiency of each model. Features such as temperature control and timer settings should be taken into account, as well as the installation requirements. Price should also be taken into consideration, as some models may be more expensive than others. Energy efficiency is also important, as it will determine how much energy is used each month. Comparing different models and features can help the buyer find the best tankless water heater for their needs.
Maintenance of Tankless Water Heaters
Tankless water heaters require regular maintenance to ensure they are working properly and efficiently. It is important to clean the unit regularly to remove any build-up of sediment or dirt, as this can reduce the efficiency of the heater. The filters should also be replaced periodically to ensure that the water is being filtered properly. It is also important to check the unit regularly for signs of leaks or other issues.
Conclusion
Tankless water heaters are an efficient and space-saving alternative to traditional water heaters. With the right model, they can provide hot water for an entire home and help reduce energy costs. There are several different types, sizes, and features of tankless water heaters available, so it is important to compare models and features before making a purchase. Regular maintenance is also important to ensure that the unit is working properly and efficiently.
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.
