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Tankless Water Heaters Comparison - June 2025
| 1 Best Choice  9.8Exceptional | 2 Best Value  9.7Exceptional | 3  9.6Exceptional | 4  9.5Excellent | 5  9.4Excellent | 6  9.3Excellent |
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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 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 Ranein 65,000 BTU RV Tankless Water Heater, High Altitude Available, 12V, CSA Certificated, with Thermostatic Chamber and Multi-function Controller, On Demand Instant Hot Water Heater | 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 Ranein | Brand Generic |
Reviews | Reviews | Reviews | Reviews - | Reviews  | Reviews - |
Features | |||||
Easy installation 8.6 | Easy installation 9.1 | Easy installation 7.2 | Easy installation 7.0 | 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 | 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 9.1 | Efficient energy use 7.0 |
Tech Specs | |||||
color Gray | color - | color Gray | color - | color Without door | color White |
batteries included No | batteries included - | batteries included No | batteries included - | batteries included No | batteries included No |
included components Fittings, Aerators | included components - | included components Fittings, Aerators | included components - | included components Assembly pack x 1, Wired gigital controller x 1, Instruction manual x 1, Tankless water heater x 1 | included components 1 Water Heater 1 English Manual 4 Screws |
product dimensions 14.5W x 18.25H | product dimensions - | product dimensions 8.25W x 12.63H | product dimensions - | product dimensions 15W x 15H | product dimensions 2.8W x 4.33H |
item weight 14.78 pounds | item weight - | item weight 7 pounds | item weight - | item weight 31.2 pounds | item weight 2.42 pounds |
voltage 240 Volts | voltage - | voltage 240 Volts | voltage - | voltage 12 Volts DC | voltage 110 Volts |
batteries required No | batteries required - | batteries required No | batteries required - | batteries required No | batteries required No |
maximum flow rate 4.4 Gallons Per Minute | maximum flow rate - | maximum flow rate 2.68 Gallons Per Minute | maximum flow rate - | maximum flow rate 3.9 Gallons Per Minute | maximum flow rate - |
wattage 18000 watts | wattage - | wattage 11 KW | wattage - | wattage - | wattage 3000 watts |
customer reviews4.4 4.4 out of 5 stars 1, 709 ratings 4.4 out of 5 stars | customer reviews - | customer reviews 4.3 4.3 out of 5 stars 289 ratings 4.3 out of 5 stars | customer reviews - | customer reviews 4.6 4.6 out of 5 stars 243 ratings 4.6 out of 5 stars | customer reviews - |
style Heater | style - | style Water Heater | style - | style - | style Indoor Installation |
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
2EcoSmart47% 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 Heaters Buyer's Guide
Written by Ryanne BrownIntroduction
Tankless water heaters are becoming increasingly popular in homes due to their energy efficiency and convenience. By eliminating the need for a storage tank, tankless water heaters provide a continuous supply of hot water, reduce energy consumption, and help to save space. However, when shopping for a tankless water heater, it is important to consider several factors to find the best unit for your home. This guide will provide an overview of the different types of tankless water heaters, their features, and the factors to consider when making your purchase.
Types of Tankless Water Heaters
There are two main types of tankless water heaters: electric and gas. Electric tankless water heaters are powered by electricity and use heating elements to heat water as it passes through the unit. Gas tankless water heaters, on the other hand, use either natural gas or propane to heat water as it passes through a heat exchanger. Both types of tankless water heaters are efficient and can provide a continuous supply of hot water. However, gas water heaters tend to be more powerful and have a higher flow rate than electric models.
Features to Consider
When choosing a tankless water heater, there are several features to consider. These include the size of the unit, the flow rate, the energy efficiency rating, and the temperature range. The size of the unit will depend on the amount of hot water you need and the space available for installation. The flow rate is the amount of hot water the unit can deliver at a given time. The energy efficiency rating is an indication of how much energy the unit will use to heat the water, and the temperature range is the range of temperatures the unit can provide. It is important to consider these features when selecting a tankless water heater.
Installation Considerations
In addition to the features of the unit itself, there are a few installation considerations to keep in mind when selecting a tankless water heater. For example, electric units require a dedicated power supply, while gas units require venting for safety. It is also important to consider the amount of space available for installation. Tankless water heaters are typically more compact than traditional storage tank water heaters, but they still require adequate space for installation. When making your purchase, be sure to consider these installation requirements.
Cost Considerations
Cost is another important factor to consider when selecting a tankless water heater. Prices can vary significantly depending on the size, features, and energy efficiency of the unit. It is important to compare prices and features of different models to find the most cost-effective option. Additionally, installation costs should be factored into the overall cost of the unit. Installing a tankless water heater can be more expensive than installing a traditional storage tank water heater, but the long-term savings in energy costs may make it well worth the investment.
Conclusion
When selecting a tankless water heater, it is important to consider several factors. The size, flow rate, energy efficiency rating, temperature range, installation requirements, and cost of the unit should all be taken into account. By considering these factors, you can find the best tankless water heater for your home and start enjoying the convenience and energy savings that a tankless water heater has to offer.
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.
