Red Region above 71 °F

Tankless Water Heater Recommendations for Regions with Temperatures Above 71°F

We have taken some top tankless water heater manufacturers and evaluated them for several different criteria. Based on the criteria listed below, here are the best tankless water heaters to purchase.


  • Customer Satisfaction - This is determined by the total of reviews and stars received from various review sites.
  • Price - Just because something is expensive does not mean it’s worth buying. Price is a major determining factor for most consumers when making a purchase. So, we evaluated a product on its price compared to other similar products on the market. Based on price, we rated each with a “Great Value”, “Average”, “Expensive.”
  • Energy Factor - Energy Factor (EF) is a measurement that is used to describe the energy efficiency of a water heater. To calculate a water heater's energy factor, you take the amount of energy the water heater puts to use and divide it by the total amount of energy that goes into powering the unit.
  • GPM - Gallons Per Minute is one of the most important factors when considering a tankless water heater. If the GPM is too low, then you will be unable to run appliances and showers simultaneously. It is important to understand this when selecting a tankless hot water heater because it won’t be able to keep up with your household needs.
  • Product Features - Some tankless water heaters have added features that add value to their products. Some examples of these are built-in maintenance alerts, product warranties longer than the industry standard, quality of materials used to manufacturer their product and other safety features to name a few.


The best point of use tankless water heater

ECO90 Self-Modulating Instant Hot Water Point Of Use Tankless Water Heater 

Customer Satisfaction - 4.4

Price - Great Value

Energy Factor - 0.998

GPM - 1.5 

Features - The ECO90B electric water heater promises no "cold sandwiching" with a unique heating element that avoids corrosion. It is also self-modulating for stable temperature control.

The best electric tankless water heater

Eemax EEM24018 Electric Tankless Water Heater, Blue

Customer Satisfaction - 4.5

Price - Great Value

Energy Factor - 0.97

GPM - 5.3 GPM

Features - ‎ Self-modulating, Warranty: 5 years for leaks and 1 year for parts.


The best gas tankless water heater

Rinnai Indoor Tankless Hot Water Heater / V65iN / Natural Gas / 6.3 GPM, Large, V65iN-Natural 6.5

Customer Satisfaction - 4.8

Price -Great Value

Energy Factor - 0.82

GPM - 6.3 GPM 

Features - Design that prevents corrosion, 10-year warranty, certified for mobile home installation and leak protection.


The best commercial tankless water heater

Rinnai CU Series Commercial Tankless Gas

Customer Satisfaction - 5

Price - Expensive

Energy Factor - 0.97

GPM - 11 GPM 

Features - Maintenance alerts, multiple venting options, built-in freeze control, 8-year warranty.



Tankless Water Heaters are Vulnerable to the Problems Hard Water can Cause

Protecting your tankless water heater from hard water scale is very important. You can protect your unit by cleaning the unit manually at least once a year or you can simply attach a HydroFLOW device around the cold water line going into the tankless water heater. From the moment you plug in the HydroFLOW device your tankless water heater will be protected all year. You will also get the added benefit of killing bacteria, algae and reducing corrosion throughout your entire plumbing system.
For more detailed information about tankless water heaters please read our blog:
Tankless Water Heaters.
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