The Best Tankless Water Heater

Having access to hot water anytime you want has certainly become a necessity in every household who can afford it. For a person who hates the cold water during the winter, a tankless water heater is very a handy device. It can provide hot, searing water 24 hours a day, while also keeping the energy bill down. Aside from that, since they are slimmer than their traditional counterparts, a tankless water heater will require little storage space. Plus, you don’t have to shuffle your whole house up and down just to accommodate it. To save you the trouble of looking for the best tankless water heater, we recommend you get the Rheem RTEX 13 Electric Tankless Water Heater. This is considered the best tankless water heater today. Why? Keep reading this article to find out.

Main Characteristics

The RTE 13 is a compact electric tankless water heater that only weighs 8 pounds and is 7.25 inches wide and 10 inches tall. It is a metal box with a gray finish. The great thing about this water heater is that you can install it without opening the box. There are 0.5-inch connections piping water into the unit and moving hot water out of it on both sides. With this unit, you can control temperature from a panel built into the front. The panel has red and green LEDs indicating active and standby modes. It also has a thermostat dial that adjusts temperature over nine settings. This tankless water heater can be used for residential or industrial applications. It can heat water for a small apartment or single-occupant housing unit, but it is most suited as a point-of-use water heater. We recommend you should only install it to cover a maximum of three fixtures that are not far from the heater. If you use it as a single point-of-use heater, it can serve a garage, shop, laboratory, boat or RV. This tankless water heater only requires 0.4 gpm to activate its heating elements. It can also put out a maximal flow of 4 gpm. That means it is enough to supply both a shower head and bathtub.

Pros and Cons


  • Easy to use
  • Very compact
  • Inexpensive
  • Can provide hot water to one low-rated tap and one shower in your home
  • Perfect if you live alone in a small studio apartment


  • Not that suitable for households with more than four members
  • Flow rate tends to slow down as temperature rises
  • Point of Use models will require multiple purchases for larger homes


The Rheem RTE 13 is designed to be a space-saving electric tankless water heater. It is perfect for replacing bulky, inefficient water heaters. The unit is so small that you can easily keep it under your sink if you want to save up space in your bathroom. Plus, you can actually keep it anywhere you want, even inside a small cabinet, because it takes up very little space. This is what makes the Rheem RTEX 13 very ideal for small homes, studio apartment, and even professional offices and laboratories. Aside from it being a space saver, it is also an energy-efficient unit, but you do have to modify your home electricity to supply 240 volts and 60 amps. It is also designed in such a way that it doesn’t need vents. That’s because it is an electric unit.

Special Features

What makes this tankless water heater special is its ability to control the temperature. The device will allow you to fine-tune the temperature with augmentations of One Fahrenheit. The thermostat also has an LED display, which will allow the user to set the temperature effortlessly. The other commendable feature of this model is its flow rate. It has a 4 Gallon per Minute rate, which will allow you to run water on a low-graded tap and a shower simultaneously.


The Applicable Warranty Period for this unit is 10 years from the Effective Date for the heat exchanger and three years from the Effective Date for the component parts if the water heater is installed in a single-family dwelling. If the water heater is installed anywhere other than a single-family dwelling or in any system in which the water is recirculated, the Applicable Warranty Period will be limited to one year from the Effective Date.


Even though this water heater is still relatively new, the RTEX 13 has already proven that it deserves its spot as the best tankless water heater. It is a reliable and user-friendly water heater that is also cost-effective at the same time. This water heater will allow you to keep the water in your home hot at all times and save a lot on your electricity bill. Overall, it is a very good investment.

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