Rheem RTEX-18 Tankless Water Heaater Review 2021

Best Rheem RTEX-18 Tankless Water Heater Review 2019
Electric Tankless Water Heaters

The pro classic energy efficient Electric Tankless water heaters provide endless/continuous hot water fast and on-demand for single point-of-utilization like showers, sinks, or bathroom or numerous applications.  The Rheem RTEX-18 240V 2 Tankless Water Heater is capable of providing endless and instant energy efficient hot water for houses up to one to two bathrooms. These compact tankless housing electric water heaters are also awesome RVs, campers, travel trailers, and mobile homes.

Best Rheem RTEX-18 Tankless Water Heater Reviews 2021:

Rheem’s compact design permit such small, yet extremely powerful, environmentally friendly and cash saving seven gallons apiece minute point of utilization Tankless Water Heaters to fit simply under bathroom and kitchen counters and sinks.

BEST Rheem RTEX-18 240V Tankless Water Heater 2019 REVIEWSKey Features Of The Rheem RTEX-18 Tankless Water Heater:

  • The two heating elements are engrossed in strong copper.
  • The tankless water features an external digital thermostatic control that accompanies an LED display.
  • Offers unlimited hot water
  • Aside from simple installation, the Rheem RTEX-18 240V also promises simple replacement and easy use.
  • It is extremely simple to install
  • With this unit, you can save up a significant amount.


According to the reviewers, Rheem RTEX-18 240V 2 Residential Tankless Water Heating Chambers is very easy to install, even for a layperson. You won’t need to make room for this unit because it is so compact. The whole unit is just 4″x15″x19″, that is small adequate to fit into even the smallest areas. Its smart, good looks denote that it won’t smash into the interior design either.

With the digital temp controls, you can set the perfect water temp in increases of 1°F ranging from eighty degrees to one hundred and forty degrees. Not just that, but it is 99.8 percent energy efficient, denoting the Rheem RTEX-18 will assist in keeping such high electric invoices in check. It produces up to 4.4GPM, riding upon the temp of the inlet water, which ought to offer adequate for some dish washing and a couple of hot showers.


A few customers have stated that they experience flickering of the LED dimmable light bulbs when the heater connects. The issue is simply resolved by installing the glowing bulbs; however, the draw on the electric power might reason problems with other machines. If you are working on less than two hundred AMP household service, you might have to upgrade to offer the unit with enough power.

While not the most frequent complaint, a few customers have stated that the installation drawings are printed wrong way up. For somebody who has zero experience, it can cause quite an issue. Users have stated that they have had to contact a professional to overcome this problem.

Specifications Of Rheem RTEX-18 :

  • Voltage: 240V
  • Weight: 10.0000
  • Required Breaker: 2 40AMP
  • 75AMPs
  • Power: 18kW
  • Wire Size: 8AWG
  • Water Connection: 3/4Inch
  • Energy Source: Electric
  • Seven gallons apiece minute maximum flow rate

All in all, the Rheem RTEX-18 240V 2 Heating Chambers is an outstanding electric tankless water hot heater for most homes with average hot water requirements. Whether installed as a point-of-utilization unit, or a complete home water heater, it offers a nonstop supply of hot water, and it is nearly one hundred percent energy efficient. What is more, it’s covered by the Rheem’s guarantee, so if you have issues, it’ll be replaced or repaired.

Frequently Asked Questions Section:

Q: How Many Breakers And What Is AMP Of This Unit?

A : This unit needs forty AMP breakers and eight AWG cable.

Q: How Many Gallons Apiece Minute Does This Unit Supply?

A: You get hot water on-demand. It’ll heat as much water as you want and need.

Q: How Many Restrooms Does It Cover?

A: This unit covers one at a time. If the temp is cold outside, you’ll acquire warm water not hot.

Q: Can This Unit Be Installed Outside The House During Winters?

A: No. it’s an interior water heater. There are exterior units available if you want.

Q: How Does It Attach To The Wall?

A: It just screws flat to the wall. The material of the wall will decide which kind of anchors and fasteners to utilize.

Q: Do You Require An Air Separator?

A: If you’re just utilizing it for hot water, the answer would be NO. If you’re using it for the hydronic heat, then the answer would be YES.

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