240 Volt Rheem RTEX-13 Tankless Residential Water Heater

Reliability and consistency are both key characteristics of the Rheem RTEX-13 tankless water heater. If you’re looking for hot water on demand, minus the extra cost associated with a conventional water heater, the RTEX-13 is your answer. Manufactured primarily for residential applications, this tankless water heater punches above its weight.

Description

Reliability and consistency are both key characteristics of the Rheem RTEX-13 tankless water heater. If you’re looking for hot water on demand, minus the extra cost associated with a conventional water heater, the RTEX-13 is your answer. Manufactured primarily for residential applications, this tankless water heater punches above its weight. With a high efficiency rate and innovative features, this unit has been a crowd-pleaser. Known for providing robust appliances, Rheem continues to impress consumers across the world, especially with this tankless water heater. At TopTenWater.com, we’ve looked into the Rheem RTEX-13’s performance, price point, and what consumers have commented.

We like that the unit has an external digital thermostat control that can be adjusted. Add to that a LED display, adjusting the temperature is a breeze. The unit offers accuracy up the last degree. The durable copper heating elements are field serviceable and the power control technology is self-modulating. A great aspect of owning this appliance is that installation is simple since the ½ NPT adapters and a 3-foot electric cable come in the package. There’s also a side ½ inch side water connection included.  Energy efficiency of 99.8% will give you the ability to save money when running the unit.

For those who have a water saver shower head, they can expect up to 1.5 Gallons Per Minute of output. The temperature range output is from 80F degrees to 140F degrees. A standard hand sink can expect an output of 0.5 GPM, while a kitchen sink and dishwasher can operate on anywhere between 1 and 2 gallons per minute. The max flow of the Rheem RTEX-13 tankless water heater is 3.1. Overall, this is a great looking unit that can be installed relatively easily if you have some technical expertise. The threated feature of the unit allows for easy replacement so you continue to enjoy hot water on demand.

  • Great for use in small apartments with up to two people
  • Double pole breaker required for operation
  • Unit does not require venting, allowing users to install it in a location of their convenience
  • Ideal replacement for traditional water tanks
  • Highly efficient unit thanks to self-modulating technology
GOODBAD
Limited power consumptionEfficient in smaller settings
Electric operation doesn’t require ventingMax temperature range of 140F degrees
Priced competitivelyGPM may be low if draw is increased
Highly efficientWiring may be complicated for novice users

Features

  • 1-degree accuracy with thermostat
  • Uses ½” NPT connection on the side
  • Self-Modulating unit allows for lower power consumption
  • Heat exchanger comes with five-year warranty
  • Maintenance is simple thanks to easily replaceable heating elements
  • Flex hose required for installation
Amperage57
ColorGray
Maximum Temperature140F degrees
Minimum Temperature80F degrees
Minimum Activation Rate0.25
Required Voltage240V
Water ConnectionSide
Wattage13,000
Fuel SourceElectric
Heat Exchanger Warranty5 year
Height12”
Depth3.625”
Width8.25”
Water Connection Size½” NPT

The Rheem RTEX-13 is arguably among the more popular tankless water heaters on the market. Not only is that due to the company’s popularity in this niche, but also because the unit is designed to perform under a range of conditions. It has an output of 1.5 GPM and while that may be on the lower side, its self-modulating technology and efficiency make up for it. Most importantly, the tankless water heater is priced competitively in a crowded marketplace.


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