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Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY

4.4 out of 5 stars 490 ratings

Price: $260.00 & FREE Returns
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Heater
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  • External adjustable digital thermostatic control with LED display (+/1 degree accuracy
  • Durable Copper immersion two heating elements, field Serviceable.Self-modulating power control
  • Simple installation – 1/2 NPT adapters included; side 1/2 inch Compression water connections
  • 99.8% energy efficient. External controls to adjust temperature in increments of 1°f. Water-Saver Shower Head – 1.5 GPM
  • Threaded for easy replacement, simple installation, digital temperature display 54 A. 13kW Model Flow Rate: up to 3.17 GPM
  • 54 A
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Frequently bought together

  • Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
  • +
  • 3M Aqua-Pure Whole House Scale Inhibition Inline Water System AP430SS, Helps Prevent Scale Build Up On Hot Water Heaters and Boilers
  • +
  • 3/4 IPS LF EXP E2 With PRV Tankles
Total price: $398.55
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Customer Rating 4.4 out of 5 stars (490) 4.4 out of 5 stars (2432) 4.4 out of 5 stars (522) 4.4 out of 5 stars (3199) 4.0 out of 5 stars (52)
Price $260.00 $206.45 $385.00 $374.38 $171.00
Sold By GP Conservation Amazon.com Big Frog Supply Amazon.com Big Frog Supply
Item Dimensions 12.63 x 8.25 x 3.63 inches 3.75 x 8 x 11.5 inches 18.25 x 3.5 x 14.5 inches 3.63 x 14 x 17 inches 5.88 x 2.75 x 10.88 inches

Product description

Style:Heater

Professional classic® tankless electric water heaters offer continuous hot water quick and on demand for single point-of-use or multiple applications

Product information

Style:Heater

Technical Details

Additional Information

Warranty & Support

Product Warranty: For warranty information about this product, please click here. [PDF ]

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Product guides and documents

User Manual [PDF ]

Important information

Wattage

13 KW

Bulb Voltage

240 volts


Customer Questions & Answers

Customer reviews

4.4 out of 5 stars
4.4 out of 5
490 global ratings
How are ratings calculated?

Top reviews from the United States

Reviewed in the United States on August 1, 2018
Style: HeaterVerified Purchase
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5.0 out of 5 stars Works GREAT !
By SEF on August 1, 2018
Installed last month in a 3 Season cottage in the upper mid west. 1 Shower, 1 Toilet, 1 Bathroom sink, and one Kitchen sink. Ground water if from a private well and is between 45 and 55 degrees coming into the house. New Moen Shower Faucet 1.5 gpm flow. I have the temp on the water heater set to 110 degrees and you can shower for ever with no fluctuation in temp. I did notice however that when the bath sink is turned on ALL HOT wide open we will get some fluctuation in temp, turning down the water volume on the faucet will make that go away. NO problem with mixture of Hot and Cold typical hand washing temp, that is steady, even, comfortable temp.

I installed the unit with a shut off on both sides, I have not yet taken the time to play with the valve on the output side of the heater to slightly restrict the flow out to eliminate the ALL HOT on the sink issue but think from what I have read that adding that slight restriction on that end will eliminate the fluctuation, but now just turning the faucet volume down slightly takes care of it.

If the water flows through the heater too fast, it doesn't actually have time to get hot, adding the restriction slows the flow slightly to allow for adequate heating.
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123 people found this helpful
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Reviewed in the United States on January 7, 2018
Style: HeaterVerified Purchase
102 people found this helpful
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Reviewed in the United States on March 21, 2018
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61 people found this helpful
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Reviewed in the United States on May 13, 2017
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86 people found this helpful
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Reviewed in the United States on January 26, 2018
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41 people found this helpful
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Reviewed in the United States on June 6, 2018
Style: HeaterVerified Purchase
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5.0 out of 5 stars This tankless water heater is the real deal!
By Clay H. on June 6, 2018
I absolutely love this little water heater. I bought it for a garage apartment renovation so I could run a hand sink, a shower, a stacked washer and dryer, and I have to say, I'm really blown away by it. I took my time with the installation, planned everything out carefully, and everything works so well. I get crazy hot water to the hand sink in about 15 seconds, and it just runs and runs. I'm so impressed by it, that I'm buying another one for my office.
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38 people found this helpful
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Reviewed in the United States on February 11, 2019
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24 people found this helpful
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Reviewed in the United States on June 24, 2017
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36 people found this helpful
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Top reviews from other countries

Linda
5.0 out of 5 stars Works well for us
Reviewed in Canada on September 13, 2019
Style: HeaterVerified Purchase
4 people found this helpful
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Cyril R Beaton
1.0 out of 5 stars Inconsistent fluctuating water temperature flow.
Reviewed in Canada on June 19, 2019
Style: HeaterVerified Purchase
4 people found this helpful
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Gboy
5.0 out of 5 stars Works as advertised.
Reviewed in Canada on March 5, 2019
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3 people found this helpful
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Almeida
5.0 out of 5 stars Great Heater
Reviewed in Canada on July 15, 2019
Style: HeaterVerified Purchase
3 people found this helpful
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Amazon Customer
1.0 out of 5 stars Don t buy it
Reviewed in Canada on December 21, 2020
Style: HeaterVerified Purchase
One person found this helpful
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