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Sold by: Miami Water Heater
Sold by: Miami Water Heater
(141 ratings)
83% positive over last 12 months
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Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY

4.4 4.4 out of 5 stars 1,202 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Water Heaters by Rheem

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Purchase options and add-ons

Brand Rheem
Product Dimensions 8.25"W x 12.63"H
Special Feature LED Display
Color Gray
Wattage 13 KW
Capacity
1.5 Gallons
Power Source
Battery Powered
Item Weight
0.01 Ounces
Style
Heater

About this item

  • 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
See more product details

Customer ratings by feature

Energy efficiency
4.3 4.3
Easy to install
4.2 4.2
Temperature Control
4.1 4.1
Value for money
4.0 4.0

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Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
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Price-56% $300.00
List:$680.00
-7% $335.00
List:$359.00
$239.99$299.99$169.99$299.99
Delivery
Get it as soon as Monday, Apr 1
Get it as soon as Thursday, Apr 4
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Customer Ratings
Energy efficiency
4.3
4.8
4.0
3.8
4.5
4.6
Temperature Control
4.1
4.9
4.0
3.9
4.6
4.4
Easy to install
4.2
4.0
3.9
4.3
4.4
Tech Support
4.8
3.8
3.5
3.6
4.1
Value for money
4.0
3.9
3.6
4.3
Sold By
Miami Water Heater
Amazon.com
THMOS
Sain Store
yuanroo
ECOTOUCH
capacity
1.5 gallons
240 gallons
13 liters
18 kilowatts
power source
Battery Powered
Hard Wiring Required
208~240V Hardwire
AC
240V/60Hz hardwire
mounting type
Wall
Wall
Wall
Wall
heat output
13 kilowatts
14400 watts
13 kilowatts
material
lead free
Alloy Steel
Metal, Aluminum, Brass
style
Heater
Plus
11kW
Indoor Installation
13KW
‎Digital

From the manufacturer

About Us

Brothers Richard and Donald Rheem founded Rheem Manufacturing Company in Emeryville, CA, in 1925. While the company has produced a number of products in its nearly 100 years of operation, Rheem is currently the manufacturer that produces heating, cooling, water heating, pool & spa heating and commercial refrigeration products, and it is one of the largest manufacturer of water heating products in North America.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here. [PDF ]

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


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Product guides and documents

Product Description

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

Important information

Wattage

13 KW

Bulb Voltage

240 volts

Customer reviews

4.4 out of 5 stars
4.4 out of 5
1,202 global ratings

Customers say

Customers like the performance, ease of installation, value, and size of the water heater. For example, they mention that it works well, it's easy to mount, and it'll pay for itself in two years. That said, some complain about the leakage, durability, and quality. Opinions are mixed on temperature.

AI-generated from the text of customer reviews

130 customers mention109 positive21 negative

Customers like the performance of the water heater. They mention that it works well, has good heat, and has never had any issues. Some say that it's perfect for their limited space and that it provides good heat.

"super easy to install and has been working great for a long time.. i would say it takes up to 30 seconds to a minute to get hot with our plumbing..." Read more

"...Item works extremely well, water gets hot in bathroom almost instantly, the unit in in basement below bathroom...." Read more

"Works as advertised and well packaged" Read more

"Worked, fair price, easy to install, but it could not heat our one rainfall shower alone...." Read more

61 customers mention51 positive10 negative

Customers like the ease of installation of the water heater. They mention that it is super easy to install, mount, and maintain. They also say that the plumbing was very easy, and the water piping was easy.

"super easy to install and has been working great for a long time.. i would say it takes up to 30 seconds to a minute to get hot with our plumbing..." Read more

"Worked, fair price, easy to install, but it could not heat our one rainfall shower alone...." Read more

"this was a pretty easy replacement for the previous unit which had corroded inside and failed to provide any hot water...." Read more

"...It was easy to replace my last unit that had burned out; only took about an hour total. Some good and bad points:First the bad:..." Read more

35 customers mention27 positive8 negative

Customers like the value of the water heater. They say it's a great value, works as expected, and paid for itself in 2 years. Some are pleased with the cost and quality. That said, some complain about the electric bill plummeting.

"...Great value for money, especially if you install it yourself...." Read more

"Worked, fair price, easy to install, but it could not heat our one rainfall shower alone...." Read more

"...The price seems right and they seem to work OK. This is in a rental apartment. I might consider them for a vacation home...." Read more

"...six months now and it's putting out only a little hot water, extremely disappointing...." Read more

25 customers mention22 positive3 negative

Customers like the size of the water heater. They say it takes up very little space and heats water fast. They also say it's compact, but efficient, and a powerhouse for its size. Customers also mention that it'll fit in a small space well and is good for small usage.

"...And one thing I love about these is they are so small and light and now that the wiring's re-done it will be a breeze to swap out in a few years..." Read more

"...a tiny house and had very limited space and this was so perfect and tiny!! We never run out of hot water and the water is HOT!..." Read more

"This makes the water plenty hot. Fits a small space well." Read more

"...For me it's a space saver and that's why I like it.Update: This thing nearly flooded my cabin...." Read more

95 customers mention57 positive38 negative

Customers are mixed about the temperature of the water heater. Some mention that it remains hot for a long time, while others say that it doesn't get fully hot.

"...Item works extremely well, water gets hot in bathroom almost instantly, the unit in in basement below bathroom...." Read more

"...It was barely warm, which is very generous. More like, it wasn’t cold. Now, can it heat a sink to scorching temps? yes. two sinks at the same time?..." Read more

"...Haven't had it long, but it amazes me. Hot water and all you need to take a long shower. Love it, have it in are cabin, just what we needed." Read more

"...Produces hot water 'almost' instantaneously and keeps a pretty constant and stable temperature once its left running for a bit...." Read more

18 customers mention0 positive18 negative

Customers are dissatisfied with the leakage of the water heater. Some mention that the unit started leaking at the intake, supply IP fitting, and heating element. They also say that water dripped in their laundry room due to the used fittings. Some say that the heating element began to leak at the weld. Overall, some customers are not happy with the quality and durability of the product.

"the supply fitting leak had to replace them" Read more

"Had to return because there was no way to drain water from tank to prevent freezing. I did return it." Read more

"This was an emergency installation. Our water heater tank leaked...." Read more

"...to make certain all the fittings are water tight as they are prone to leak easily if care is not taken to ensure they seal properly...." Read more

16 customers mention0 positive16 negative

Customers are dissatisfied with the durability of the water heater. They mention that it lasted less than a year, failed within 5 months of use, and was dead within the first few days. The inlet cracked after 2 months and caused a water mess. It works well but has a limited lifetime and is not strong enough for cold climates.

"This unit failed within 5 months of use...." Read more

"...These units only last two or three years max...." Read more

"...After installing, I noticed it would pop the circuit after about 20 seconds of use...." Read more

"...In Jan. of 22 unit fails. I am 68 years old and have been in construction and home repair for most of my life...." Read more

14 customers mention4 positive10 negative

Customers are dissatisfied with the quality of the water heater. They mention that it is not reliable, feels extremely cheap, and has poor parts or labor. Some customers also report that the unit was defective and charged a restocking fee.

"...I like the unit when it works but am getting frustrated at its unreliability." Read more

"Rheem really dropped the ball on quality with this unit. It feels extremely cheap due to its plastic backplate, the old models utilized a sheet..." Read more

"Installation was super easy with pex fittings and 72" of copper. Well built, easy to read LCD temp..." Read more

"...This thing is actually just an eco...rebranded. what a piece of junk...." Read more

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Top reviews from other countries

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Linda
5.0 out of 5 stars Works well for us
Reviewed in Canada on September 13, 2019
14 people found this helpful
Report
Jerami Brigden
5.0 out of 5 stars Instant hot water in compact size
Reviewed in Canada on February 21, 2024
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Jerami Brigden
5.0 out of 5 stars Instant hot water in compact size
Reviewed in Canada on February 21, 2024
I purchased the 13kw unit to try out a low budget hydronic in floor heating system. I didn't have much room to work with so this unit worked perfectly. I'm only running just shy of 3gpm through it at 110 degrees f with an inlet to outlet difference of less than 20 degrees f so this thing is perfect. Happy with it so far, hopefully it holds up the way I'm using it.
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Gboy
5.0 out of 5 stars Works as advertised.
Reviewed in Canada on March 5, 2019
6 people found this helpful
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Ronald
4.0 out of 5 stars Not enough electrical instruction or plumbing hardware
Reviewed in Canada on December 3, 2022
One person found this helpful
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Amazon Customer
5.0 out of 5 stars Bon
Reviewed in Canada on June 25, 2023