Brand | Rheem |
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Product Dimensions | 8.25"W x 12.63"H |
Special Feature | LED Display |
Color | Gray |
Wattage | 11 KW |
Voltage | 240 Volts |
Maximum Flow Rate | 2.68 Gallons Per Minute |
Heat Output | 11 Kilowatts |
Style | Water Heater |
Maximum Operating Pressure | 150 |
Maximum Pressure | 150 Pound per Square Inch |
Mounting Type | Wall |
Is Electric | Yes |
Manufacturer | Rheem |
UPC | 020352685380 |
Manufacture Year | 2023 |
Global Trade Identification Number | 00020352685380 |
Part Number | RTEX-11 |
Item Weight | 7.04 pounds |
Country of Origin | China |
Item model number | RTEX-11 |
Is Discontinued By Manufacturer | No |
Finish | Stainless Steel |
Shape | Rectangle |
Installation Method | Wall Mount |
Item Package Quantity | 1 |
Special Features | LED Display |
Usage | Inside; Professional |
Included Components | Fittings, Aerators |
Batteries Included? | No |
Batteries Required? | No |

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Rheem 11kW 240V Tankless Electric Water Heater
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Return this item for free
We offer easy, convenient returns with at least one free return option: no shipping charges. All returns must comply with our returns policy.
Learn more about free returns.- Go to your orders and start the return
- Select your preferred free shipping option
- Drop off and leave!
Purchase options and add-ons
Brand | Rheem |
Product Dimensions | 8.25"W x 12.63"H |
Special Feature | LED Display |
Color | Gray |
Wattage | 11 KW |
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About this item
- ON/OFF Dial Control with adjustable digital temperature display
- Self-modulating power control
- 11kW Model Flow Rate: up to 2.68 GPM
- Side 1/2" NPT water connections
- On demand, consistent and continuous hot water
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From the manufacturer


Rheem Tankless Electric Water Heaters
Enjoy continuous hot water so you can do the dishes, wash the laundry, give the pets a bath and still have hot water for a relaxing shower.
Key Benefits
Saves Energy
Heats water only when you need it, so it uses less energy than a tank-type water heater, making this a sustainable choice.
Saves Money
Compared to a tank-type water heater, you could save up to 50% on water heating costs with point-of-use tankless electric water heaters or up to 34% with whole home models according to the Department of Energy (DOE).
Saves Water
When tankless electric point-of-use water heaters are installed close to where you need hot water, less water is wasted down the drain while waiting on hot water to reach the tap.
Saves Space
Point-of-use Rheem tankless electric models are compact, allowing them to be installed near a fixture (under a sink, in a bathroom or closet) freeing up valuable storage space in your home. Whole home models can be installed on the wall in a central home location.

Additional Benefits
- Powerful Performance – Our RTEX 24kW model provides up to 5.9 gallons of hot water per minute (GPM) in warm climates, enough for up to 2 showers and 2 sinks at once. Lower kW models also provide continuous hot water at lower flow rates (from 0.9 to 4.4 (GPM).
- Energy Smart – RTEX models 8, 11, 18 & 24 utilize energy modulation, so they only use the amount of power required to heat the water you need.
- On-Demand Hot Water – Point-of-use models, RTEX 4, 6, & 8 are installed near where you need hot water, so you get hot water fast.
- Optimized Operation – Digital temperature control on the front of each model allows easy set point adjustment (RTEX-04 and RTEX-06 models display outlet temperature only).
- No Venting - Tankless electric water heaters do not require venting, so they can be installed anywhere inside the home.
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Customer Reviews |
2.3 out of 5 stars 10
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4.0 out of 5 stars 16
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4.0 out of 5 stars 349
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4.1 out of 5 stars 384
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4.3 out of 5 stars 1,920
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4.3 out of 5 stars 774
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Price | $187.99$187.99 | $189.00$189.00 | $204.08$204.08 | $269.00$269.00 | $421.19$421.19 | $518.93$518.93 |
GPM (Max.) | up to 0.9 | up to 1.6 | up to 1.95 | up to 2.68 | up to 4.4 | up to 5.9 |
Power Source | 120V Electric | 240V Electric | 240V Electric | 240V Electric | 240V Electric | 240V Electric |
Kilowatt (Max.) | 3.5 kW | 6.5 kW | 8 kW | 11 kW | 18 kW | 24 kW |
Fixtures Served (Max.) | 1 Sink | 2 Sinks | 3 Sinks | 1 Shower, 2 Sinks | 2 Showers | 2 Showers, 2 Sinks |
Height | 5-7/8" | 5-7/8" | 12-5/8" | 12-5/8" | 18-1/4" | 18-1/4" |
Width | 10-7/8" | 10-7/8" | 8-1/4" | 8-1/4" | 14-1/2" | 17-5/8" |
Depth | 2-3/4" | 2-3/4" | 3-5/8" | 3-5/8" | 3-1/2" | 3-1/2" |
Ship Wt. | 4 Lbs | 4 Lbs | 7 Lbs | 8.5 Lbs | 14.78 Lbs | 17.8 Lbs |
Water Connections | 1/2" NPT | 1/2" NPT | 1/2" NPT | 1/2" NPT | 3/4" NPT | 3/4" NPT |
Breakers Required | (1 x 30)AMP | (1 x 30)AMP | (1 x 40)AMP | (1 x 50)AMP | (2 x 40)AMP | (3 x 40)AMP |
From the brand

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A History of Comfort
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 only manufacturer in the world that produces heating, cooling, water heating, pool & spa heating and commercial refrigeration products, and it is the largest manufacturer of water heating products in North America.
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Tankless Gas Water Heaters
Enjoy the comfort and convenience of continuous hot water. Available in both indoor and outdoor models, Rheem tankless gas water heaters are loaded with features to help you save money and reduce water waste. And these ultra low NOx tankless solutions are up to 96% efficient to reduce energy costs, too.
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Tankless Gas Water Heaters
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Tankless Electric Water Heaters
Enjoy the comfort and convenience of continuous hot water on demand with a Rheem tankless electric water heater. Our electric models are great for homes with busy families, homes with luxury bathrooms and vacation homes, while our point-of-use electric models are ideal for a single faucet or shower.
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Tankless Electric Water Heater
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Featured Product - RTGH-3
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What We Supply
Enjoy the comfort and convenience of continuous hot water. Available in both indoor, outdoor, gas or electric models, Rheem tankless water heaters are loaded with features to help you save money and reduce water waste. Rheem tankless solutions are up to 96% efficient to reduce energy costs.
Sustainability
For nearly 100 years, Rheem has been a leader in water heating innovation. We continue to lead with our bold approach to improvements for our products and processes to dramatically cut our impact on the environment, while empowering our customers live sustainably.
Videos
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See how I installed it at home - Rheem 11kW
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Must WATCH ! What you should know before buying
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See How This Water Heater Conserves Energy
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Product information
Technical Details
Additional Information
ASIN | B01N35V1HH |
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Customer Reviews |
4.1 out of 5 stars |
Best Sellers Rank | #28,951 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #29 in Water Heaters |
Date First Available | January 19, 2017 |
Warranty & Support
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Rheem 11kW 240V Tankless Electric Water Heater
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Product Description
The Rheem Perfomance RTEX-11 is an 11 kW tankless electric water heater ideal for point-of-use applications. This unit is great for a point-of-use application, Rheem tankless electric water heaters offer a continuous, endless supply of hot water. A lower kilowatt unit can provide hot water on demand for single or multiple point-of-use applications while a higher kilowatt unit could provide hot water for a whole house depending on the inlet ground water temperature. Tankless electric water heaters save space, save energy, save money, and require no venting. The sleek, compact size, 90 percent smaller than a tank, allows you to save space and place the unit wherever you want, including under a sink. Tankless units only draw energy when hot water is flowing, while traditional tanks are constantly drawing energy to keep the water in the tank at the desired temperature.
Top Brand: Rheem
Compare with similar items
This Item Rheem 11kW 240V Tankless Electric Water Heater | Recommendations | |||||
Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | |
Price | $269.00$269.00 | $189.00$189.00 | $299.99$299.99 | $219.99$219.99 | -10% $179.99$179.99 Typical: $199.99 | -21% $229.99$229.99 List: $289.99 |
Delivery | Get it as soon as Wednesday, Mar 19 | Get it as soon as Wednesday, Mar 19 | Get it as soon as Sunday, Mar 23 | Get it as soon as Wednesday, Mar 19 | Get it as soon as Wednesday, Mar 19 | Get it as soon as Wednesday, Mar 19 |
Customer Ratings | ||||||
Sold By | Amazon.com | Amazon.com | Senville | ECOTOUCH | Camplux | Westinghouse Home Comfort Direct |
capacity | 2.68 gallons | 1.4 gallons | — | 14 kilowatts | — | — |
power source | ['ac'] | ac dc | — | Corded Electric | ac | Corded Electric |
mounting type | Wall | Wall | — | Wall | Wall | Wall |
maximum pressure | 150 pounds per square inch | 150 pounds per square inch | — | — | 150 pounds per square inch | — |
material | Stainless Steel | — | — | Aluminum | Aluminum | Housing material is iron |
style | Water Heater | Indoor Installation | Indoor Installation | Indoor Installation | 11kW | 14kW |
Important information
11 KW
240 volts
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers appreciate the water heater's heat level, functionality, and ease of installation. They find it works well for single showers and small households. Many customers praise the quality and durability of the product. The sink size and energy efficiency are also praised. However, some customers have differing opinions on the water flow rate and how quickly it gets hot.
AI-generated from the text of customer reviews
Customers like the water heater's heat level. They mention it provides hot water quickly, even in winter. The water heater is easy to install and set the temperature. It works well for them, providing endless hot showers with an outstanding warranty.
"...It heats the water within seconds and it is so much more energy efficient than our old unit which is constantly heating 50 gallons...." Read more
"Very good hot water heater! Has a heat adjuster and works perfectly!" Read more
"This is an AWSOME water heater so far. I am using it for a studio/in-law apartment above my 3car garage...." Read more
"...Now I'm stuck with a used Rheem Tankless water heater that doesn't work. I'LL NEVER BUY ANY RHEEM PRODUCT AGAIN...." Read more
Customers like the water heater's functionality. They say it works well for a single shower, is easy to install, and runs great. It works wonderfully in the summertime and has just enough power in the winter.
"We have been using this unit for over a month and it works great...." Read more
"Very good hot water heater! Has a heat adjuster and works perfectly!" Read more
"Works great but would recommend the next step up if you have a tub." Read more
"...small Rheem Tankless water heater I ordered on May 3, 2023 quit working one year later...." Read more
Customers find the water heater easy to install. They mention it works well and that the connections have options. Hooking the #6 wire was straightforward.
"...steel braided flex lines for inlet and outlet lines, that made install easy...." Read more
"Installed one year ago, and we have no issues. Ours is working great!" Read more
"Great value and easy to install ! Saves money on the electric bills too by not running constantly!" Read more
"Item arrived quickly. Easy to install, I bought this Rheem to replace a similar lesser known brand of on demand water heater that quit working after..." Read more
Customers appreciate the water heater's quality. They say it runs well for a year and a half, but is only good for two years. The plastic material is easily breakable when installed.
"...Saves money on the electric bills too by not running constantly!" Read more
"Rheem makes a high quality product. I've owned several. The biggest challenge is always determining which size model will be adequate...." Read more
"A high quality unit. Runs off one 50A breaker. Not much water throughput. Can just run one shower with low flow shower head...." Read more
"...The difference- Rheem's quality, and the adjustable temp to 140°F. For a small household, this is all you need...." Read more
Customers appreciate the water heater's small size. They find it suitable for small bathrooms and kitchen sinks, especially if the pipe length is short. It provides hot water for showers, bathroom sinks, and kitchen sinks without any issues.
"...are always looking for simple ways to live better and this fit right into that equation...." Read more
"...It supplies a shower, bathroom sink and kitchen sink without a problem...." Read more
"Fast and efficient for tiny home under 580 square foot." Read more
"...Let me just say that this model is PLENTY for our kitchen sink...." Read more
Customers appreciate the water heater's energy efficiency. They say it works well, is small, and has enough power for quick hot water.
"...It heats the water within seconds and it is so much more energy efficient than our old unit which is constantly heating 50 gallons...." Read more
"...wonderfully in the summertime, and in the winter, it has just enough power. I can run the water at any rate, and it heats it appropriately...." Read more
"...Looking forward to the energy savings I'm supposed to get.." Read more
"Small, efficient and works great. Quick hot water." Read more
Customers have different views on the water flow. Some say it has a low-flow shower head, which is good for the environment, and can regulate the water flow. Others report issues like the water flow stopping, not much water throughput, and it cannot handle normal water pressure.
"...I can run the water at any rate, and it heats it appropriately. It feels just like I'm using a tank-style water heater. My last one DID NOT." Read more
"A high quality unit. Runs off one 50A breaker. Not much water throughput. Can just run one shower with low flow shower head...." Read more
"...A low flow shower head, which is a good thing for the environment anyhow, and endless hot showers are yours with an outstanding warranty to boot!..." Read more
"Needs low flow show heads to work effectively. No rain shower heads." Read more
Customers have different views on the water heater's flow rate. Some find it fast and efficient for small homes under 580 square feet, while others say it's not suitable for tub baths and has a low flow rate. Overall, opinions vary on whether the water heater provides good performance or not.
"Fast and efficient for tiny home under 580 square foot." Read more
"...Unfortunately, t's performance was very little better, if any, than that of the 8kW unit. I am very disappointed with Rheem and their products!" Read more
"...The really good feature is that you can run a very slow flow and this rig still regulates the temperature well...." Read more
"...There's no way around it... meaning, 'instant' isn't really instant...." Read more
Reviews with images

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Top reviews from the United States
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- Reviewed in the United States on September 2, 2024Style: Water HeaterVerified PurchaseWe have been using this unit for over a month and it works great. It heats the water within seconds and it is so much more energy efficient than our old unit which is constantly heating 50 gallons. I feel like the whole world needs to go to these and leave the dinosaur hot water units in the past. We are always looking for simple ways to live better and this fit right into that equation. We only have one bathroom so the 11v is plenty for our needs. If you are supplying hot water to multiple places at once then you may consider a larger unit. If you can manage your use to varied times a smaller unit would likely still serve you well. Doing our part to save resources!
- Reviewed in the United States on January 22, 2025Style: Water HeaterVerified PurchaseVery good hot water heater! Has a heat adjuster and works perfectly!
- Reviewed in the United States on May 17, 2024Style: Water HeaterVerified PurchaseThe small Rheem Tankless water heater I ordered on May 3, 2023 quit working one year later. I immediately went online and purchased the exact same unit again, planning to return and get a refund on the old one once it was removed and the new one replaced. When I contacted Rheem to get a return authorization and refund, they said they would not take it back and I should keep it and use it for replacement parts! REALLY? That was the most ridiculous thing I've ever heard. They said I should have called when the old one quit working so they could troubleshoot over the phone. I barely know where my water heater is located and certainly was not prepared to crawl around under the sink to figure out why their defective product quit working. I simply called the plumber to remove the old one (just 1 year old) and replace it with the new one I'd ordered. Now I'm stuck with a used Rheem Tankless water heater that doesn't work. I'LL NEVER BUY ANY RHEEM PRODUCT AGAIN. If that's how their customer service responds, in the future I will go with another manufacturer who stands behind their product without excuses!
- Reviewed in the United States on June 22, 2024Style: Water HeaterVerified PurchaseThis is an AWSOME water heater so far. I am using it for a studio/in-law apartment above my 3car garage. It supplies a shower, bathroom sink and kitchen sink without a problem. I used stainless steel braided flex lines for inlet and outlet lines, that made install easy. I does require allot of power , 60 amp breaker and # 6 wire so just be aware of that before purchasing. I have a 200 amp service so that was not a problem for me. As long as it lasts it is a great buy for the money.
- Reviewed in the United States on November 7, 2024Style: Water HeaterVerified PurchaseWorks great but would recommend the next step up if you have a tub.
- Reviewed in the United States on October 14, 2024Style: Water HeaterVerified PurchaseIf your water heater is a long way off plumbing-wise then you know how long, aggravating, and wasteful it is to run the tap till you get hot water.
This unit provides *warm* water after about 7-8 seconds and is fully heated after 15 seconds vs. the nearly two minutes we used to wait. I lollygagged for three years before I finally bought one of these on-demand heaters.
Only thing is these on-demand heaters need a dedicated 240 Volt 60 A circuit and uses 6 ga wiring. You aren't plugging this thing into any regular outlet. Wire this thick, stranded of course, was still quite difficult to get connected to the interior terminals due to having to bend to fit inside the unit. But once installed it's doing what I wanted.
- Reviewed in the United States on January 6, 2025Style: Water HeaterVerified PurchaseInstalled one year ago, and we have no issues. Ours is working great!
- Reviewed in the United States on March 12, 2025Style: Water HeaterVerified PurchaseMore like buy 5 at once and learn how to swap them yourself. These things are kind of junk. I go through about 1-2 a year. This was the first winter it didn't die on me, but probably because I just replaced it last summer. Last one would make the hot water black occasionally, the ones before that would stop heating the water unless it was super low pressure.
I get the best life out of them by minimizing the usage time. I.e. only do one of these at a time; shower/washing dishes/doing laundry. If doing 2 at once, and the weather is like 20 degrees outside, thing's gonna need to be replaced.
Top reviews from other countries
- AlexReviewed in Canada on December 15, 2023
5.0 out of 5 stars works great but to toooo.. expensive
Style: Water HeaterVerified Purchaseworks great but to tooo.. expensive
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Cesar PaezReviewed in Mexico on March 19, 2021
1.0 out of 5 stars No lo recomiendo
Style: Water HeaterVerified PurchaseMuy mal producto. No cumplió con lo esperado. Jamás calentó lo suficiente.
- k ZweersReviewed in Canada on June 3, 2024
4.0 out of 5 stars Hot water when you want it
Style: Water HeaterVerified PurchaseSecond try at a tankless. First was too small but this unit works great. Happy purchase