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Rheem

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

  • Based on 805 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Friday, Aug 8
Order within 3 hours and 16 minutes
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Features

  • ON/OFF Dial Control with adjustable digital temperature display
  • Self-modulating power control
  • 24kW Model Flow Rate: up to 5.9 GPM for RTEX-24
  • Bottom 3/4" NPT water connections
  • On demand, consistent and continuous hot water

Description

The Professional Classic Tankless Electric RTEX-24 240 V is engineered to provide continuous hot water on demand, making it ideal for both single point- of-use and multiple applications, with a remarkable flow rate of 5.9 GPM. Its compact design is up to 93% smaller than traditional electric water heaters, allowing for significant space savings, while its energy-efficient operation eliminates standby heat loss when installed near the point-of-use.

Brand: Rheem


Product Dimensions: 17.63"W x 18.25"H


Special Feature: LED Display


Color: Gray


Wattage: 24 KW


Brand: ‎Rheem


Product Dimensions: ‎17.63"W x 18.25"H


Special Feature: ‎LED Display


Color: ‎Gray


Wattage: ‎24 KW


Voltage: ‎240 Volts


Maximum Flow Rate: ‎5.9 Gallons Per Minute


Heat Output: ‎24 Kilowatts


Efficiency: ‎99.8% Energy efficient


Style: ‎Water Heater


Maximum Operating Pressure: ‎150


Maximum Pressure: ‎150 Pound per Square Inch


Mounting Type: ‎Wall


Is Electric: ‎Yes


Manufacturer: ‎Rheem


Item Depth: ‎3.5 inches


UPC: ‎020352685397


Global Trade Identification Number: ‎97


Part Number: ‎RTEX-24


Item Weight: ‎17.8 pounds


Country of Origin: ‎China


Item model number: ‎RTEX-24


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


Date First Available: January 19, 2017


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Aug 8

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Tankless Hot Water install
Style: Water Heater
I replaced a 55 gallon hot water tank with this unit, I bought a little larger unit than what the ratings said I needed to be safe. Make sure you check your electrical panel to make sure you have room for 3 x 40 double pole 40 amp circuit breakers. I didn’t have enough room, had to add a sub panel plus had to run 9 x 8 gauge wires the unit requires. I’m pretty handy, but asked a certified electrician to help me with the pre wiring. To be honest, I would have been afraid to try and do this myself even with all my experience. Installation was pretty simple after you have the wiring installed. Use 1 inch piping from your electrical panel to the tankless electrical unit or you won’t be able to pull the nine 8 gauge wires through the pipe. I also suggest having an electrical panel with a main breaker so you don’t have to shut the whole house down for the final install. Additionally i installed a surge protector to hopefully protect the unit from power surges which appears to have delicate electronics inside. We’ve only had this unit in operation for 4 days so far, but the water is really hot, have had no issues at this point and I love the added space gained without having the tank. Time will tell if we save 50% on energy, but from all my research it makes sense even with us living in a warm climate. There are several tankless unit manufacturers with great ratings, I went with Rheem because if I have an issue, they are based in the USA and hopefully that means English speaking in my time zone….. Hope my review is helpful to you. ... show more
Reviewed in the United States on May 6, 2025 by Amazon Customer
    • Can't complain for the price, works well
Style: Water Heater
So let me begin this by saying that I purchased this off Amazon warehouse for a discounted price of $171. After tax and shipping it came out to $188. This is drastically lower than the price home Depot or Lowe's would offer of nearly $600 plus tax. So when my water heater went out, and I was looking for a quick fix I searched tankless water heater on Amazon and found this. I recently had installed one of these at a friend's house, they got the largest option for the Rheem tankless water heater. The install at their house did not go well. The first unit that we got I installed, and it did not work. I thought it was something I did and spent hours troubleshooting just to find out that the board on the unit, which was brand new, was bad. So we exchanged and got another one and it installed just fine. Plugged it in and it works That said, I wasn't sure what to expect and was hoping for a better situation this time. And a better situation is what I got. I had no problems installing this unit, it's set up very easily and worked exactly as intended. I could not be happier! It is a small compact unit and it heats very quickly. I will update this when the first bill comes if it is outrageous. But I can't imagine it would be. The system seems to work well, and I'm confident that it will continue to do so. ... show more
Reviewed in the United States on January 30, 2024 by Kyle
    • DIY'ERS NEED TO KNOW
Style: Water Heater
Functionality: I know this might sound like.. duh.. but make sure you have enough electricity running to your home. Ie.. amp service. I have 200 amp service and it is barely enough. Well... not really enough. 120 amps when hot water is running. 60 amps when hot tub is running. Stove, Dryer, A/C. I have never really worried about all of that before. But now if the AC kicks on when the hot tub is running and the wife is doing laundry.. hot water is running and so is dryer.. the dryer will not heat up. Or the water won't. Just not enough juice. Just something to think about. God forbid if we get an electric car.. ... show more
Reviewed in the United States on June 30, 2025 by Covingtonschaffer
    • Useless Product: Total waste of money
Style: Water Heater
I was so excited to get this product - I had read nothing but good reviews, heard great things about the company and was thrilled to get it as a gift for the house for the Holidays. Unfortunately - it is one of the worst products I have ever purchased and I hope I save at least one other human from making the same horrible mistake that my family did. It does not heat water consistently, so while using it there are constant bursts of hot and cold water. Worst of all, it does not heat enough the water for us to be able to take baths anymore, which was the entire reason we got this product in the first place. Customer support was a joke. Because we installed it after Christmas, we missed the return window via Amazon, and the solution from Rheem involves hiring another plumber AGAIN to install something else, which isn't even guaranteed to work. I have never regretted upgrading an appliance more in my life, or buying something. I would give anything to be able to take a bath in my home right now. They should be ashamed to sell this product. ... show more
Reviewed in the United States on February 13, 2024 by J Devi
    • It works well.
Style: Water Heater
It takes 60 wats divided into 30 watts separately
Reviewed in the United States on May 22, 2025 by Arely

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