---
product_id: 54112092
title: "Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray"
brand: "rheem"
price: "4537.59 DT"
currency: TND
in_stock: true
reviews_count: 13
category: "Rheem"
url: https://www.desertcart.tn/products/54112092-rheem-rtex-24-24kw-240v-electric-tankless-water-heater-gray
store_origin: TN
region: Tunisia
---

# 24kW high power output 5.9 GPM flow rate 93% smaller footprint Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

**Brand:** rheem
**Price:** 4537.59 DT
**Availability:** ✅ In Stock

## Summary

> 🔥 Power up your home with endless hot water — no tank, no limits!

## Quick Answers

- **What is this?** Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray by rheem
- **How much does it cost?** 4537.59 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/54112092-rheem-rtex-24-24kw-240v-electric-tankless-water-heater-gray)

## Best For

- rheem enthusiasts

## Why This Product

- Trusted rheem brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Space-Savvy Design:** Compact size saves up to 93% space compared to traditional heaters—perfect for modern homes.
- • **Instant Hot Water, Zero Wait:** On-demand heating delivers continuous, consistent hot water exactly when you need it.
- • **Built to Last with Confidence:** Durable stainless steel construction backed by a limited lifetime warranty ensures long-term reliability.
- • **Energy Efficiency at Its Best:** 99.8% energy efficient with self-modulating power control to cut waste and lower bills.
- • **Precision Temperature Control:** Adjustable digital display and ON/OFF dial let you customize your perfect water temp with ease.

## Overview

The Rheem RTEX-24 is a 24kW, 240V electric tankless water heater delivering up to 5.9 gallons per minute of continuous hot water. Its compact design is 93% smaller than traditional models, saving space while providing 99.8% energy efficiency. Featuring a digital temperature display, self-modulating power control, and durable stainless steel build, it’s engineered for reliable, on-demand performance with a limited lifetime warranty.

## Description

The Professional Classic Tankless Electric RTEX-24 240V 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. See performance guide for average expectations in your region based on ground water temperature and application usage. 3 x 40 AMP Double Pole Breakers Required. 200 AMP Household service recommended. Ensure your home can accomodate the power supply and that enough space is available in your breaker panel for this unit.

Review: If you know what you're getting, you'll love it! - There are many factors to consider before buying an electric tankless heater. By far the most important -- at least for me -- is whether the ground water temperature in your area is consistently warm enough to give the water heater a chance to succeed. I live in North Central Florida where the groundwater temperature is a rock-solid 72F (~22C) year-round. This is the ideal setup for tankless electrics; if you are far north this heater will likely fall short at the exact worst time, i.e. when it's winter and you could really use a nice, hot shower. I recommend looking closely at the map provided on Rheem's website and product pages to determine if this product is right for you. Second caveat, if you have a natural gas hookup, it is worth researching whether a gas-powered unit would be more efficient and/or less costly. There are considerations beyond this, of course, but those are the key ones that will determine whether you will be a happy camper or have cold water poured on those dreams of long, hot showers. If you're still considering after reading the above, then the short of it is (drumroll) ... I'm very satisfied and fully recommend making the jump to tankless! Here's the long-winded version: There is about 25- to 30-feet of pipe to travel between the water heater and the showerhead in my bathroom, and it takes about 25 seconds (well, 22.93 ... yes, I used a stopwatch) for the shower water to reach max temp. I did not use a stopwatch on my tank heater, but I'd guestimate it takes about 10 seconds longer for the tankless to deliver hot water than the tank unit it replaced. The main benefit, again, is that the tankless will continue to deliver hot water indefinitely while the tank is finite -- so, no more playing beat the clock and if you get in the water and realize you forgot your razor or something. The temperature coming out of the showerhead lines up with the temperature on the digital display for the main shower. There is a slight, but noticeable (I'd say 2F-4F/1C-2C) drop from the maximum temperature for the shower furthest away from the water heater. There is enough overhead that you can crank it a few degrees higher -- just be sure your shower handle can settle on something that won't scald you if you go above the recommended! I can also verify that the throughput on the model I bought (24 kW) is enough to handle two showers running at the same as well as start a load of laundry on hot -- I'm sure it could handle more, but there's not a scenario I can imagine where I would need it to. All in all, the flow is as good or better than the water heater it replaced. The dimensions listed on the product page are accurate. As far as your monthly bill, this hasn't made a significant impact although it may in the future. Here's some data from my most recent utility bill compared to the same month last year. Keep in mind the following figures are the daily averages listed on my bill for the whole home, not just the heater, although it is the only major appliance we have replaced over the past 12 months. April 2025 = 33.90 kWh electric and 0.06 KGA water (whole-home daily average) April 2024 = 31.34 kWh electric and 0.03 KGA water (whole-home daily average) Based on the above info (and the prior two months), it's essentially a wash -- we're using more power but only because we're taking longer showers because we can actually enjoy the heat now rather than worrying whether we're leaving enough water for everyone else! I'm sure that our water usage will level out once the novelty wears off, but that might be a while :) Now for the elephant in the room: Installation. If you can't say right now, with confidence and without any further research, whether you could get away with a DIY install, I'll answer the question for you: No, you can't. The plumbing end of the equation is easy -- the only hard part was ditching the tank unit. Beyond that, all you will need is a few fittings and a little pipe to hook it all up, plus the proper hardware to secure it to the wall. Any homeowner who would be comfortable ripping out a vanity sink/faucet and installing a new one should be able to do this portion themselves. The electrical hookup is another story. First, you will need 200-amp service to make this viable; if you don't, save yourself the headache. Second, depending on the distance between your electrical box and your water heater, you may need to have an auxiliary breaker box installed, as we did. Just as water temperatures vary regionally, so do electrician's rates. In our area we paid $850 to have a licensed electrician and his journeyman knock it out -- it took them about three hours and that includes the cost of the pictured auxiliary box. I would expect that rate to be higher in major metros but hopefully it gives a ballpark for what you can expect to pay beyond the sticker price.
Review: All the hot water you need and more. - This is the fourth tankless we've owned. The first was destroyed in a fire and we still have the other two working at family cabins. First I want to point out some fundamental pros. It is small, the size of a suitcase while a tankked heater needs a lot of space. Secondly as long as you have power you never run out of hot water. With three boys in the house we'd run out of hot water with the tank heater, not so with the tankless. The third pro takes a while to notice,, Less electricity use = smaller bill. My average monthly bill was $120. it was $90 after the tankless was installed. The cons would be that if you lose power you have no hot water, but how often does that happen? Also are you needing hot water at the time IF it happens? Second con is the 24& 27KW units need Three double throw 40 amp breakers. and needs feeding with 8 gauge wire. They are whole house units. No you cannot just wire it on your tank heater line. A tank heater doesn't require "INSTANT" power as it uses lower power most ALL of the time. A tankles uses a lot of power ONLY when you need hot water. Most of the time it is off. I've read the low star ratings and it is fairly obvious that these persons did not do their research or read the manual. One complaint was the water only became warm. The person was using a 6kw unit for his full house. Those units are for low flow point of use. Use the correct sie for the intended usage and need! The last con observation is you will notice that it takes the same amount of time to get hot water out to the faucet as it does with a tank heater. The law of physicials and all.... The bottom line here is DO YOUR DUE DILIGENCE/RESEARCH so there are no surprises. The manufacturers tell you what it does and what you need to make it work. My conclusion is I Recommend this unit. When you get it PROPERLY installed it will work so well you will forget about it.

## Features

- Get the performance you expect. Choose the right size water heater for your home and verify electrical requirements before installation. When properly sized and professionally installed, Rheem Tankless Electric Water Heaters deliver reliable, on-demand hot water while saving valuable space.
- 24kW model provides up to 5.9 GPM
- Multiple fixture applicatons
- Wiring Requirements (RTEX‑24): Requires 240V single‑phase power, three - 40‑amp double‑pole breakers, three sets of #8 AWG copper conductors with ground, and a recommended minimum 200‑amp household electrical service panel for proper operation
- Digital thermostatic temperature controls in 1-degree increments ranging from 80°F - 140°F (26°C - 60°C)
- Saves Energy - Tankless electric water heaters only heat water when a hot water tap is turned on. By heating water only when needed elimantes energy used to maintain desired water temperature in standard tank water heaters.
- Save Space Without Sacrificing Hot Water - Compact design that frees up valuable floor space, 90% smaller than traditional tank water heaters
- No Venting required to operate, simplifying the installation process compared to a tankless gas water heater
- Warranty: 5-Year Leak, 1-Year Parts

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01MS9DVEE |
| Best Sellers Rank | #10,397 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Water Heaters |
| Brand | Rheem |
| Brand Name | Rheem |
| Capacity | 5.9 gallons |
| Color | Gray |
| Customer Reviews | 4.3 out of 5 stars 895 Reviews |
| Efficiency | 99.8% Energy efficient |
| Flow Rate | 5.9 gpm |
| Global Trade Identification Number | 00020352685397 |
| Heat Output | 24 KW |
| Included Components | Fittings, Aerators |
| Item Depth | 3.5 inches |
| Item Dimensions W x H | 17.63"W x 18.25"H |
| Item Type Name | Water Heater |
| Item Weight | 17.8 pounds |
| Manufacturer | Rheem |
| Manufacturer Part Number | RTEX-24 |
| Manufacturer Warranty Description | Limited lifetime warranty |
| Material Type | Stainless Steel |
| Maximum Pressure | 150 psi |
| Maximum Temperature | 140 °F |
| Model Number | RTEX-24 |
| Mount Type | Wall |
| Number of Items | 1 |
| Power Source | Corded Electric |
| Product Dimensions | 17.63"W x 18.25"H |
| Special Feature | LED Display |
| Special Features | LED Display |
| Style Name | Whole Home, 24 kw |
| UPC | 020352685397 |
| Unit Count | 1 Count |
| Voltage | 240 volts |
| Wattage | 24 KW |

## Product Details

- **Brand:** Rheem
- **Capacity:** 5.9 gallons
- **Power Source:** Corded Electric
- **Product Dimensions:** 17.63"W x 18.25"H
- **Special Feature:** LED Display

## Images

![Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray - Image 1](https://m.media-amazon.com/images/I/A1Xd-sywn+L.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Can this directly replace a 40 gal tank heater with a 30A double pole breaker? What are power requrements?**
A: No it can't. RTEX-24 requires 3 sets of wire and ground, and it needs 3x 40amp breaker.  That's a total of 120amps

**Q: Why are 2 answers for the breaker requirements. Is it 3 double 40 or 3 double 60 amp**
A: If the unit draws 40 amp. you need a 2 pole 40 amp breaker 2 #8 wires good for 40 amp and 1 # 10 wire for a bond. Now if the unit draws 60 amps you need 2 # 6's good for 65 amps. A 2 pole 60 amp breaker and 1 # 8 for a bond( ground wire).

**Q: Has anyone had a noticable difference in electric bill?**
A: Yes, reduced electricity by about 20%. But this thing sucks. It has trouble keeping up with water flow and is noisy.  Their support is atrocious. I would not recommend it. Select a different brand.

**Q: Can the unit operate as a rtex-18 if i only hook up 2 of the elements? because i only need the 18 specs as of now but would like the option to upgrade**
A: Actually you can do this but you must be careful on which circuits are connected. Rheem says the elements are activated from right to left as power is required. The right most element connection also provides power to the control so this must always be connected. If the very left element is left disconnected, you will only get 2/3 of the rated power on a 3 element unit.

## Customer Reviews

### ⭐⭐⭐⭐⭐ If you know what you're getting, you'll love it!
*by 2***W on May 27, 2025*

There are many factors to consider before buying an electric tankless heater. By far the most important -- at least for me -- is whether the ground water temperature in your area is consistently warm enough to give the water heater a chance to succeed. I live in North Central Florida where the groundwater temperature is a rock-solid 72F (~22C) year-round. This is the ideal setup for tankless electrics; if you are far north this heater will likely fall short at the exact worst time, i.e. when it's winter and you could really use a nice, hot shower. I recommend looking closely at the map provided on Rheem's website and product pages to determine if this product is right for you. Second caveat, if you have a natural gas hookup, it is worth researching whether a gas-powered unit would be more efficient and/or less costly. There are considerations beyond this, of course, but those are the key ones that will determine whether you will be a happy camper or have cold water poured on those dreams of long, hot showers. If you're still considering after reading the above, then the short of it is (drumroll) ... I'm very satisfied and fully recommend making the jump to tankless! Here's the long-winded version: There is about 25- to 30-feet of pipe to travel between the water heater and the showerhead in my bathroom, and it takes about 25 seconds (well, 22.93 ... yes, I used a stopwatch) for the shower water to reach max temp. I did not use a stopwatch on my tank heater, but I'd guestimate it takes about 10 seconds longer for the tankless to deliver hot water than the tank unit it replaced. The main benefit, again, is that the tankless will continue to deliver hot water indefinitely while the tank is finite -- so, no more playing beat the clock and if you get in the water and realize you forgot your razor or something. The temperature coming out of the showerhead lines up with the temperature on the digital display for the main shower. There is a slight, but noticeable (I'd say 2F-4F/1C-2C) drop from the maximum temperature for the shower furthest away from the water heater. There is enough overhead that you can crank it a few degrees higher -- just be sure your shower handle can settle on something that won't scald you if you go above the recommended! I can also verify that the throughput on the model I bought (24 kW) is enough to handle two showers running at the same as well as start a load of laundry on hot -- I'm sure it could handle more, but there's not a scenario I can imagine where I would need it to. All in all, the flow is as good or better than the water heater it replaced. The dimensions listed on the product page are accurate. As far as your monthly bill, this hasn't made a significant impact although it may in the future. Here's some data from my most recent utility bill compared to the same month last year. Keep in mind the following figures are the daily averages listed on my bill for the whole home, not just the heater, although it is the only major appliance we have replaced over the past 12 months. April 2025 = 33.90 kWh electric and 0.06 KGA water (whole-home daily average) April 2024 = 31.34 kWh electric and 0.03 KGA water (whole-home daily average) Based on the above info (and the prior two months), it's essentially a wash -- we're using more power but only because we're taking longer showers because we can actually enjoy the heat now rather than worrying whether we're leaving enough water for everyone else! I'm sure that our water usage will level out once the novelty wears off, but that might be a while :) Now for the elephant in the room: Installation. If you can't say right now, with confidence and without any further research, whether you could get away with a DIY install, I'll answer the question for you: No, you can't. The plumbing end of the equation is easy -- the only hard part was ditching the tank unit. Beyond that, all you will need is a few fittings and a little pipe to hook it all up, plus the proper hardware to secure it to the wall. Any homeowner who would be comfortable ripping out a vanity sink/faucet and installing a new one should be able to do this portion themselves. The electrical hookup is another story. First, you will need 200-amp service to make this viable; if you don't, save yourself the headache. Second, depending on the distance between your electrical box and your water heater, you may need to have an auxiliary breaker box installed, as we did. Just as water temperatures vary regionally, so do electrician's rates. In our area we paid $850 to have a licensed electrician and his journeyman knock it out -- it took them about three hours and that includes the cost of the pictured auxiliary box. I would expect that rate to be higher in major metros but hopefully it gives a ballpark for what you can expect to pay beyond the sticker price.

### ⭐⭐⭐⭐⭐ All the hot water you need and more.
*by P***L on March 12, 2023*

This is the fourth tankless we've owned. The first was destroyed in a fire and we still have the other two working at family cabins. First I want to point out some fundamental pros. It is small, the size of a suitcase while a tankked heater needs a lot of space. Secondly as long as you have power you never run out of hot water. With three boys in the house we'd run out of hot water with the tank heater, not so with the tankless. The third pro takes a while to notice,, Less electricity use = smaller bill. My average monthly bill was $120. it was $90 after the tankless was installed. The cons would be that if you lose power you have no hot water, but how often does that happen? Also are you needing hot water at the time IF it happens? Second con is the 24& 27KW units need Three double throw 40 amp breakers. and needs feeding with 8 gauge wire. They are whole house units. No you cannot just wire it on your tank heater line. A tank heater doesn't require "INSTANT" power as it uses lower power most ALL of the time. A tankles uses a lot of power ONLY when you need hot water. Most of the time it is off. I've read the low star ratings and it is fairly obvious that these persons did not do their research or read the manual. One complaint was the water only became warm. The person was using a 6kw unit for his full house. Those units are for low flow point of use. Use the correct sie for the intended usage and need! The last con observation is you will notice that it takes the same amount of time to get hot water out to the faucet as it does with a tank heater. The law of physicials and all.... The bottom line here is DO YOUR DUE DILIGENCE/RESEARCH so there are no surprises. The manufacturers tell you what it does and what you need to make it work. My conclusion is I Recommend this unit. When you get it PROPERLY installed it will work so well you will forget about it.

### ⭐⭐⭐⭐⭐ 6+ years still zero issues. Real Numbers
*by J***D on March 10, 2020*

UPUPDATE: 6/4/2025. Still all goo. Zero issues after 6 years. Nothing replaced. Electrical bill still the same as with the old tank version. UPDATE: 8/4/2021. All is great. No problems. Small change in lowering electric bill. Only bad is when power goes out no reserve hot water but a rare circumstance. Overall I feel like it was a good choice. Ok. Real world. This is for a Rheem RTEX-24 tankless water heater. Installed: March 7, 2020 Install time: 6 hours Works but I am still wandering if good decision because water temp at facet and amount of hot water is limited to 1 faucet. I am waiting on a new thermostat from Rheems great tech support. Pros: Small compared to water heater. Tech support is actually amazing. Will send parts at no cost and no proof of purchase. Cons: Intallation requires knowledge of installing breakers and running wire(I used AWG 6/2). Out put temp from unit says 140F but temp at faucets is 120F. It takes so much water and time to reach facets, over 1 minute compared to 28 seconds, on normal 50gal water tank at same distance. Called Rheem about water temp difference they are sending a new thermostat. Really good tech support. I am not an electrician or a plumber but have pretty extensive knowledge of both. Installation: I am replacing a 17 year old 50 Gallon standard Rheem tank. The tankless will be in the same location so distance and pipe can be compared after same location. I choose to run wire called AWG 6/2(50ft $94 at lowes) instead of the reccomend 8/2. I did this because most other tankless companies called for 6/2. This way if I needed to switch companies for $30 difference I was ready. Also you have to install 3 40Amp double-pole breakers in your breaker panel. These are similar to the breaker already on your current water heater or oven just the amp number on those is usually 50 amp. It takes up some good room in your panel, like 6 normal spots. After Install: So it works kinda. All voltage tests on elements are good. If you push the temp dial and hold it for 10 seconds a menu comes up. You can click the dial to 3 different numbers now (Flow amount, Outgoing Temp, incoming temp). I set the temp to 140F but can not get water at faucet above 122F. Also my incoming temp is 62F. So I should be able to get 3 faucets or 2 shower heads with a 54 degree rise with no problems. Rheem said this is very rare and is sending new thermostat free.

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-10-24*