---
product_id: 54112092
title: "Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray"
brand: "rheem"
price: "€ 682.80"
currency: EUR
in_stock: true
reviews_count: 8
category: "Rheem"
url: https://www.desertcart.ie/products/54112092-rheem-rtex-24-24kw-240v-electric-tankless-water-heater-gray
store_origin: IE
region: Ireland
---

# 24 kW power output 5.9 GPM max flow rate Compact 17.63"W x 18.25"H size Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

**Brand:** rheem
**Price:** € 682.80
**Availability:** ✅ In Stock

## Summary

> 🔥 RTEX-24: Power your home with endless hot water, minus the bulk! ⚡

## Quick Answers

- **What is this?** Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray by rheem
- **How much does it cost?** € 682.80 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/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:** Up to 93% smaller than traditional tanks—perfect for modern minimalist homes.
- • **Endless Hot Water, Zero Wait:** Continuous flow means no more cold showers or running out of hot water.
- • **Pro-Grade Power Requirements:** Requires 3 x 40 AMP breakers & 200 AMP service—built for serious home performance.
- • **Precision Temperature Control:** Adjust in 1-degree increments from 80°F to 140°F with an intuitive LED display.
- • **Energy Efficiency That Pays Off:** 99.8% efficient with no standby heat loss—save on bills while staying comfortable.

## Overview

The Rheem RTEX-24 is a professional-grade, tankless electric water heater delivering 24 kW of power and up to 5.9 gallons per minute of continuous hot water. Its compact wall-mounted design saves up to 93% space compared to traditional tanks, featuring precise digital temperature control from 80°F to 140°F. With 99.8% energy efficiency and no standby heat loss, it’s engineered for whole-home use requiring a 200 AMP household service and 3 x 40 AMP breakers. Ideal for millennials seeking a sleek, efficient upgrade that guarantees endless hot water on demand.

## 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: Rheem tankless water heater - Love this tankless heater, it works great! Never run out of hot water while showering! There's only 2 of us in our home so not sure how it would work with a family but I'm sure a bigger size or maybe another mounted where hot water is needed most?? Would definitely buy again!!
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.

## Features

- ELECTRICAL REQUIREMENTS: 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. RTEX-24 model is 100A, 24kw, 240V.
- PROVEN PERFORMANCE: Continuous hot water when you need it for the whole home (review performance guide image to confirm this water heater will provide the hot water needed based on geographic location). Ground water temperature impacts temperature rise and gallons per minute.
- EASILY ADJUSTABLE: ON/OFF Dial Control with adjustable digital temperature display allows for adjustments in 1-degree increments from 80-140 degrees F.
- EFFICIENT: Tankless electric water heaters save space, energy, money, and require no venting.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01MS9DVEE |
| Amperage | 100 Amps |
| Best Sellers Rank | #4,714 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Water Heaters |
| Brand | Rheem |
| Color | Gray |
| Customer Reviews | 4.2 4.2 out of 5 stars (3,926) |
| Date First Available | January 19, 2017 |
| Efficiency | 99.8% Energy efficient |
| Global Trade Identification Number | 00020352685397 |
| Heat Output | 24 Kilowatts |
| Is Discontinued By Manufacturer | No |
| Is Electric | Yes |
| Item Depth | 3.5 inches |
| Item Weight | 17.8 pounds |
| Item model number | RTEX-24 |
| Manufacturer | Rheem |
| Manufacturer Part Number | RTEX-24 |
| Maximum Flow Rate | 5.9 Gallons Per Minute |
| Maximum Operating Pressure | 150 |
| Maximum Temperature | 140 Degrees Fahrenheit |
| Model | Professional Classic Tankless Electric RTEX-24 |
| Mounting Type | Wall |
| Product Dimensions | 17.63"W x 18.25"H |
| Special Feature | LED Display |
| Special Features | LED Display |
| Style | Whole Home, 24 kw |
| UPC | 020352685397 |
| 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

### ⭐⭐⭐⭐⭐ Rheem tankless water heater
*by J***X on January 31, 2026*

Love this tankless heater, it works great! Never run out of hot water while showering! There's only 2 of us in our home so not sure how it would work with a family but I'm sure a bigger size or maybe another mounted where hot water is needed most?? Would definitely buy again!!

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Tankless Hot Water install
*by A***R on May 6, 2025*

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. Update: it’s been 7 months, still works great, very happy with this decision even though I can say I’ve seen significant energy savings

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-17*