--- product_id: 54112092 title: "Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray" brand: "rheem" price: "€ 668.02" currency: EUR in_stock: true category: "Rheem" url: https://www.desertcart.ie/products/54112092-rheem-rtex-24-24kw-240v-electric-tankless-water-heater-gray store_origin: IE region: Ireland --- # 24kW high power output 5.9 GPM continuous flow 93% smaller footprint Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray **Brand:** rheem **Price:** € 668.02 **Availability:** ✅ In Stock ## Summary > 🔥 Never run out of hot water again—power, precision, and space-saving style in one sleek unit! ## Quick Answers - **What is this?** Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray by rheem - **How much does it cost?** € 668.02 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-Smart Design:** Compact size saves up to 93% space compared to traditional heaters—ideal for modern living. - • **Powerhouse Performance:** Delivers a robust 24kW output for uninterrupted hot water, perfect for whole-home use. - • **Future-Ready Installation:** Requires 3 x 40 AMP breakers and 200 AMP service—built for homes that demand high performance. - • **Energy Efficiency Champion:** 99.8% energy efficient, cutting costs and environmental impact with zero standby heat loss. - • **Precision Temperature Control:** Adjust water temperature in 1-degree increments from 80°F to 140°F with an intuitive LED display. ## Overview The Rheem RTEX-24 is a 24kW, 240V electric tankless water heater delivering 5.9 gallons per minute of continuous hot water. Its compact design is up to 93% smaller than traditional models, featuring precise digital temperature control and 99.8% energy efficiency. Designed for whole-home use, it requires a 200 AMP household service and triple 40 AMP breakers, making it a powerful, space-saving, and cost-effective upgrade for modern homes. ## 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. ## 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 | | Best Sellers Rank | #10,996 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Water Heaters | | Brand Name | Rheem | | Capacity | 5.9 gallons | | Color | Gray | | Customer Reviews | 4.2 4.2 out of 5 stars (4,054) | | Efficiency | 99.8% Energy efficient | | Flow Rate | 5.9 Gallons Per Minute | | Global Trade Identification Number | 00020352685397 | | Heat Output | 24 Kilowatts | | Included Components | Fittings, Aerators | | Is Electric | Yes | | 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 Pound per Square Inch | | Maximum Temperature | 140 Degrees Fahrenheit | | Model Number | RTEX-24 | | Mount Type | Wall | | Power Source | Corded Electric | | Special Features | LED Display | | Style Name | Whole Home, 24 kw | | UPC | 020352685397 | | Unit Count | 1.0 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) ![Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray - Image 2](https://m.media-amazon.com/images/I/91kjnZtLt2L.jpg) ![Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray - Image 3](https://m.media-amazon.com/images/I/8174CmMnmwL.jpg) ![Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray - Image 4](https://m.media-amazon.com/images/I/61PCrI8GdkL.jpg) ![Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray - Image 5](https://m.media-amazon.com/images/I/71LH0jtHwnL.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. ## Frequently Bought Together - Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray - HYDRO MASTER Tankless Water Heater Service Valve Kit with Pressure Relief Valve 3/4-Inch IPS Isolator Clean Brass - CMI Inc - 3/4 Inch Tankless Water Heater Isolation Service Valve with Pressure Relief Valve – Female to Female Connection – Flush Kit for Gas & Electric Models, PEX Core --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ie/products/54112092-rheem-rtex-24-24kw-240v-electric-tankless-water-heater-gray](https://www.desertcart.ie/products/54112092-rheem-rtex-24-24kw-240v-electric-tankless-water-heater-gray) --- *Product available on Desertcart Ireland* *Store origin: IE* *Last updated: 2026-07-18*