--- product_id: 724816964 title: "Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater" brand: "rheem" price: "1008.86 DT" currency: TND in_stock: false reviews_count: 5 url: https://www.desertcart.tn/products/724816964-rheem-rtex-18-240v-2-heating-chambers-residential-tankless-water store_origin: TN region: Tunisia --- # 18 kW high power output 4.4 GPM max flow rate 90% smaller footprint Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater **Brand:** rheem **Price:** 1008.86 DT **Availability:** ❌ Out of Stock ## Summary > 🔥 Compact power, endless comfort — heat smarter, live better! ## Quick Answers - **What is this?** Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater by rheem - **How much does it cost?** 1008.86 DT with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/724816964-rheem-rtex-18-240v-2-heating-chambers-residential-tankless-water) ## 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 and sleek, fits discreetly under sinks or tight spaces. - • **Energy Smart Savings:** Self-modulating tech cuts your water heating bill by up to 50%. - • **Powerful & Efficient:** 18 kW output delivers instant heat with high efficiency. - • **Endless Hot Water On Demand:** Never run out of hot water during your busiest mornings. - • **Easy Wall Mount Installation:** Saves floor space and blends seamlessly into your home. ## Overview The Rheem RTEX-18 is a 240V electric tankless water heater delivering 18 kW of high-efficiency heat with a maximum flow rate of 4.4 gallons per minute. Its compact design is 90% smaller than traditional tanks, enabling flexible wall-mount installation and significant space savings. Featuring self-modulating technology, it reduces energy consumption by up to 50%, providing endless hot water on demand for single or multiple point-of-use applications. ## Description This tankless electric water heater is ideal for mid-range whole-home applications. This unit is ideal for single shower applications in the Midwest. The Rheem Performance 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. Rheem's self-modulating technology can save Up to 50 percent on your water heating bill. Review: Works well. - So far this has worked well saves on electricity takes maybe 30 seconds to heat up and then I jump into the shower. Review: Buen producto - Bastante cumplidor aun para lo que yo esperaba ya que solo requiero una cantidad relativamente baja de agua caliente y da bastante mas de lo esperado, totalmente recomendable ## Features - Energy Efficient, Space Saving ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01MR7Z39V | | Brand | Rheem | | Brand Name | Rheem | | Capacity | 18 Gallons | | Colour | Silver | | Customer Reviews | 4.2 out of 5 stars 2,031 Reviews | | Efficiency | High Efficiency | | Flow Rate | 4.4 Gallons Per Minute | | Global Trade Identification Number | 00020352685335 | | Heat Output | 18 Kilowatts | | Is Electric | Yes | | Item Weight | 6.7 kg | | Manufacturer | Rheem | | Manufacturer Part Number | RTEX-18 | | Model Number | RTEX-18 | | Mount Type | Wall | | Power Source | Corded Electric | | Special Feature | Energy Efficient , Space Saving | | Special Features | Energy Efficient, Space Saving | | Style Name | Indoor Installation | | UPC | 020352685335 | | Voltage | 240 Volts | | Wattage | 18000 Watts | ## Product Details - **Capacity:** 18 Gallons - **Colour:** Silver - **Power Source:** Corded Electric - **Special Feature:** Energy Efficient, Space Saving - **Wattage:** 18000 Watts ## Images ![Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater - Image 1](https://m.media-amazon.com/images/I/91J18WlAKqL.jpg) ![Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater - Image 2](https://m.media-amazon.com/images/I/91+--nit2uL.jpg) ![Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater - Image 3](https://m.media-amazon.com/images/I/81+NX7Lb71L.jpg) ![Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater - Image 4](https://m.media-amazon.com/images/I/616uuS+hD9L.jpg) ![Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater - Image 5](https://m.media-amazon.com/images/I/71LH0jtHwnL.jpg) ## Questions & Answers **Q: will this supply two showers, washer and dishwasher for two people? (1000 sf house)** A: Hello- Sizing an electric tankless is very difficult. I always recommend that you call Rheem at 800-432-8373 to get a suggestion. I want to say this will only keep up with ONLY 1 source of hot water at any one given time. That being said, the RTEX-18 performance ( @240V )- 1.5GPM - 82degree rise 2.0GPM - 62degree rise 2.5GPM - 49degree rise 3.0GPM - 41degree rise So.... what it can keep up with all depends on: -the temp of water coming into the house -the flow rate of each faucet/shower head/washing machine/source of hot water -outlet temp desired I hope this helped :) Ben **Q: How many amps** A: Paperwork says it requires four 40 amp breakers or two DP 40 amp breakers. Max draw of 75 amps. **Q: Rheem rtex-18 be big enough to heat water in my shop to wash my hands and perhaps take a shower in kansas city, mo?** A: Yes you could even go with the unit rtex-15 one smaller if that's it. Good luck **Q: how many breakers and what amp.** A: The RTEX-18 (240 Volt) requires (2) 40 amp breakers and 8 AWG wire. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works well. *by D***Y on 22 April 2026* So far this has worked well saves on electricity takes maybe 30 seconds to heat up and then I jump into the shower. ### ⭐⭐⭐⭐⭐ Buen producto *by J***V on 8 December 2023* Bastante cumplidor aun para lo que yo esperaba ya que solo requiero una cantidad relativamente baja de agua caliente y da bastante mas de lo esperado, totalmente recomendable ### ⭐⭐⭐⭐⭐ Tankless water heater *by P***O on 3 May 2026* Great system, easy to install. Was a 1/2 day project but over all I'm very pleased on the outcome. The temperature is very easy to set and instant hot on demand was a plus. I did have to add a sub panel ## Frequently Bought Together - Rheem 18kW 240V Tankless Electric Water Heater, Gray - HYDRO MASTER Tankless Water Heater Service Valve Kit with Pressure Relief Valve 3/4-Inch IPS Isolator Clean Brass - 3/4 Inch IPS Isolator Tankless Water Heater Service Valve Kit with Pressure Relief Valve, Clean Brass, 3/4 Inch Service Installation Valve for rheem,rinai,ecosmart,navien,noritz,takagi,bosch --- ## 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.tn/products/724816964-rheem-rtex-18-240v-2-heating-chambers-residential-tankless-water](https://www.desertcart.tn/products/724816964-rheem-rtex-18-240v-2-heating-chambers-residential-tankless-water) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-09-07*