--- product_id: 724817007 title: "Rheem RTEX-18 18kW 240V Electric Tankless Water Kettle, Small, Gray" brand: "rheem" price: "€ 1632.32" currency: EUR in_stock: true category: "Rheem" url: https://www.desertcart.hr/products/724817007-rheem-rtex-18-18kw-240v-electric-tankless-water-kettle-small store_origin: HR region: Croatia --- # 18kW high power output 4.4 GPM flow rate for steady hot water ±1°F precise digital temp control Rheem RTEX-18 18kW 240V Electric Tankless Water Kettle, Small, Gray **Brand:** rheem **Price:** € 1632.32 **Availability:** ✅ In Stock ## Summary > 🔥 Instant Hot Water, Zero Wait — Upgrade Your Flow Game! ## Quick Answers - **What is this?** Rheem RTEX-18 18kW 240V Electric Tankless Water Kettle, Small, Gray by rheem - **How much does it cost?** € 1632.32 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/724817007-rheem-rtex-18-18kw-240v-electric-tankless-water-kettle-small) ## 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 - • **Power That Adapts:** Self-modulating technology adjusts energy use dynamically, saving you up to 50% on heating costs. - • **Space-Smart Design:** Compact and wall-mountable, this unit is 90% smaller than traditional tanks—perfect for modern living spaces. - • **Endless Hot Water Flow:** Delivers up to 4.4 gallons per minute, ensuring no more cold showers or waiting around. - • **Precision at Your Fingertips:** External LED display with ±1°F accuracy lets you dial in your perfect temperature every time. - • **Effortless Installation & Maintenance:** Easy 3/4" NPT water connection and simple screw replacement make setup and upkeep a breeze. ## Overview The Rheem RTEX-18 is a high-efficiency 18kW electric tankless water heater designed for mid-range home use. Featuring precise digital temperature control with LED display, self-modulating power technology, and a compact wall-mount design, it delivers up to 4.4 GPM of endless hot water while saving up to 50% on energy costs. Ideal for single or multiple point applications, this durable unit offers easy installation and maintenance, making it a smart upgrade for modern households seeking space-saving and cost-effective hot water solutions. ## Description This tankless electric water heater is ideal for the entire mid-range home use. This unit is ideal for Midwest single shower applications. The Rheem Performance Tankless Electric Water Heater provides endless water supply for continued use. The lower kilowatt unit can be used to supply hot water as needed for single or multiple use point applications. Meanwhile, higher kilowatts units can provide warm water to the entire house depending on the groundwater temperature at the entrance. Tankless electric water heater saves space, saves energy, saves money, and does not require airflow. The sleek and compact size is 90% smaller than the tank, so you can save space and place the unit anywhere you want. Tankless unit draws energy only when hot water flows, but traditional tanks always consume energy and keep the water in the tank at the desired temperature. Rheem self-modulating technology helps you save up to 50% on water heating costs ## Features - External digital temperature regulation control with LED display (+/-1 degree accuracy) - State-of-the-art self-modulation, adjusts power to meet your hot water requirements - Durable copper impregnated with 2 heating elements, available in the field Flow Rate: Up to 4.4 GPM - EASY INSTALLATION - 3/4" NPT water connection on the bottom - Easy to replace screw, easy to install, digital temperature display ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01MR7Z39V | | Brand Name | Rheem | | Capacity | 18 Gallons | | Color | gray | | Customer Reviews | 4.2 4.2 out of 5 stars (2,032) | | Efficiency | 99.8% | | Flow Rate | 4.4 Gallons Per Minute | | Global Trade Identification Number | 00020352685335 | | Heat Output | 18 Kilowatts | | Included Components | Fittings, Aerator | | Is Electric | Yes | | Item Depth | 18.25 inches | | Item Dimensions W x H | 36.8W x 46.4H cm | | Item Weight | 6.7 kg | | Manufacturer | Rheem | | Manufacturer Part Number | RTEX-18 | | Material Type | Iron | | Maximum Pressure | 150 Pound per Square Inch | | Maximum Temperature | 140 Degrees Fahrenheit | | Model Number | RTEX-18 | | Mount Type | Wall | | Power Source | AC Power | | Special Features | LED Display | | Style Name | Whole Home 18kw | | UPC | 020352685335 | | Unit Count | 1.0 Count | | Voltage | 240 Volts | | Wattage | 18000 W | ## Product Details - **Brand:** Rheem - **Capacity:** 18 Gallons - **Power Source:** AC Power - **Product Dimensions:** 36.8W x 46.4H cm - **Special Feature:** LED Display ## Images ![Rheem RTEX-18 18kW 240V Electric Tankless Water Kettle, Small, Gray - Image 1](https://m.media-amazon.com/images/I/91J18WlAKqL.jpg) ![Rheem RTEX-18 18kW 240V Electric Tankless Water Kettle, Small, Gray - Image 2](https://m.media-amazon.com/images/I/91+--nit2uL.jpg) ![Rheem RTEX-18 18kW 240V Electric Tankless Water Kettle, Small, Gray - Image 3](https://m.media-amazon.com/images/I/81+NX7Lb71L.jpg) ![Rheem RTEX-18 18kW 240V Electric Tankless Water Kettle, Small, Gray - Image 4](https://m.media-amazon.com/images/I/616uuS+hD9L.jpg) ![Rheem RTEX-18 18kW 240V Electric Tankless Water Kettle, Small, Gray - 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. ## 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.hr/products/724817007-rheem-rtex-18-18kw-240v-electric-tankless-water-kettle-small](https://www.desertcart.hr/products/724817007-rheem-rtex-18-18kw-240v-electric-tankless-water-kettle-small) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-07-21*