---
product_id: 38503297
title: "240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY"
brand: "rheem"
price: "221819 Ft"
currency: HUF
in_stock: true
reviews_count: 9
category: "Rheem"
url: https://www.desertcart.hu/products/38503297-240v-heating-chamber-rtex-13-residential-tankless-water-heater-gray
store_origin: HU
region: Hungary
---

# 13kW powerful heating Up to 4.8 GPM flow rate ±1°F precise digital control 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY

**Brand:** rheem
**Price:** 221819 Ft
**Availability:** ✅ In Stock

## Summary

> 🔥 Upgrade to the future of hot water—smart, sleek, and endlessly efficient!

## Quick Answers

- **What is this?** 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY by rheem
- **How much does it cost?** 221819 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/products/38503297-240v-heating-chamber-rtex-13-residential-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

- • **Compact & Sleek Wall-Mount:** Space-saving 8.25"W x 12.62"H design fits seamlessly into modern homes and apartments.
- • **Easy Installation, Pro-Grade:** Includes 1/2" NPT adapters and compression fittings for a smooth, hassle-free setup.
- • **Energy Efficiency That Saves:** 99.8% energy efficient—cut utility bills while reducing your carbon footprint in style.
- • **Instant Hot Water, Zero Wait:** Tankless design delivers endless hot water on demand—never run out during your busiest mornings.
- • **Precision Temperature Control:** External LED display with ±1°F accuracy lets you dial in your perfect comfort level effortlessly.

## Overview

The Rheem RTEX-13 is a 240V, 13kW residential tankless water heater featuring a durable copper immersion heating element, precise external digital thermostat with LED display, and a maximum flow rate of 4.8 GPM. With 99.8% energy efficiency and compact wall-mount design, it provides continuous hot water on demand while saving space and energy. Ideal for single or multiple point-of-use applications, it offers professional-grade performance with easy installation.

## Description

Professional classic® tankless electric water heaters offer continuous hot water quick and on demand for single point-of-use or multiple applications

Review: Flintstones to The Jetsons. - These systems are amazing. The future is in your hand when you hold one. I fully recommend. Please, however read on to understand them better. Customer support is awesome and available. This 13kw unit worked in my home I went thru two of the 18kw units that would not work. Please read on. You will want one and never look back. These WH’s are complicated. They work awesome in the lab environment they were created in. If your home does not match that lab setting or you can’t recreate it. It will not work. I went thru three of them. YOU WILL NEED. Flow restrictions, preasesure regulators, water softener, filters(?), and a lot of patience tuning it to work. Once tuned however, they are flawlessly perfected at heating water instantly. Wow! the future is in these devices. Why was mine so difficult? I’m the last house from the power company. Literally at the end of the line. And I put in the 18kw unit. They are all super easy to install in both wiring and plumbing, but, what appeared to be my problem was there wasn’t enough physical energy to run it properly. Duel 40 amp req. So it wouldn’t work unless the flow restriction was almost closed. I tweeted and tweeted every possible measure to get it to work. I’m on well water so that incoming cold temperature affects the system and set up on a 40/60. The water rate It was moving was to fast and I never could get both sides of the water heater on. It just would NOT work. It would come on for a sink at half open but when you tried to shower. It would turn off and say E5. Oh how I grew to hate that display. A simple to read display and simple to adjust temperature dial. I literally went from Flintstones to The Jetsons in appearance. About this 13kw unit. WHICH SOLVED MY PROBLEM. It’s a little more than half the power necessary to function. Single 50 amp It is doing its job beautifully now. I have almost full water pressure again and it seems sold at 130 deg. But again, several hours spent tuning so it did work. If the flow rate is to high and water temperature to low it will not work. You have to tune them with additional devices to stabilize them so that units performance in the lab environment it was created in and it needs. I have replaced two tanks now. One electric in a home and one propane in a camper. Worth it!
Review: Awesome thing, and literally produces hot water to no end🤌🏻 - If you can run the correct wire, this thing works great! I love it. I live by myself, but this thing runs my whole house. I dont necessarily try to over due it, but it runs the washing machine, the sink, and the shower. Maybe not necessarily all at the same time, but it does 2 of the 3 for sure. And there has been times when I was running all 3 at the same time, but it wasn't very long. Still did it though

## Features

- External adjustable digital thermostatic control with LED display (+/1 degree accuracy
- Durable Copper immersion two heating elements, field Serviceable.Self-modulating power control
- Simple installation – 1/2 NPT adapters included; side 1/2 inch Compression water connections
- 99.8% energy efficient. External controls to adjust temperature in increments of 1°f. Water-Saver Shower Head – 1.5 GPM
- Threaded for easy replacement, simple installation, digital temperature display 54 A. 13kW Model Flow Rate: up to 3.17 GPM
- 54 A

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01NAUZJPE |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #59,815 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #80 in Water Heaters |
| Brand | Rheem |
| Color | Gray |
| Customer Reviews | 4.3 4.3 out of 5 stars (1,360) |
| Date First Available | January 19, 2017 |
| Efficiency | at least 99.8% energy efficient |
| Global Trade Identification Number | 00020352685328 |
| Heat Output | 13 Kilowatts |
| Included Components | Rheem RTEX-13 Residential Tankless Water Heater |
| Is Discontinued By Manufacturer | No |
| Is Electric | Yes |
| Item Depth | 0.5 inches |
| Item Package Quantity | 1 |
| Item Weight | 3.96 pounds |
| Item model number | RTEX-13 |
| Manufacturer | Rheem |
| Maximum Flow Rate | 4.8 Gallons Per Minute |
| Maximum Temperature | 140 Degrees Fahrenheit |
| Mounting Type | Wall |
| Part Number | RTEX-13 |
| Product Dimensions | 8.25"W x 12.62"H |
| Size | Compact |
| Special Feature | LED Display |
| Special Features | LED Display |
| Style | Heater |
| Thickness | 1 Inches |
| UPC | 020352685328 |
| Voltage | 240 Volts |
| Wattage | 13 KW |

## Product Details

- **Brand:** Rheem
- **Capacity:** 1.5 Gallons
- **Power Source:** Electric
- **Product Dimensions:** 8.25"W x 12.62"H
- **Special Feature:** LED Display

## Images

![240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY - Image 1](https://m.media-amazon.com/images/I/31ivMdN84FL.jpg)

## Questions & Answers

**Q: How many amps are needed for rheem rtex - 13 240v heating tankless electric water heater**
A: Hello-The RTEX-13 requires 1x 60A@240V breaker / 6 AWG recommended wire size.Specs - http://cdn.globalimageserver.com/fetchdocument-rh.aspx?name=Specification-Sheet&id=fc3235b7-7cd0-42cd-93bc-7169ea92be31 Rheem 800-432-8373I hope this helped :)Ben

**Q: Do these tankless water heaters require an overflow line to the outside of the home or a pan like is required on normal water heaters ?**
A: No tank, so, no overflow line required. It mounts on the wall. A pan is needed if required by building code in your city.

**Q: We have a 500sq' apt. 1 kitchen sink, 1 lav sink and tub/shower. This tankless heats water to both sinks but nothing to the tub/sh. Help**
A: Sinks have aerators to slow down the water where a tub doesn't. It sounds like one possibility is that your exceeding the GPM for this heater. Next possibility, double check an measure your actually getting at least 240v at the heater, I had an issue where my unit was only getting 235v an it was causing a similar issue where only one of the two heating elements was activating. I had it set to 125F but it was coming out 100F. It was warm and without a meter I would of thought it was working correctly until I tried filling a tub. It couldn't even get the water warm. 
I pulled my wires out an restripped an cut an screwed them in an it fixed my problem, now its measuring around 245v. Make sure there is no copper showing after screwing down your input wires.

Now filling the tub I noticed after about 10-15 seconds the water gets too hot to touch. I set it to 135F.

**Q: El titan n270 me puede alimentar 3 baños y agua caliente en toda la casa.**
A: Solo tengo un baño y me sirve muy bien el calentador. Mi casa es pequeña. I'm sorry.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Flintstones to The Jetsons.
*by B***R on December 6, 2025*

These systems are amazing. The future is in your hand when you hold one. I fully recommend. Please, however read on to understand them better. Customer support is awesome and available. This 13kw unit worked in my home I went thru two of the 18kw units that would not work. Please read on. You will want one and never look back. These WH’s are complicated. They work awesome in the lab environment they were created in. If your home does not match that lab setting or you can’t recreate it. It will not work. I went thru three of them. YOU WILL NEED. Flow restrictions, preasesure regulators, water softener, filters(?), and a lot of patience tuning it to work. Once tuned however, they are flawlessly perfected at heating water instantly. Wow! the future is in these devices. Why was mine so difficult? I’m the last house from the power company. Literally at the end of the line. And I put in the 18kw unit. They are all super easy to install in both wiring and plumbing, but, what appeared to be my problem was there wasn’t enough physical energy to run it properly. Duel 40 amp req. So it wouldn’t work unless the flow restriction was almost closed. I tweeted and tweeted every possible measure to get it to work. I’m on well water so that incoming cold temperature affects the system and set up on a 40/60. The water rate It was moving was to fast and I never could get both sides of the water heater on. It just would NOT work. It would come on for a sink at half open but when you tried to shower. It would turn off and say E5. Oh how I grew to hate that display. A simple to read display and simple to adjust temperature dial. I literally went from Flintstones to The Jetsons in appearance. About this 13kw unit. WHICH SOLVED MY PROBLEM. It’s a little more than half the power necessary to function. Single 50 amp It is doing its job beautifully now. I have almost full water pressure again and it seems sold at 130 deg. But again, several hours spent tuning so it did work. If the flow rate is to high and water temperature to low it will not work. You have to tune them with additional devices to stabilize them so that units performance in the lab environment it was created in and it needs. I have replaced two tanks now. One electric in a home and one propane in a camper. Worth it!

### ⭐⭐⭐⭐⭐ Awesome thing, and literally produces hot water to no end🤌🏻
*by S***N on October 25, 2025*

If you can run the correct wire, this thing works great! I love it. I live by myself, but this thing runs my whole house. I dont necessarily try to over due it, but it runs the washing machine, the sink, and the shower. Maybe not necessarily all at the same time, but it does 2 of the 3 for sure. And there has been times when I was running all 3 at the same time, but it wasn't very long. Still did it though

### ⭐⭐⭐⭐⭐ Game Changer
*by S***S on October 1, 2024*

We installed the Rheem 240V Heating Chamber RTEX-13 Tankless Water Heater, and it has completely transformed our buildings hot water system! Pros: Endless Hot Water: This unit provides a continuous supply of hot water, which is perfect for our busy buildings. No more waiting for a tank to refill! Energy Efficient: The on-demand heating means we only use energy when we need hot water, resulting in noticeable savings on our utility bills. Compact Design: Its compact size allows for easy installation in tight spaces, which is a major plus in our buildings. User-Friendly Controls: The digital temperature display and adjustable settings make it easy to customize the water temperature to everyone's liking. Reliable Performance: We’ve had no issues with temperature fluctuations, and it maintains a consistent flow even during peak usage times. Overall, we highly recommend the Rheem RTEX-13 for anyone looking to upgrade to a tankless water heater. It’s efficient, reliable, and has made a significant difference in our daily routine!

## Frequently Bought Together

- Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
- HYDRO MASTER Tankless Water Heater Service Valve Kit with Pressure Relief Valve 3/4-Inch IPS Isolator Clean Brass
- Waterdrop AP431 AP430SS Whole House Scale Inhibitor Filter, Heater Softener System, Prevent Scale Build Up On Hot Water Heaters, Pipes and Boilers

---

## 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.hu/products/38503297-240v-heating-chamber-rtex-13-residential-tankless-water-heater-gray](https://www.desertcart.hu/products/38503297-240v-heating-chamber-rtex-13-residential-tankless-water-heater-gray)

---

*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-01-29*