---
product_id: 724816964
title: "Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater"
brand: "rheem"
price: "41431 som"
currency: KGS
in_stock: false
reviews_count: 5
url: https://www.desertcart.kg/products/724816964-rheem-rtex-18-240v-2-heating-chambers-residential-tankless-water
store_origin: KG
region: Kyrgyzstan
---

# 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:** 41431 som
**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?** 41431 som with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/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: Great product, have been using ours for 2 years and it works great.
Review: 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 |
|---------------|-------|
| Special Feature | Energy Efficient, Space Saving |
| Colour | Silver |
| Wattage | 18000 Watts |
| Voltage | 240 Volts |
| Maximum Flow Rate | 4.4 Gallons Per Minute |
| Heat Output | 18 Kilowatts |
| Efficiency | High Efficiency |
| Mounting Type | Wall |
| Is Electric | Yes |
| Manufacturer | Rheem |
| UPC | 020352685335 |
| Global Trade Identification Number | 00020352685335 |
| Item model number | RTEX-18 |
| Product Dimensions | 46.99 x 36.83 x 8.89 cm; 6.7 kg |
| ASIN | B01MR7Z39V |

## 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/413AtC2RwvL.jpg)
![Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater - Image 2](https://m.media-amazon.com/images/I/41N2livaKhL.jpg)
![Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater - Image 3](https://m.media-amazon.com/images/I/41rSZEMYuAL.jpg)
![Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater - Image 4](https://m.media-amazon.com/images/I/41tGuWwpeDL.jpg)
![Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater - Image 5](https://m.media-amazon.com/images/I/51hVbPj6YsL.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

### ⭐⭐⭐⭐⭐ Review
*by B***K on 10 August 2025*

Great product, have been using ours for 2 years and it works great.

### ⭐⭐⭐⭐⭐ Review
*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

### ⭐⭐⭐⭐⭐ Review
*by A***R on 1 April 2022*

The unit was easy to install and I use the existing hot water tank as a preheat tank. We are on a well and the water is very cold coming up out of the ground, so I set the tank at minimum and it heats the well water to roughly ambient temperature. My gas bill has dropped by 70% and my electric bill has only risen about 3%. This is the only way to go!

## Frequently Bought Together

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**Shop now:** [https://www.desertcart.kg/products/724816964-rheem-rtex-18-240v-2-heating-chambers-residential-tankless-water](https://www.desertcart.kg/products/724816964-rheem-rtex-18-240v-2-heating-chambers-residential-tankless-water)

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-01-29*