will this supply two showers, washer and dishwasher for two people? (1000 sf house)

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

Paperwork says it requires four 40 amp breakers or two DP 40 amp breakers. Max draw of 75 amps.

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?

Yes you could even go with the unit rtex-15 one smaller if that's it. Good luck

how many breakers and what amp.

The RTEX-18 (240 Volt) requires (2) 40 amp breakers and 8 AWG wire.

Rheem Rtex 18 18kw 240v Electric Tankless Water Kettle Small

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

51205691₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vietnam.

Secure transaction

Description

🔥 Heat Smarter, Live Better — Never Run Out, Never Waste Energy!

SMART ENERGY SAVER - Self-modulating technology adjusts power dynamically, cutting water heating costs by up to 50%.
SPACE SMART DESIGN - Compact and sleek, this unit is 90% smaller than traditional tanks—perfect for modern minimalist homes.
ENDLESS HOT WATER FLOW - Delivers up to 4.4 gallons per minute, ideal for single or multiple mid-range household applications.
PRECISION AT YOUR FINGERTIPS - External digital LED display with ±1°F accuracy lets you customize comfort effortlessly.
EFFORTLESS INSTALLATION MAINTENANCE - 3/4" NPT bottom water connection and easy-to-replace heating elements make setup and upkeep a breeze.

The Rheem RTEX-18 is a powerful 18kW 240V electric tankless water heater designed for efficient, on-demand hot water delivery. Featuring precise digital temperature control with LED display, advanced self-modulating technology for energy savings, and a compact footprint that fits seamlessly into modern homes, it provides up to 4.4 GPM flow rate—perfect for single shower or mid-range household use. Easy to install and maintain, this unit offers endless hot water while reducing energy consumption by up to 50% compared to traditional tank heaters.

Specifications

ASIN	B01MR7Z39V
Brand	Rheem
Brand Name	Rheem
Capacity	18 Gallons
Color	gray
Customer Reviews	4.3 out of 5 stars 2,019 Your Review
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
Product Dimensions	36.8W x 46.4H cm
Special Feature	LED Display
Special Features	LED Display
Style Name	Whole Home 18kw
UPC	020352685335
Unit Count	1.0 Count
Voltage	240 Volts
Wattage	18000 W

Reviews

A**R

Awesome, works great!

1.04.2022

J**V

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

8.12.2023

A**O

Buen producto

Es buen producto, solo la instalción se complica por el cableado electrico que debe ser calibre 8 y que los interruptores deben ser dobles por el tema de 220V. Por lo demas puedo comentar que el agua se calienta rapido, se mantiene a buena temperatura (ajustable),

19.03.2022

D**Y

Works well.

22.04.2026

E**E

Es lo de hoy, fuera gas, fuera depósitos

Excelente equipo

14.03.2024

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ravi S.

I loved the variety of products available. Will definitely shop again.

2 months ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

51205691₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vietnam.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago