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RHEEM Professional Classic 18 kW Tankless Electric Water Heater 240 Volts RTEX-18
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- Free shipping — most items ship by the next day
Licensed HVAC technician required. Must be installed by a certified professional. Improper installation voids the manufacturer warranty.
Secure payment
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RHEEM Professional Classic 18 kW Tankless Electric Water Heater 240 Volts RTEX-18
Licensed HVAC technician required. Must be installed by a certified professional. Improper installation voids the manufacturer warranty.
Need help? (888) 292-0874
- Free shipping — most items ship by the next day
Secure payment
VISA MC AMEX DISC PayPal Affirm CHECK
In stock
In most items, small items ship same day. Complete systems ship next business day.
-
Need help? (888) 292-0874
- Free shipping — most items ship by the next day
Secure payment
VISA MC AMEX DISC PayPal Affirm CHECK
Not sure this fits your unit?
Call us with your model number and we'll confirm the right part before you order.
RHEEM Professional Classic 18 kW Tankless Electric Water Heater 240 Volts RTEX-18
Professional Classic tankless electric water heaters offer continuous hot water quick and on demand for single point-of-use or multiple applications.
FEATURES
On demand, consistent and endless hot water
Compact and stylish with digital temperature control in increments of 1°F ranging from 80°F to 140°F*
99.8% Energy efficient
Robust copper immersion heating elements with brass top increases durability and are threaded for easy replacement
Simple Installation
Digital temperature display
External controls to adjust temperature in increments of 1°F*
APPLICATIONS
Whole-Home – up to 6 GPM
Water-Saver Shower Head – 1.5 GPM
Standard Shower Head – 2.0 GPM
Standard Hand Sink – 0.5 GPM
Kitchen Sink – 1 to 2 GPM
Bath Tub – >= 4 GPM
Dishwasher – 1 to 2 GPM
Washing Machine – 1 to 1.5 GPM
DIMENSIONS
Height: 6.75
Length: 14.78
Width: 16.75
Why homeowners choose NAW
Genuine OEM parts
Every part we sell is the real thing — authorized, factory-genuine, and backed by the full manufacturer warranty.
Easy online ordering
Find your part by model number, add to cart, and get it delivered to your door — no middleman, no markup.
30-day hassle-free returns
Ordered the wrong part? Send it back within 30 days.
Help when you need it
Not sure if this is the right part? Call us at (888) 292-0874 and we’ll help you find the correct replacement.
Customer reviews
What buyers are saying
Verified reviews from customers who purchased this product.
5.0
5 verified reviews
DF
Derek F
The 18KW Rheem Electric Tankless Water Heater exceeded all my expectations with its amazing performance and efficiency! It provides endless hot water at an unbeatable price, making it a must-have for anyone looking to upgrade their home’s water heating system.
JF
James F
I recently purchased the 18KW Rheem Electric Tankless Water Heater and was blown away by its remarkable performance and surprisingly affordable price. The sleek design and powerful heating capabilities ensure endless hot water on demand, making it an absolute game-changer for my home!
DN
Dominick N
I recently purchased the 18KW Rheem Electric Tankless Water Heater, and the exhilarating surprise of its unbeatable price, coupled with the exceptional quality of the equipment and its outstanding performance, has turned this acquisition into an absolute win that far exceeded my expectations!
KT
Kolton T
I recently purchased the 18KW Rheem Electric Tankless Water Heater, and I’m thrilled with the incredible price, compact size, and outstanding performance that have turned my daily showers into a luxurious experience while saving on energy costs—truly a surprising and fantastic addition to my home.
M
Mark
This 18KW Rheem Electric Tankless Water Heater is a true home comfort marvel! The price for such an efficient and powerful water heater is remarkably affordable, and its consistent delivery of instant hot water left me pleasantly surprised. For anyone seeking an energy-efficient and dependable water heating solution at an incredible value, this heater is a fantastic choice!
