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All-in-one Rheem 685335 - Rtex-18 Professional Classic Tankless Electric Water Heater, 18 Kw, 240 Volts Tool [gTxSqkLP]

$45.99 $147.99 -69%

Professional Classic® tankless electric water heaters offer continuous hot water quick and on demand for single point-of-use or multiple applicationsPerformance FeaturesOn demand, consistent and endless hot waterCompact and stylish with digital tempe

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

Performance 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 (Average Gallons Per Minute (GPM) based on 2010 Plumbing Standards)


Warranty

  • 5-Year heating chamber and 1-year parts limited warranty. See Residential Warranty Certificate for complete information


Unique Features:

  • External Digital Thermostatic Control with LED display (+/- 1 degree accuracy)

  • Most advanced self-modulation, adjust power to meet hot water demand

  • Durable Copper Immersion two heating elements, field serviceable

  • Simple Installation - Bottom 3/4" NPT water connections













































































































Weight 14.8 Pounds (Lb)
Length 19.8 Inches (In)
Width 16.8 Inches (In)
Height 6.8 Inches (In)
Country of Origin CHN
Brand Rheem
Tier RTEX
Voltage 240 VAC
Amps 75
Phase Single
Cycle/Hertz 60 Hz
Certifications ETL Listed to UL 499 and CSA
Composition Brass, Copper
Connection Size 3/4
Connection Type Threaded
Fuel Type Electric
Maximum Pressure (PSI) 150
Maximum Temperature 140°F (60°C)
Number of Elements 1
Type Tankless - Electric
Warranty Offered Yes
Watts 18000
Wire Gauge 8 AWG
Energy Star Rated No
UL Listed Yes
Product Family RTEX

What Our Customers Say

January 16, 2026

Absolutely no complaints!

A brilliant piece of engineering.

- George King.

January 16, 2026

Absolutely no complaints!

The product is a marvel of modern design.

- Eva Martinez.

January 16, 2026

Absolutely no complaints!

Two thumbs up from me!

- Gary Thompson.

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