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RTEX-18 Professional Classic Series


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 continuous 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



  • Standard Hand Sink – 0.5 GPM
  • Washing Machine – 1 to 1.5 GPM
  • Kitchen Sink – 1 to 2 GPM
  • Dishwasher – 1 to 2 GPM
  • Water-Saver Shower Head – 1.5 GPM
  • Standard Shower Head – 2.0 GPM
  • Bath Tub – = 4 GPM


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


Unique Features

  • External Digital Thermostatic Control with LED display (+/- 1 degree accuracy)
  • Most advanced self-modulation, adjust power to meet hot water demand
  • Two durable Copper Immersion heating elements, field serviceable
  • Simple Installation – Bottom 3/4″NPT water connections



  • 5-Year heating chamber and 1-year

parts limited warranty


 RTEX-18 4.4
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