Adapt™ Premium Condensing Ultra-Low NOx Tankless Water Heater with X3® Scale Prevention

Top Service Items     •    Additional Resources

A. O. Smith’s ADAPT™ premium condensing gas tankless water heaters deliver robust, on-demand performance and the flexibility to install in practically any residential setting. Easily add scale prevention protection by replacing the bypass cartridge with an optional X3 cartridge sold separately — which can make the heat exchanger last up to three times longer than a standard tankless water heater while maintaining like-new performance.


  • Features and Benefits



  • How It Works




  • Application and Installation




Top Service Items
  • Cartridge Installation
  • Error 111 Ignition Failure
  • Error 121 Loss of Flame
  • Error 991 Imperfect Combustion

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Additional Resources

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