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Gas Tankless
Water Heater
The PH2-25ROF will support up to 2-3 major hot water functions in a warm climate, but is not recommended for installation in climates where freezing is possible. It can also be converted for commercial use up to 185°F with the simple addition of a hi-temp computer chip.
All gas tankless water heaters are available in Natural Gas (N) and Liquid Propane (P) models.


  • Residential & Commercial Applications
  • 0.26GPM Minimum Flow Rate / 0.4 GPM Activation
  • Integrated Appliance Adapter & Condensate Drain To Simplify Venting On Indoor Direct Vent Models
  • Supports both Horizontal & Vertical Venting
  • Wired Temperature Remote Control Included
  • Connect Up To 20 Units In Tandem
  • High Altitude Capable
  • Self Diagnostic System
  • Supplied 120V Power Cord On IndoorDirect Vent Models
  • Freeze Protected To -30°F
  • Low NOx burner
  • Accepts Preheated Water Up To 140°F
  • Made In Japan


  • 12 Year Warranty on Heat Exchanger*
  • 5 Year Warranty on Parts*
  • 1 Year Warranty on Service*



  • ICAD
    Incomplete Combustion Avoidance Device Monitors Combustion For Evidence Of Unsafe Carbon Monoxide
  • Overheat Limit Wrap
    Resin Film Surrounds The Combustion Chamber, Detecting Overheating
  • Flame Failure Monitor
    Flame Rods Ensure Proper Firing & Detect Flame Failure
  • Anti-Scald Protection
    Temperature Controller Can be Adjusted To Prevent Scalding


  • Digital Controller
    Changes Temperature Settings Immediately & Precisely With The Touch Of A button, And Functions As A Diagnostic Display
  • Endless Hot Water
    Never Run Out Of Hot Water Again

* For residential applications. Commercial warranty is 5 year, 5 year, 1 year