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Model RS25 Steam Humidifier

GFI#: 5547

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Replace your cylinder 1-2 times per season


  • Gallons per day:  25-35 
  • Capacity (pounds per hour):  12
  • Power (volts):  230
  • Electrode power cables:  12 AWG 
  • Power relays:  2-30 amp on board 
  • Ground connection:  screw
  • For home sizes up to 6,000 square feet (may vary with home construction, ceiling height and other factors)
  • Unit dimensions (inches):  23.75 H x 13 1/8 W x 8.25 D 
  • Weight (pounds):  22
  • Pallet size: 16
  • Replacement steam cylinder: 35-14 (GFI #7524)
  • Conductivity range (microSiemens): 400 to 1250 us/cm (test water for conductivity prior to selection) 
  • Water fill instant flow: 0.09 - 0.16 GPM (0.35 - 0.60 l/min) 
  • Input water type: potable water (no demineralized or softened water)
  • Drain connection: .75" to air break into 1.25" O.D. (32 mm)
  • Drain water temperature: < 140º F / < 60º C
  • Embedded fan flow: 71 CFM (120 m³/h)
  • Warranty (years):  5
  • Included:
    • Control:  GFX3 digital automatic humidistat
    • 90° drain fitting
    • Water supply brass ball valve
    • Water tubing supply kit
    • Water fill connection – ¼” OD compression to ¾” FPS


  • Self contained immersed electrode design
  • Integrated smart monitoring drain pump assembly
  • Multiple installation options:  Room mount – remote mount
  • Disposable steam generating cylinder
  • High water level and foam detection monitoring
  • Drain tempering
  • 20% adjustable capacity from rated max output
  • Integrated AHU fan relay for on demand humidification
  • LCD display with numerical and icon driven menu
  • Constant control monitoring and diagnostics
  • Pure sterile steam delivering premium indoor air quality

Your steam humidifier passes electric current between electrodes inside the unit's cylinder, heating the water within to create steam. The steam is then dispersed throughout your home for healthier, more comfortable air.

Breathe healthier with the GeneralAire® RS25 Whole House Elite Steam Humidifier working for you.

Video Support

  1. Using the AP-2 to test water conductivity (essential step that should be taken prior to selecting a steam model)
*To purchase this unit, contact a your local authorized GeneralAire® wholesaler. For your safety and the longevity of your unit, be sure all maintenance is performed by a licensed contractor.
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