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How Much Pressure Can RO Deliver to My Ice-Maker?

The RO’s delivery pressure depends on how full the tank is. The pressure is high when tank is full and drops when tank depletes. See charts below for 4gal tank and 14gal tank.

4-gallon tank’s delivery pressure:

  • 3.0 gallon —> 50 psi output/delivery pressure (pressure inside tank)
  • 2.5 gallon —> 36psi
  • 2.0 gallon —> 24 psi
  • 1.5 gallon —> 18 psi
  • 1.0 gallon —> 14 psi
  • 0.5 gallon —> 10psi
  • Tank empty —> 5 psi (pre-charged pressure)

14-gallon tank’s delivery pressure:

  • 10 gallons —> 50 psi output pressure (pressure inside tank)
  • 9.0 gallon —> 40 psi
  • 7.8 gallon —> 30 psi
  • 6.1 gallon —> 20 psi
  • 3.3 gallon —> 14 psi
  • 1.6 gallon —> 10psi
  • Tank empty —> 7 psi (pre-charged pressure) 

Ice-Maker Inlet Pressure Requirement:

If your ice-maker requires a minimum input water pressure of 20-30psi, you need to have at least 50+psi input water pressure going into your non-pump RO system. If your water pressure is under 50psi, the tank will not fill up enough, and the delivery pressure to your ice-maker may be sluggish and unstable. To boost output pressure, you can add a Permeate Pump to your RO system.


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