You will need a cold water supply.
Models with water filter:
20 - 120 psi (138 - 827 kPa)
Where reverse osmosis water filtration system is connected to a cold water supply:
40 - 60 psi minimum to reverse osmosis system (2.8 kgf/cm2 - 4.2 kgf/cm2, or less than 2 - 3 seconds to fill a cup of 7 oz capacity)
If the water pressure from the reverse osmosis system is less than 20 psi or 138 kPa or 1.4 kgf/cm2 (takes more than 4 seconds to fill a cup of 7 oz or 198 cc capacity):
Check to see if the sediment filter in the reverse osmosis system is blocked. Replace the filter if necessary.
Allow the storage tank on the reverse osmosis system to refill after heavy usage.
If the water pressure remains low, call a licensed, qualified plumber.
All installations must be in accordance with local plumbing code requirements.