What is the recommended water pressure for the washing machine?
The water supply pressure must be between 14.5 to 145 psi (1 - 10 bar) with a minimum of 2.2 U.S. gallons (8 liters) of flow per minute. A pressure regulator valve must be installed if the maximum water pressure is exceeded. (Page 15)
From the official Bosch WAT28400UC Front-Load Washing Machine manual, page 15
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