What water pressure is required for the WDU28?
The water inlet must have a minimum water pressure of at least 100 kPa (1 bar) and must not exceed 1000 kPa (10 bar). When the tap is open, the water flow must be at least 8 l/min. If the water pressure is higher than the maximum, a pressure-reducing valve must be installed. (Page 17)
From the official Bosch WDU28 Washer Dryer manual, page 17
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