I had a pressure pump when I used to have a Bosch FL machine. Always had low water pressure error when using Bosch. Since I reside on the top floor and the storage tank is some 50 mtrs away there will always be this problem when the storage water tank is half empty and the water pressure becomes low. I did not face any problem after installing the pressure pump. After the Bosch WM life ended and I bought a LG FL WM the water pressure problem never occurred in the LG WM. I even use the indoor loft tank and LG WM works flawless even in low pressure.