Why would I choose a 5.0 bar over a 3.0 bar TankBoost?

Compared to the 3.0 bar model, the 5.0 bar model can be better suited for boosting water in taller or larger buildings, across multiple floors and via longer pipe runs. This is because the 5.0 bar variant includes a 5.0 bar pump (at closed head) giving the system a higher starting point to work from. In addition, the 5.0 bar TankBoost pump provides up to 120 L/min giving more flow than a 3.0 bar TankBoost which provides up to 80 L/min.