there is a new wc in town. Sorento SRTWC8122. Tankless design, direct flush system. Traditional WC, water stored in cistern (tank) 6L and some brands 4.5L. SO, the flushing power is only limited to the water stored in tank, there is no way to improve flushing power. With SORENTO direct flush system, flushing strength relies on incoming water pressure, so the stronger the water pressure, the better the flush. Recommended to have 2bar and above.

Here is a demo

nop only S