The Grundfos Scala 2 is a fully integrated water booster pump deliivering perfect water pressure in all taps at all times even with multiple taps and showers running at the same time. It packs a pump, motor, tank, sensor, drive and non-return valve into one compact unit, Scala2 automatically adjusts performance to both inlet pressure and water consumption in the home. Scala2 has a sound level of 47db(A) in typical use and thereby offers one of the lowest noise levels of any booster on the market.