Little to none. As the motor within a Syker System is only operating for roughly a quarter of the time, there is very little source of noise. We have designed a Syker System in such a way that the motor is not under any stress and is therefore very quiet. In most environments where a Syker System is installed, it will likely be the last thing you hear. When no water is being injected and the motor is not turning, the sound is zero; this is typically the case 75% of the time.