Some users were surprised by the noise, but even laboratory ultrasonic equipment DOES sound a bit, so get prepared to have it run in the garage or worskhop.I don't know what the temperatures settings are for, either they don't work or the ultrasonic process is enough to warm the water from 25 to 75 deg C in 30 minutes of operation! I believe more in the latter.Used for rough cleaning of submerged pump stages and wheels clogged with dried iron+manganese paste. The machine does a decent job but fine cleaning is still required.