Anonymous4 years ago000Does the unit have to run with a hygrostat or can you also set it to just keep running? I can't sleep if the unit keeps switching on and off.Show in original language (German)Philips AG4 years ago-202Hello Anonymous, Thank you for sharing your question about our humidifier with us here. The HU4811/10 is very easy to use. It has only two settings and runs until the water tank is empty. Feel free to contact us via social media if we can advise you individually on the device. We are available for you on Facebook (http://to.philips/6182GCna0) and Twitter (http://to.philips/6183GCnaF). Best regards Your Philips Care TeamShow in original language (German)Commentursula-witzel4 years ago-404Unfortunately, I do not know. The device was returned.Show in original language (German)Comment