We set our fan speed at medium and the water level at medium and it goes through the water reserves in about 15 hours. So, there's a lot of output! We have a lofted house and have the humidifier on the 2nd floor and the whole house is shock-free and static free. We used to use a small humidifier on the main floor, but we've since gotten rid of it now that we have this machine. WOULD RECOMMEND to anyone.