Bought this heater for a spare bedroom to be used by my grand daughter when she visits.  Since the room is the the farthest from the heating system in my old Tudor home it can tend to be the chilliest on cold nights.  So, when she came last, I turned this on about a half hour or so before she arrived and she walked into a nice cozy, warm room.  She kept it on throughout the night on a low setting and said in the morning that it was a wonderful toasty night's sleep.