I'm using a wood fired hot air furnace that is outside of my home. If it didn't go a min' of 8 hrs I would think there was something wrong with it. I couldn't imagine having to load one every three hours. Even in this frigid weather I can easily get 8 hrs overnight as long as I don't mind the house getting down to 69-70. It was 6 below zero here this morning, I filled the stove at 9:45 last night, at 5 am it was 73 in here. I'm heating a walk out ranch so about 1900 sf total, the basement is finished.
Stay warm my friends!
Stay warm my friends!