Would never do this on a regular basis, but thought why not. Was leaving for the festivities on New Years Eve and wasn't sure if we would make it back so I loaded the boiler to the hilt. Way out of the normal for me, especially since it was a balmy 56* out, but thought why not, if I get to drunk I won't have to worry about the house getting cold. ( No storage ) Ended gettin home about 2:30 and went straight to bed, didn't even look at the boiler. Cleaned ashes and reloaded this afternoon at 2:00. Doubt that I'll ever get that long of a burn again.......