I have been burning 18" wood in the PH due to the pre-PH stove being smaller. Last spring I cut the 2013/14 wood at 20"+. I'm getting ready to cut for 2014/15 and wanted to be sure I was happy with the length, so I brought a load of the longer wood up to the house today and have been burning it. The longest piece was small, oddly cut end, and was 23.25" - it went in on a diagonal, and went in easily, which made me quite happy. I'm liking the 20+" length. Easy to load and easy to fit the over-length pieces, so I think that is what I will cut for 2014/15.