Tenn Dave
Minister of Fire
Wow, I don't think my PH could ever do 30 hours. For that matter 24 hours would be a challenge.I know they have a 6 month buy back guarantee if you are unsatisfied and I know that are great about sending replacement parts if there are issues for their newer stoves.
I installed the IS in August. During shoulder season I was burning some punky ash and was loading every 24 hours with plenty of coals. I pushed that to ~30 hours a few times with plenty of coals to start the next load.