One other advantage of doing a fifth test boil, besides checking to see how the roof might drip and testing the fifth pan for boiling, is I am still thinking about doing two batches during one boil. The downside is ash rising into the other pans.

I designed my evaporator so I can easily lift the pans, I want to see how that works in practice and if I have ash rising into the pans. I will have steam pan lids that I can place on three of the pans to help prevent that as well.

I might find with a lesser boil time because of the RO, that I might not have to go for two batches.