Just for the record: a couple of days later, a local newspaper had this story; their short piece said the box would boil 10 liters in 2 hours. That's about dou

Just for the record: a couple of days later, a local newspaper had this story; their short piece said the box would boil 10 liters in 2 hours. That's about double my optimistic estimate, which did not take into account any losses by conduction or convection. From the pics, the box doesn't seem to be as big as 1 meter square either.