You can also pencilmod a S1 for better efficiency, about 100GHS at 100w. It doesn't get you too much but it's a nice and silent miner that is fun to use. Some guides say you need a multimeter for the pencilmod but you can erase if you mess up so you don't need one.
If he's paying even a tiny bit for electricity, he shouldn't try anything with a S1, assuming OP doesn't want to mine at a loss.
They are long outdated miners and can only be run by people who have their electricity paid by someone else.