Completing on what Lee answered.
the way i understand it they are robust and allow to be used more regularly. A domestic washing machine is meant to be used by one family. Here we are not going to have one washing machine per family, so they will be used more frequently. (The technician who repaired my domestic washing machine, told me to leave at least 2 hours between two washings to let the machine ‘cool’ down’).
They are bigger (so take up more space than the domestic ones), and like lee says: the drums are bigger.
From a sustainability point of view: I think recuperating our washing machines that we all own now, is more sustainable than getting new ones, maybe to be replaced by more professional ones , once they start braking down. (with the remark lie made: will people be open to put their laundry together with sb’s else’s laundry, or with the laundry from the commons).