Can you explain to me how that process works? Are you not boiling anything? As far as i knew even hopped extracts needed to be boiled. Maybe its something specific to Greece.
Hopped extracts already have the hops boiled to provide the bittering. The only real reason to boil is to provide pasteurization and one doesn't have to boil to provide that. Often boiling is suggested because in the past people lacked decent thermometers and they could still tell if their liquid was hot enough because they could see the boil. Bringing liquid to 160 for 10 seconds pasteurizes. How good is your thermometer?