A device for heating a liquid food with steam, having a liquid-transporting and a steam-transporting pipe (5, 7), where in order to effect the connection of both pipes for the purpose of heating the liquid directly in the pipe in a constructively simple manner, a coupling device (4) for connecting the pipes (5, 7) is provided, which contains at least one perforating needle (11), which is connected to one of the pipes (7, 5) and can pierce a perforable wall section (5a) on the other pipe (5, 7).