The present invention relates to an infusion machine comprising a boiler having first heating means provided for heating a liquid suitable for infusion preparation, in particular for espresso coffee preparation, at least one supplying group (14), and infusion means (43, 43b) provided for infusion preparation and associated with second heating means (46). The supplying group (14) in the machine further comprises an accumulation chamber (41) hydraulically connected to the infusion means (43, 43b) and arranged to contain a certain amount of liquid. Second heating means (46) are provided, which are arranged to directly heat the liquid contained in the accumulation chamber (41) for hydraulically feeding the infusion means (43). The invention also relates to the supplying group and the method of manufacturing the machine
