The invention relates to an appliance including an infusion chamber having an opening for receiving a fill, a closure part for said chamber, a water container connected to the chamber, pressurizing means for delivering air into the container, and control means suitable for causing a certain volume of water to be delivered from said container into said chamber, said pressurizing means being connected to a compression chamber that is arranged between said pressurizing means and said container and that includes inlet and outlet isolation means. According to the invention, with the water container full and the outlet isolation means including the control means, the control means is suitable for causing the compressed air to expand suddenly in the container and to flow with a curve of decreasing pressure. The invention is applicable to appliances for household use.