Abstract: An apparatus for heating containers, comprising a carousel structure, which turns about a vertical axis and carries a plurality of microwave heating units, wherein each microwave heating unit comprises a heating chamber designed to receive a respective container and a microwave generator connected to a waveguide, which communicates with the respective heating chamber, wherein each of said heating chambers has a base on which a respective container is to rest, a rear wall, which extends upwards from said base, and a lid, which is mobile between an open position for insertion and removal of the containers and a closed position for microwave heating of the containers, and wherein said waveguide has an output section open on said rear wall, an input station, designed for loading the containers to be heated into respective heating chambers, and an output station, designed for removing the containers heated by said heating chambers.