Systems and apparatus for heating or cooling food. A heating and cooling system for operative connection to a well includes a first manifold having a plurality of openings, each allowing a seal to be made against a first surface of a Peltier chip, and defines a flow path for a heat transfer fluid which directly contacts the first surfaces of a plurality of Peltier chips. The fluid circulates through tubing from the manifold to the well and connects to a flow space of a tray disposed therein. A second opposite manifold may be joined to the first manifold to form a block and defines a second flow path allowing direct contact with the second surfaces of the plurality of Peltier chips. The fluid circulates through tubing from the second manifold to a radiator. The manifolds may be joined to form a manifold block. The trays may be interchangeable.