A heat exchange apparatus includes an outer shell defining a cavity and a volume-occupying member received within the cavity. The outer shell and the volume-occupying member cooperate to define a fluid-receiving volume therebetween. An opening in the outer shell defines a passageway for receiving a liquid to be heated therethrough. The opening includes a fastener for removably attaching to an open top of a container containing a liquid to be heated, wherein the liquid to be heated will flow from the container into the fluid-receiving volume when the apparatus is inverted and the liquid will flow back into the container when the bottle is returned to the upright position.