This would only be possible if heat flowed into/out of the system.

Heat flowed through her, but she made no effort to identify its source.

Heat is flowing from your warm hand to the metal.

Heat flowed from her face to his, warming him throughout.

Heat flows constantly from its sources within the Earth to the surface.

But that does not determine whether heat flows from one object to another.

The heat flowed and pulsed from one part of his body to another.

A conductor is a material which electricity, heat or sound can flow through.

In conduction, heat flows within and through the body itself.

Then he partly opened the door and tremendous heat flowed from the room into the cold hall.