Heat flows from the warm to the cold body because the energy state is higher.

         Heat flow moves energy from a higher temperature to a lower temperature. The bigger the difference in temperature between the two objects, the faster heat flows between them. When the temperature is the same there is no change in energy due to heat flow. Heat flows from a hot body to a cold body until thermal equilibrium is reached.

        Radiation and conduction are the two methods of heat transfer. Convection is a special type of conduction.