What is the difference between heat and enthalphy?
Heat is defined as the energy that flow into or out of a system because of difference in temperature between the system and its surrounding. Give special attention to the word 'flow'. It is not the energy that is stored in the body in the form of temperature. It is the energy that is transferred due to temperature difference.
Now, Enthalpy is the energy stored in the body at constant pressure. And here the energy is stored.