A mathematical model has been developed to evaluate the thermal behavior of a heated port for the feed of free-radical initiator solutions to chemical reactors. Initiators are employed in the commercial preparation of certain polymers via chain reactions, and heat prevents undesirable polymerizations on the surfaces of these addition ports. It is shown that the various materials assessed in this study follow a pattern of thermal performance in steady-state and transient operations based on their physical properties. Additional metals and alloys can be readily examined with the proposed analysis without solving the full energy balances. It is demonstrated that the most favorable materials for this application are those with higher thermal conductivity. They afford lower energy consumption as well as more frequent and longer charges of initiator without dropping below a desired minimum.