A piezo printhead employs piezo material. When electric power is applied, the material deforms, generating pressure to eject ink onto the media.
A thermal printhead utilizes thermal energy. By heating the ink, it creates vapor bubbles, propelling the ink onto the media.
The key difference lies in the ink ejection mechanism. A piezo printhead propels ink by deforming piezo material through electrical power, while a thermal printhead propels ink by generating steam through ink heating.