Source google image: https://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Solar_heater_dsc00632.jpg/1200px-Solar_heater_dsc00632.jpg
Panneau solaire thermique definition
Source google image: https://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Solar_heater_dsc00632.jpg/1200px-Solar_heater_dsc00632.jpg