None of the above choices .It is a special personal warmer for office use .It is the heating system in an automobile .It is a payne heater .
what is the sort of " heater " that has defrost on it ?
This means that during the winter I must select either the floor / defrost mix , or the vent position , both of which work as intended . I ' ve managed to survive two upstate NY winters with the heater in this state of disrepair . It requires next to no maintenance , and what it requires does n't cost very much .