Any municipality may provide for, establish, equip and maintain a full-time paid fire department. A paid fire department shall be subject to the authority, control and discipline of the administrative authority. For the purposes of this article, the term "paid fire department" shall be taken to mean only a municipal fire department maintained and paid for out of public funds and whose employees are paid on a full-time basis out of public funds. The term shall not be taken to mean a department whose employees are paid nominal salaries or wages or are only paid for services actually rendered on an hourly basis.