The Board, by rule and after public hearing, may set reasonable license or examination fee for all licenses called for under Act 200 of 1951 as amended including, but not limited to Master Plumber Licenses, Journeyman Plumber License, Apprentice Plumber License registration. It may, among other things, issue restricted licenses and provided that the Board has adopted rules defining restrictions in the type of work allowed, geographical area served, and term of that type of restricted license. Restricted Plumber Licenses are limited to gas fitter, and governmental maintenance, service line installation, solar mechanic and hospital maintenance licenses provided that the licensee has demonstrated competency for the particular phase of plumbing for which the person is licensed including plumbing and / or gas inspector certification.