Arkansas requires that a person obtain a solar and hydronic heating mechanicâ€™s license in order to perform work on solar domestic hot water heating systems. The Arkansas Department of Health offers journeyman and master mechanics licenses which, like other mechanical licenses in the state, require an application demonstrating experience and an examination. Four years of experience are required to test for the journeymanâ€™s license and five years to test for the master mechanic licenses. Licenses are renewed annually with a fee of $200. Very few solar mechanic licenses have been issued since the rules were put into place in 1984 as part of Arkansasâ€™s plumbing code.