A plumber installs, maintains, and repairs pipes, fittings, and water supply, sanitation, and heating systems in both residential and commercial settings. There are different types of plumbers such as commercial, service/repair, residential, sanitary, and water supply plumbers who work in various areas. Plumbers are responsible for locating and repairing leaks, changing out plumbing parts, choosing the correct tools, preparing cost estimates, and utilizing technical, physical, and problem-solving skills to effectively do their job.