We all depend on plumbing and heating technicians for hot and cold fresh running water in our homes and offices and for staying warm in cold weather. Plumbing and heating technicians need to be able to plan and design systems, then install and test them. On occasion, they will also need to diagnose faults and make repairs. The plumbing and heating technician works both indoors and outdoors, in homes, and in commercial projects as a key part of the construction industry.