The piping system in a hot water or steam hydronic heating system delivers the heated element to the final convector used to exchange the heat. Pipes are usually made of steel, iron or copper. A proper design and installation of the piping system is crucial for the efficient and proper operation of your new homes heating system. Many older piping systems can be corroded or difficult to alter. They can also have asbestos, a commonly known health hazard, insulation. Most heat piping defects go undetected until a trained professional inspects the system.