Copper piping began to replace lead piping for plumbing purposes in the 1930s and 40s as the dangers of lead to human health were in the early stages of understanding. Plumbing, the word itself, comes from the Latin term plumbum, which means lead, and were once made from lead as well. Galvanized iron piping was commonplace, for potable water use, in the United States from the late 1800s until around 1960. In a typical home, over 9,000 gallons of water are wasted while running the faucet waiting for hot water. Hot water heat recycling is the process of recovering heat…