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If a building uses a hot water or steam heating system, while it is connected to the fresh water supply, it is basically a closed system. It is also installed and maintained by plumbers.
If a building uses a hot water or steam heating system, while it is connected to the fresh water supply, it is basically a closed system. It is also installed and maintained by plumbers.
== External links ==
*[https://www.aceplumbing.com/plumbing-faq/a-short-history-of-indoor-plumbing/ A Short History of Indoor Plumbing]
== Notes ==
== Notes ==
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