By H.W. (Bill) Hoffman, P.E.
Plumbing and mechanical systems have two things in common: They use both energy and water. It just depends where you start to look at this picture. The federal government and many universities have put considerable effort to quantify the relationship between water needed to produce energy and energy needed to pump, treat and distribute water, and then collect and treat the wastewater.
They coined the term energy-water nexus. Yet there is another en