Indoor plumbing dates back to at least 2500 B.C.
At 140 degrees, it takes five seconds for water to burn skin. At 160 degrees, it takes only half of a second. Your water heater should be set to no hotter than 120 degrees.
Approximately 1 in every 318 homes or buildings has a leak.
A leak the size of a pinhead can waste 360,000 gallons per year, enough to fill 12,000 bathtubs to the overflow mark.
via http://www.thorntonandgrooms.com/library/article/interesting_plumbing_facts/
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