I was always told that boiling cold water in a pot is better for you then boiling warm or hot water (from the sink).
Is there any truth to this statement?
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Yes, but not for any reason related to nutrition or ease-of-boiling. Older home plumbing systems may use lead solder, and lead is a neurotoxin which is particularly harmful to children. Hot water dissolves lead more readily and stays in your home's plumbing system far longer, so it may end up with much more dissolved lead than cold water. The EPA states:
I had heard that cold water from the tap contains less minerals and other contaminants. The only source I found refers to lead contamination, which should be quite rare. http://www.cpsc.gov/CPSCPUB/PUBS/5056.html
Warm tap water might contain small amounts of lead from old pipes and should be avoided according to the following sources:
fitsugar.com: Healthy Cooking Tip: Start With Cold Water
This article quotes the following recommendations by EPA (the US Environmental Protection Agency): Actions You Can Take To Reduce Lead In Drinking Water
This was also published by the New York Times The Claim: Never Drink Hot Water From the Tap:
Note that this is USA specific. Other countries might have banned lead soldered pipes much earlier or replaced such already.
See also this related question on Cooking.SE: Is hot tap water safe for cooking?.