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Question
#97899. star_gazer
asks:
When boiling water it is much better to boil cold tap water than hot tap water. Why?
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BRY2K 
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Regardless of the common household urban myth cold water does not boil any faster than hot water.
Occasionally, common sense does prevail. If you think about it, cold water has to BECOME hot water before it becomes boiling water. The thing is, for sink water to become hot water, it has to pass through the water heater, which is less sanitary than your regular plumbing, and if your house is old enough to have lead pipes, running hot water through them will actually extract more poisonous lead than cold. You could always run hot tap water through a Britta filter but... why would you?
More tips here:
 http://www.ehow.com/how_2223522_boil-water-faster.html
Jul 24 08, 3:36 PM
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zbeckabee 
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Here's a little more info:
Is it okay to use water from the hot water tap for drinking, cooking, or making baby formula?
Hot water generally comes from a hot water heater that may contain impurities that should not be ingested. Some of these impurities might be metals from household plumbing that are concentrated in the heating process. Additionally, these impurities from the household plumbing dissolve more rapidly in hot water than cold water causing the amount of impurities to be higher in hot water.
http://www.fcwa.org/water/faq.htm
Jul 24 08, 4:07 PM
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