that he didn't want my mom to use hot water when boiling water for
pasta or whatever. He claimed that it was "stale" and "nasty" from
sitting in the hot water heater for an extended period of time.
Now, if I'm in a hurry, I'll use hot water to facilitate getting
boiling water quicker when cooking. On the other hand, if I got time,
I'll start with cold tap water, supposedly in the belief that it is
somewhat cleaner. But after all these years, I still remember his
concerns, and now I'm wondering if they were unfounded.
Is there really any difference in how clean cold water straight from
the pipe is compared to water that may have set in the water heater
for an extended period of time? One could argue that the hot water
killed off bacteria that would otherwise have been present, but of
course that's a moot point when you consider it's going to be boiled
anyway. Besides, there probably aren't many bacteria that would be
killed in 120 to 130 degree water that wouldn't be present in ordinary
tap water anyway...
Just a random thought... I've always kind of wondered about this.
Anyone? Oh, and I'm assuming that the water heater in question is not
backed up with sediment. Of course that would be rather nasty...
I have never used the water from the hot tap for boiling a pot of
water for pasta, nor do I use it for consumption. Hot water is more
likely to have (salt) contaminants. Cold water is more likely to
contain dissolved gases, but boiling will remove the gas.
I don't often use hot water for cooking and caution other
people not too. However, a biological concern is not
particularly valid unless your incoming water isn't clean or
you don't use your hot water tank much.
However, the concern is valid. A major concern is that hot
water dissolves more things and to a greater extent than
cold water. If you have an older house that uses lead
solder, you will get more lead in the water if you use hot
water for cooking. But even if you have iron pipe or copper
pipe with lead free solder, stuff (who knows what) is
getting dissolved by the hot water as it passes through the
pipe. Sure it is minuscule. None of this means much with
just a few times, but if you consistently use hot water to
make drinks and to cook for 30 years, you will have received
a lot more contaminants and some of those will accumulate in
you compared to always using cold water. It simple to
avoid. Why step on a banana peel, when you can see it and
step over it?
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