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Re: Looking for Hot Water Heater Efficiency comparison - Page 2

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Posted by Solar Flaire on April 9, 2007, 3:14 pm
..and 0% of gas water heaters. They heat from the bottom and do not
have the "pocket" of stratified water that stays cooler and
accumulates the bacteria.

Good study. A real eye opener.

Posted by nicksanspam on April 9, 2007, 3:54 pm

I knew you'd say that :-) How many of those people had the disease?

So, what can we do about that? What do these bacteria eat? Why would they
prosper in clean water? Should we filter it? I've read mineral sediments
lower the water temp in the lower part of the tank and make it more stagnant,
so Legionella tend to thrive and concentrate over time. Perhaps we should
drain heaters more often to remove sediment. Or run the lower element at
a high temp for an hour at night, once a week? Or use ozone or chlorine
or UV, or pasteurize water, with a counterflow heat exchanger?

If you think Legionella is bad, look into cryptosporidium. It's fairly
common, but most people have been exposed and have antibodies against it,
so infections only cause sommething like mild indigestion, for the most
part, with large exceptions, eg in Milwaukee (1993) and New York state
(2005.) Its oospores can survive and remain infective for hours in full-
strength household bleach. Anthrax spores and mad cow disease prions
are tougher than that. And what about giant comets?

Chacun a ses risques. We're all gonna die somehow.


Posted by Paul M. Eldridge on April 9, 2007, 4:33 pm
 On 9 Apr 2007 11:54:59 -0400, nicksanspam@ece.villanova.edu wrote:

Oh oh!  I didn't know you could read my mind.  [must... think..
only... happy... thoughts...]  :>)

I view this much like wearing a seat belt when I drive or not drinking
before I take the wheel -- it improves my odds of getting home safely,
or at least surviving a potentially fatal crash.  Sure, death is
unavoidable, but I don't plan to leave this world before my time (and
hopefully not because of my own stupidity).

For most healthy folks, Legionella isn't likely to be a major health
risk, but for those less fortunate, it could be an altogether
different matter; even those of us who enjoy good health will get
seriously ill from time to time and some of us will go on to battle
chronic illness, undergo chemotherapy treatments, etc.).  Why put
yourself or your family at needless risk, when any cost savings might
be measured in pennies a day?


Posted by nicksanspam on April 9, 2007, 6:10 pm

Not good. What can we do about this? Got solutions, vs problems?


Posted by Paul M. Eldridge on April 9, 2007, 6:25 pm
 On 9 Apr 2007 14:10:33 -0400, nicksanspam@ece.villanova.edu wrote:

Hi Nick,

If you're asking if I've developed a cure for cancer or HIV/AIDS, no,
sorry, not yet, but check back with me tomorrow and I'll give you
another update.  :-)


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