<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi, all--<div><br></div><div>Nick, please note that in the Quebec City study, none of the gas water heaters had Legionella while 33% of the electric heaters did.</div><div><br></div><div>See also: </div><div><br></div><div>Lee, T.C.,
J.E. Stout,
V.L. Yu.
"Factors
Predisposing
to
Legionella pneumophila
Colonization
in
Residential
Water
Systems."
Archives of
Environmental
Health 43
(1988);59-62 (available on <a href="http://PubMed.gov">PubMed.gov</a>).</div><div><br></div><div>Lavoie, M., Levesque, B. and Sergerie, D. "Prevention of Scalding and Legionellosis Associated with Hot Tap Water in Private Homes"(<a href="http://www.inspq.qc.ca/pdf/.../197_PrevScaldingAnd">www.inspq.qc.ca/pdf/.../197_PrevScaldingAnd</a>Legionellosis.pdf).</div><div><br></div><div>Best,</div><div><br></div><div>Mike O'Brien</div><div><br></div><div>
<br><div><div>On Dec 30, 2011, at 6:31 PM, Nick Pyner wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta content="MSHTML 6.00.6000.17107" name="GENERATOR">
<div>
<div><span class="687152101-31122011"><font face="Arial" color="#0000ff" size="2">I
think everybody boiled the whites once, not just the Germans. My mother did,
I lit the fire under the copper, and Whakatane is a long way from
Wiesbaden. Modern detergents make it usually unnecessary, and I could never
advocate anything other than the usual cold water in the domestic
arena, but it is still sometines done in hospital laundries. Those are
serious machines that can dump water at 90C. ( Heat exchanger
heaven)</font></span></div><font face="Arial" color="#0000ff" size="2"></font><font face="Arial" color="#0000ff" size="2"></font><font face="Arial" color="#0000ff" size="2"></font><font face="Arial" color="#0000ff" size="2"></font><font face="Arial" color="#0000ff" size="2"></font>
<div><br><span class="687152101-31122011"><font face="Arial" color="#0000ff" size="2">Down here in GodsOwn we don't have a choice - 60 for stored water 50 for
instant. Solar-heated water is usually a lot more than 60 anyway. Electric
storage heaters are banned from new construction. Gas storage is
virtually non-existant these days, and probably unavailable.</font></span></div>
<div><span class="687152101-31122011"><font face="Arial" color="#0000ff" size="2"></font></span> </div>
<div><span class="687152101-31122011"><font face="Arial" color="#0000ff" size="2">I was
far from impressed with O'Brien's comments. That on gas heaters being kosher at
49C because they heat the water from the bottom just seems absurd. While your
bath water goes down the plughole the wrong way, I'm sure your convection
currents are very similar to ours. Sediment collects in any storage tank and the
same can be said for stratification of the temperature of the water,
irrespective of the fuel that heats it. No comment on the hydronic pipes, but
elemination of stagnant cool spots in the tank should be an interesting
exercise.</font></span></div><p><font size="2">Nick Pyner<br><br>Dee Why NSW </font></p>
<blockquote>
<div class="OutlookMessageHeader" dir="ltr" align="left"><font face="Tahoma" size="2">-----Original Message-----<br><b>From:</b>
<a href="mailto:greenbuilding-bounces@lists.bioenergylists.org">greenbuilding-bounces@lists.bioenergylists.org</a>
[mailto:greenbuilding-bounces@lists.bioenergylists.org]<b>On Behalf Of
</b>Reuben Deumling<br></font></div>Nice, Nick. <br><br>I thought that Michael
O'Brien's summary of the issue was pretty succinct. <br>I didn't mean to imply
that there was <i>nothing </i>to Legionnaire's disease, just that an
unqualified across-the-board 60C requirement for water heater set points or
100C for washing white clothes is ill-considered, wasteful,
ideological.<br><br>It isn't as if climate change wasn't also expected to
expand the range of well known diseases. Overheating our DHW is not an
innocent requirement in the larger scheme of things.<br><br>(Bill's
cousin)<br></blockquote></div>
_______________________________________________<br>Greenbuilding mailing list<br>to Send a Message to the list, use the email address<br><a href="mailto:Greenbuilding@bioenergylists.org">Greenbuilding@bioenergylists.org</a><br><br>to UNSUBSCRIBE or Change your List Settings use the web page<br>http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org</blockquote></div><br></div></body></html>