In alt.solar.thermal Rod Speed wrote:

Thats on the low side of the recommendations,
60C, 140F is much more common.
http://www.google.com.au/search?q=Legionella+60+C


You get more hits for
http://www.google.com.au/search?q=Legionella+50+C

http://www.google.com/search?q=Legionella+50oC
gives a shorter list, and has some interesting links.


http://www.dhmh.state.md.us/html/legionella.htm
says you are just plain wrong using rigorous science.

I see adherence to the earlier advice.

"Legionella die rapidly at 55oC (131o F)(3 log reduction within 1 hour),
and are killed almost immediately at temperatures over 60oC (140oF)."

It was present in the tested systems because they were kept below 43c.

Didn't you say, "Water with chlorine added, ie city water supplies will be
ok. Well water needs special treatment.", earlier?

" As legionella is chlorine tolerant, it will survive many of the standard
municipal water treatment protocols. Once present in a hospital hot water
system, legionella is able to survive and multiply, particularly as hot
water temperatures are kept relatively low to minimize the scald risk for
patients [35]. In Maryland, state regulations for nursing homes limit
temperatures at the outlet to 110oF [43oC](COMAR 10.07.02); "

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Clarence A Dold - Hidden Valley (Lake County) CA USA 38.8,-122.5