On Thu, 26 Jul 2007 23:21:21 -0000 someone who may be Mike Holmes
wrote this:-

DHW storage is not an issue with the Heat Bank idea. However, is it
really neccessary to distribute water at this temperature?

1) it is impossible to avoid legionella. The little nasties are in
the water as it falls from the sky.

2) what should be avoided is a high concentration of the little
nasties mixing with people particularly susceptible to them.

3) at low temperatures they are largely dormant. At high
temperatures they are killed off. Between those they breed nicely
and thus attain a high concentration.

4) people who are not particularly strong are the most susceptible.
That is why the well known outbreaks tend to involve hospitals, care
homes and the like.

5) in a domestic situation the precautions which are taken in larger
buildings are unlikely to be worthwhile.




--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54