Yikes!
Since I was quoting that figure of 55C from memory, I thought I'd better do some quick research on the net. This is what I found:
Quote:
Legionella Pneumophilia, the bacteria that causes Legionnaires’ disease, thrives in warm, stagnant water.
A water temperature of 120°F does not kill the bacteria; a minimum temperature of 140°F is required.
A water heater set at 120°F can contain water as low as 100°F.
To eliminate the bacteria, several steps need to be taken, including eliminating dead-legs and system flushing. But, without a storage temperature of 140°F, all other steps cannot solve the problem.
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Source:
http://www.cashacme.com/watertemp.html
Quote:
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Some facilities distribute hot water at temperatures as low as 120°F, and some even lower (e.g., 110°F), to eliminate any risk of scalding. Unfortunately, Legionella will grow in temperatures as high as 122°F, with an ideal growth range of 95 to 115°F .
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Source:
http://www.nursinghomesmagazine.com/...es.htm?ID=3411
Looks like this may not be the best way to save a few dollars.
John.