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Posted 24th July 2006 at 6:10 PM Author Lara Oram Last Edited 24th July 2006 at 6:11 PM
According to some hot water system literature domestic hot water systems can harbour legionella if temperatures are too low to kill off the bacteria. For instance, "the bacteria can be introduced into the airstream by showers, taps, whirlpool baths, .." (Armstrong International, Inc., 2002, www.bbriefings.com/pdf/13/Hosp031_t_Armstron.pdf )
According to the same report, "while the bacteria will grow at temperatures of between 69ºF (20.5ºC) and 122ºF (50ºC), the optimal temperature range for the growth of legionella is between 95ºF (35ºC) and 115ºF (46ºC).
The legionella bacteria cannot survive in water above 131ºF (55ºC) for more than five or six hours and its survival in temperatures above 131ºF (55ºC) is shorter, depending on the temperature. Instantaneous destruction of the bacteria occurs at a temperature of 158ºF (70ºC) and above."
If this is accurate and not a sales pitch, what does this mean for liability and service provision???
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