Immersion heater timer query

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65°C is considered minimum setting to stop legionnaires.
Legionella will not breed and multiply above 45C, but the gov. recommendation for hot water storage is 60C or more. Above 50C it is killed, but the higher the temperature the quicker it dies. Unfortunately higher water temperatures may also increase scalding risk.

see also http://www.hse.gov.uk/healthservices/legionella.htm
 

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