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I have been reading all these posts about open systems being breeding grounds for the bacteria causing legionnaires disease. I have a second home in the mountains in a cold area. We are usually there every weekend but sometimes every other weekend. The boiler is on all the time and hot water is made by an indirect fired hot water tank. I have the water temp on the indirect set at 122 degrees now. Since the water can sit in the indirect for a week without being used what temp should I have the hot water set at to prevent the legionnaire bacteria from multiplying. This hot water is for household use; it is completely separate from the water in the heating system. Thanks.