Hi all, spotted this video on avoiding legionella in domestic heating. Seems pretty comprehensive and is not quite what you think (hint, the risk is generally very low for most people in most situations). However, he covers all of the variables so you can make your own decisions.
(26) What Temperature Should Hot Water Be? | LEGIONELLA Explained - YouTube
Could I also add that I hope when people are interfacing with (sometimes complex) semi industrial/ commercial built equipment that they are also using industrial quality transducers for measurement, and not a ds18b temp sensor that costs a buck off ebay 
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