According to Nehmo Sergheyev :

And Awm, how does (according to the "Bye Laws") something like the
autocirc system promote or create an environment for Legionnaires
Disease?

The issue is that Legionaires disease will culture and grow in
warm water (around 100F to 120-125F). By recirculating the water, you'll
have pockets that stay that temp. If you have water set to 140F
(US CDC, OSHA and Canadian MoH recommendations, but this is in violation of
some US state legislations particularly for "institutions" that have
a limit of 120F) and can keep it that way, then there's probably not a problem.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.