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Heating with hot water for potable use !!!!!!
I am currently working at a site where they are using the hot water to heat with.This is a large high end condo.there are air handlers and diverting valves in each unit.The common water is supplied at 180* with a mixing valve to temper the water for potable use.My concerns are when you are not using the heat the water sits stagnant in heating coil in air handler until you turn it on again,then that whatever temp stagnant water is mixed in with the rest ,so are they brewing legionnaire's in these coils ? i called the state and was told if its existing and i service it i accept no liability , being a licenced plumber i am still concerned what do you think ?