passatdoc
Well-known member
To the best of my knowledge, whole-house softener systems in the USA are plumbed to the hot water line, to avoid addition of sodium to one's drinking water. This assumes of course that you use the cold water tap to obtain your drinking water. I suppose someone might try to make hot chocolate using hot water from the hot water line, which might lead to extra salt being ingested. But someone preparing coffee or tea in a coffee maker or with hot water from an electric kettle would/should start with cold water.