Yes. That is what I was told today from another plumber.
Bradford-White is denying any warranty entitlements if you install one of their heaters with a water softener in the structure.
If this is not true, and only affect a specific region, please make the adjustments on this thread.
I found this to be quite shocking today, and wondering if the other mfg's are going to start doing this.
This plumber told me that Bradford White denied a warranty replacement on a water heater 4 years old that had a water softener in the home.
Anything anyone has to add, please do.