Most tankless makers require water under ~7 gpg or proof of softening; Boerne owners skipping softeners face denied

https://pub-a3d0921cc64d4b5c8a08eea958469665.r2.dev/tankless-water-heater-repair/what-358-mgl-hard-water-does-to-boerne-tankless-heaters.html

Most tankless makers require water under ~7 gpg or proof of softening; Boerne owners skipping softeners face denied claims for exchanger leaks, LC faults, and scale damage despite regular maintenance logs.