What does BPA-free materials mean in practice?
The scope depends on documentation and test method; the label alone does not describe temperature, migration or product ageing.
When does it matter?
BPA-free does not automatically mean absence of other bisphenols, safety of every additive or ability to remove BPA from water.
Which solutions are related to it?
Check the declaration of conformity, intended water contact, operating temperature, migration results and exact model identity.