What conditions will void the ZWB 42-3 warranty?

The warranty is voided if the boiler is installed with polybutylene pipe without an oxygen barrier, connected to radiant heating systems allowing oxygen penetration, used over its rated capacity, operated with insufficient water, used with unapproved antifreeze, or if failures result from improper operation, accident, abuse, freezing, or unauthorized alterations. The warranty also voids if water quality requirements are not followed or if repairs are made without proper authorization.