What voids the Rheem warranty?

What voids the Rheem warranty for HVAC and water heaters includes several conditions that cause warranty denial if not followed, as stated in Rheem warranty certificate. For Rheem HVAC like RA14 AC, RP16 heat pump, and R96V furnace, warranty is voided if unit not registered online within 60 days of installation, then warranty defaults from 10-year to 5-year parts, so registration is critical. Warranty voided if installed by unlicensed contractor or DIY without licensed professional, as Rheem requires professional installation with proof of installation. Warranty voided if unit modified, repaired with non-Rheem approved parts, or used for non-residential commercial use without commercial warranty. Warranty voided if damage due to improper installation such as incorrect refrigerant charge, undersized ductwork causing high static pressure, improper gas pressure, or failure to provide proper electrical voltage. Warranty voided if damage due to lack of maintenance such as not changing filter every 2 to 3 months causing high limit failure, not cleaning coil causing high head pressure, or not descaling tankless water heater in hard water causing scale damage. For water heaters, warranty voided if used with hard water over 7 grains without softener, if pressure relief valve tampered, or if anode rod not inspected. Warranty voided if unit operated in corrosive environment or with contaminated air containing chlorine. Always keep proof of purchase and maintenance records.