The Central HPWH system shall be capable of supplying hot water at design outlet water temperature under specified operating ranges for:
a) Minimum and maximum ambient air temperature;
b) Minimum and maximum cold-water temperature;
c) Minimum and maximum building demand at design draw and recovery conditions and duration; and
d) Recirculation loop heat loss.
Design documentation shall specify the operating conditions at which the primary heat pump water heater can supply hot water at design outlet water temperature without engaging auxiliary heating mechanism.