Washing plant to perform a washing cycle of objects providing at least a pre-wash operation and a washing and heat disinfecting the objects operation. The plant includes a first battery of pre-wash units, in series one after the other along a first alignment axis and a second battery of washer and heat disinfection machines along a second alignment axis, different from the first alignment axis to operate parallel with each other and perform object washing and heat disinfecting. The second battery is able to receive, along a feed direction transverse to the second alignment axis, the objects subjected to pre-wash exiting from the first battery along the first axis alignment. The second battery feed direction is also transverse to the first alignment axis. Movement members are provided to divert the objects exiting from the first battery and direct them, aligned with the direction of feed, towards the second battery.