you don't really need drain hose for outside multisplit unit, my AC drain hoses from all indoor units are connected to my WC tank, I used previously pumps to pu

you don't really need drain hose for outside multisplit unit, my AC drain hoses from all indoor units are connected to my WC tank, I used previously pumps to push the water to the roof, but they were not reliable and once after thunderstorm they died when I finally went for passive solution, should have done it from the beginning)