Heater works like any other solar heater from other brands or racold models. The problem with alpha pro is it’s expensive but few thousands to avoid a pipe that goes higher above overhead tank. Racold claims it avoids heat loss blah, blah etc. But then there is an extra component: float valve that often gets jammed and tank doesn’t get refilled causing complete stoppage of water making even emergency electric geysers inside bathrooms useless.
Racold should stop selling this model.