I have two 700L water tanks on the ground floor, and a pump that pumps the water from the ground floor tanks to a single 1,500L tank on the roof.
Municiple water refills the ground floor tanks, and a float switch in the roof tank turns the ground floor pump off and on.
It turns out the municipal water was off the other day, and we ran out of water last night. Both the ground floor tanks, and the roof tank were empty.
The brass valves got stuck closed. They were easy enough to fix, but they were a PITA to remove and replace.
I am wondering if the plastic type would be more reliable. The plastic type would also increase the tank capacity by about 10%