Water tank on the roof needs huge supports to support the weight. And then also not much pressure. The tank is to supply the pump. My parents place had this. It was a pain to maintain, but you get strong pressure especially when many taps are on at the same time. We have bypassed it about 10 years back and pressure is not too bad still. I believe that pub has upped the pressure on their mains over the years.Originally Posted by buttercarp