Have just shifted into our new 2 storey home with 3 bathrooms and find if we are showering and someone flushes the toilet or turns on another tap, let alone another shower, the water pressure and in particular the hot water just dies. I would have thought in a new home the pipes would cope with this. Would it be that the plumber has skimped on the amount of pipes or because the solar hws doesnt keep up? Any input appreciated