Not been on in here for a while but need some advise. Fitted a new bathroom and ensuit, the ensuit having a shower with a pump that seems to be using all the water in the header tank quicker than it can refill. I am thinking of replacing the header with a larger tank to try and resolve this? Will this work for one and whats the best way to join multiple tanks as I know I wont get a single large tank through the hatch. My plan was to leave the existing one and attach a second one of a similar size? All advise welcome.