tank takes 5 minutes to fill with water?

Is the cistern is actually fed from the mains in the first place, or is it fed from the cold tank in the loft?

If there is a stopcock or service valve, is this fully open?

With standard ball valves, there is often a choice of two nozzles; a big one fo rlow pressure supplies like a loft tank and a narrow one for high pressure mains feeds.

acp
June 2017