Hot Water tank filling too slowly

[Ben-gee]

the valve to the loft water tank is fully open, maybe there is a valve at the tank (?) I'll check. Thx for the suggestion

More likely the diaphragm in the ball valve , replace this if stiff or if black stuff gets on your hands when you touch it as this means the rubber is breaking down.

 

[HebrideanIsland]

More likely the diaphragm in the ball valve , replace this if stiff or if black stuff gets on your hands when you touch it as this means the rubber is breaking down.

I'll check the diaphragm too !