This is my first post, so please bear with me, and thanks in advance for any help.
I have just moved house and i'm having problems in the new property.
the rising main feed to my cold water storage tank seems to have no real preassure, it seems to only refill at the same rate you would expect from a tap being turned on about a quarter of a turn. consequently when running a bath or taking a shower, the hot water and cold reduce to a trickle when the CWST becomes empty. I currently have to run as much hot as i can get out of the tank, then keep running up and down the stairs with pans of cold water from the downstairs taps to cool it enough to get into! I have timed the refill of the hot water cylinder and CWST and it takes about 40 mins to complete.
The rising main enters the loft with what i beleive is a 15mm pipe, it runs into a service valve and then is 'T'd off to the CWST and the CH Expansion tank, the flow rate is the same at both tanks so I know the flow rate/preassure problem is not to do with the ball valve oni the tank.
Is it possible for the service valve to be faulty, causing a lack of preassure? and if so is it easy to diagnose these faults? the rushing sound of water does seem to be loud around the valve.
If this is not the case can anyone please advise where my next point of diagnosis should start, water preassure and flow from the kitchen tap, although not outstanding is not a problem.
Thanks in advance