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Should I be looking to replace it?
Probably, if it looks sad.
Will it make any difference to the water pressure if I only replace the section inside the house?
No, I don't think so, the flow rate is limited by the weakest part of the pipe run.
Howard-
the flow rate is limited by the weakest part of the pipe run.
Which is what that is normally - the pipe is bigger on the other side of the outside stopcock.
You might think that standard 22mm domestic piping would be a barrier to increasing pressure but I can tell you from experience that if you improve the connection between the stopcock and the rest of the house your water
pressureflow will improve.
Fox
Right, I know it's been discussed before, sorry. The water supply that comes into my house is lead pipe, runs around 6/7m through the basement, held up on nails. It's visibly dented/sagging in places. The water pressure is ok in general, but top shower (electric) and the tap up there basically go to a dribble if someone is having a shower downstairs. Water meter is in the street directly outside the boundary wall, about 3m of front garden in between.
Should I be looking to replace it?
Will it make any difference to the water pressure if I only replace the section inside the house?