i have a combi boiler in utility and have an electric shower in ground floor
extension fed off 15mm cold water to hand basin tap. there is no
pressure from shower. i did read elsewhere that showers should be
plumped directly into 22 mm but since on this forum noticed that
15mm cold suplly is usual to feed combi system.what can i do
to improve shower as refitting this room.i have considered running
pipe from outside mains into shower room directly- as cannot
trace combi biler pipework to etension. please advise best way forward
many thnks norma