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
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