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I think pressure is ok. Getting 14litres min on the jug test. HW is all 15mm and existing non electric shower is perfect. I’ll go with 15mm then thanks

Hi All, Have 40s mid terrace supplied by lead pipe. About to add plumbing for a new loft bathroom with toilet basin and electric shower. Hw is supplied by greenstar 30i down stairs in kitchen. Should the new feeds be run in 22mm to maintain pressure up there or will 15mm suffice I assume...