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Think you might be right - no kitchen taps to test yet (no kitchen as such!) but tap in garden fed from mains and flow on that should be better. Water company have suggested upgrading ancient pipes outside to 25 or 32mm but can't guarantee it'll fix problem. At same time they say there is a...

just had Vaillant 824 combi fitted replacing old Potterton floor standing boiler. Water pressure on old sytem was good - could run taps/shower together no problem. Now opposite - low pressure and reduces to trickle if using hot/cold simultaneously. Shower pressure also low. any suggestions?