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Thanks to everyone for your advice. How does the accumulator work and can anyone recommend which is the best type to purchase ? Regards Gary

I recently fitted a combi-boiler. Everything is fine when i only put one hot tap on anywhere (12-13 litre/min) in the house, but if i put a hot tap on upstairs and then open a cold or hot tap downstairs i lose my water flow upstairs. So i changed my mains water stop cock from 15mm to 22mm and...