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I have a 4 bed, 1 bathroom, 1 ensuite house and plan to have aVaillant ecoTech plus 937 storage combi fitted. Pressure is 2.5 - 3 bar (working pressure 1.5 bar - what is the difference?) and when measured at our kitchen cold tap we get 11 - 15 litres / min. if we measure flow at the 22mm...