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hi,i have just moved into a new house which has a sime 80c format combi boiler (gas),the hot water flow throught the house is pretty poor, i dont have the manual for the boiler so i dont know what its DHW flow rate should be,i have a mains supply of around 12 litres a minute(cold water) and the hot is flowing at 3 and a half litres a minute,i have fitted a mixer shower and its like getting spat on by a pigeon(yes i said SPAT not a misprint)so the question(eventually) is......is there a way of adjusting the hot water flow rate to give more pressure? if so how........or if not would fitting a shower pump to the shower help out any?? thanks for any help on this matter and a happy and prosperous new year to you all...........thestellaman