my hot water flow to the bathroom is low not like the cold water , i have a ferolli 102 combi boiler which is 14ltr per min water flow how can i increase the flow
You can't. If you could increase the flow the temperature would drop. The combi boiler can only deliver so much heat (28 kW) - within that limiting factor you can choose to have faster flow at lower temp or slower flow at higher temp.
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