I have a 3-year-old Linea 26 boiler, and the hot water flow rate is very low. Sometimes the water runs hot then cold, and you can hear the burner turning on and off.
I measured the flow rate with a bucket - 4.4 litres / minute from the kitchen hot water tap, 17 l/min from the cold tap. When the boiler was installed, the engineer recorded 11 l/min from the hot tap.
Even with the boiler switched off, I still get the same flow rates.
Is there something blocking the water flow? Any other thoughts?