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Thanks Masona, The boiler is a combi, is the pump speed automated or manual? :?:

The system is a Worcester Bosch 28siII with 7 radiators, 6 fitted with Thermostatic Radiator Valves. The problem we have is that the boiler is noisy and you can hear the water being pumped through the radiators (annoying 'wushing sound'). If you turn the TVR's down/up a notch then you get an...