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Can anyone suggest a practical way of directly measuring the flow rate in a central heating system. My recently installed (Corgi installer) Worcester Greenstar 24Ri never heats the flow water to more than about 50degC., even though the temp. at the top of the aluminium casing on the heat cell...

I had a new Worcester 24Ri fitted to an existing system a few months ago and now the flow temperature never gets above about 50deg.C. ( (measured with pipe thermometer) The Worcester service guy has visited 3 times , replacing the heat cell and the control circuit board. Each time the...