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Thanks for the replies and I apologise for the delay in my response. I have inserted two more images; one shows a schematic of the boiler measurement positions, and the other shows the return temp (before the bypass valve) with the "mixed" return temperature (after the by pass valve). This...

i have a worcester bosch junior 24i combi boiler fitted with a honeywell DU145 automatic by-pass valve. What i wish to know is when is the boiler operating most efficiently? I believe that this occurs when the differential central heating water is above 20degC, ie the difference between the feed...