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Thanks. I've concluded that to just assume a number halfway between the output of a P+ and a K2 will be close enough as the 20mm fins on the old models have been increased to 30mm on the new ones. Gives an answer within engineering accuracy, given all the other uncertainties in the calcs.

Thanks for that. Does anyone have the old data sheets?

I am looking to replace some old radiators. These are Type 22, but only 80mm deep compared to modern 105mm. Does anyone have any old heat output tables which would let me see their output so that I can get the correct new size