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Thank you very much endecotp for a thoughtful reply (and for spotting the bracket missed out in transcription!). The high ΔT comes from considering a worst case scenario - zero ambient degrees in the underfloor space and 70degC in the flow. I have sized the emitters for ΔT40 inside the...

Vulcan thanks for a thoughtful reply, which has made salient for me differences between the OP's situation and my own. I am completely with what you call 'system efficiency' - to which might be added considerations of 'system effectiveness'. The desire for the latter (or the limitations of the...

Coming to the problem fresh, I imagined that there will be a 'sweet spot' for insulation sizing for each size of pipe and for each ΔT that reflects the law of diminishing returns. Has anyone already done calculations on heat losses that can validate or refute my approach to this? Using the...

No answers available to Brentwood172's Q, or just no answers being offered here? I ask because I face a similar dilemma: 3 storey end-Tce Edwardian house, 250 sq m with some insulation (warm roof U1.8, Partial EWI, GF UF insulation, D/G sashes). 24kW heat loss at -2degC. Low occupancy (2) c...