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My weather following was reported as worse as I added more historical data, ie the fact that performance has improved over time is not really dealt with correctly IMHO!
No, that's because it's less than predicted at the given HDD, partly because our DHW demand has been dropping over time as well as our general CH demand. 12C still seems pretty much the right baseline for us.
Mine is clearly showing the impact of improved draftproofing / insulation / double glazing installed in summer 2010 - I hope I'll also see benefits from the ongoing further improvements.
As a perhaps stupid question, is Imeasure calculating this based on total (measured) energy or just gas?