SebaV, I highly recommend the Weather Compensation Module, I was doubtful at first (couldn't understand how it actually works) but after installation it works amazingly well. So many good features of WC - rooms have constant steady temperature (no fluctuations as with room stat), even temperature through rooms (no high heat coming from radiator side), no modifying timers etc. It's a case of switch on and forget. Negative point - Mrs cannot dry clothes on radiators as they are only slightly warm all the time :). Good luck.
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