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@Colm89
I set up a history tracker and left the heating automation running since Friday afternoon to understand what it was doing, and once the room is up to temperature the boiler switches on very little, approximately half an hour at a time every few hours. I made minor tweaks to the automation and since then temperature has been incredibly stable at 19 degrees with a programmed variance of +/- 0.2 degrees to prevent the boiler switching on and off too much. So far pretty impressed with my diy smart heating for under €100, with loads of scope for increasing the granularity in the future.
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