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I got right down the rabbit hole on this and ended up with a Wiser by Drayton as it should stick to schedule even if the internet goes down. A lot of the others seem to need wifi to work properly.
I was also looking at one that worked properly with the right boiler protocol for controlling modulation via Opentherm but lost the will to live
Super quick one - Getting a new boiler installed next week.
Best Smart Thermostat for a combi?