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Just reporting temperature. I don't know how accurate those things are - spec says +-0.5 C but I imagine that's systematically out by some offset?
Controlling the boiler should be easy - as I understand it the thermostat is literally just a switch that connects two nodes on the boiler which passes current when the temperature is below whatever's on the dial. I think it's 24V though so not quite as easy as just plugging something into a GPIO pin but not got that far yet.
Are you controlling the heating already? Or just reporting temperature?