My existing Cotherm BBSC0063 thermostat has a cylindrical sensor which pushes into a tube on the side of the boiler. Wires lead from the thermostat to stop/start the Riello burner. (There is also a coiled overheating sensor, 110C). I am hopeful of something a bit more sophisticated with maybe two setting dials: one for burner start, the other for burner stop.
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