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That sensor reads 12C most of the winter because it is on the windward wall which is not well sealed and the junction box has an extra unnecessary knockout. The lowest set point on the heater is 15C, so it would be heating 24/7 most of the winter. That is helemaal niet Nederlands.

A previous resident must have yanked the sensor wires out of the terminal block, breaking the terminal block as well. Better no heat than spending too much on heat!