Question about Eberle Controls Room Thermostat

This is a simple on/off switch. Suitable for 220V valves, as used in heating systems. But beware, this controller cannot be mounted on the usual flush-mounted boxes, even on surface-mounted boxes it is difficult because the cable bushings are very poorly arranged. I would, or have bought Feller, top product and beautiful design, unfortunately a little more expensive. I still have a few of the Eberles to give away ;-)