According to the instructions for use the gap is 150 mm. :)

It is a German thermostat and the connections are accordingly. If, for example, a Swiss thermostat has been installed up to now, adjustments must be made. The specified dimensions are correct and the quality seems to be good.

According to the instructions (page 2, Fig. 1), the connection for hot water is on the left and that for cold water on the right.

I have found the following information : - Control technology reliably keeps the temperature constant - SafeStop system protects against excessively hot temperatures