How can I recognize flow and return?
Ideally, everything was marked during installation and the search is over. However, since this is almost never the case, you have to resort to other features. Recognizing flow and return is easy, because the flow is always warmer than the return. If you can’t feel the temperature difference directly, you can switch the heating on and off completely. The first line to get warm is the supply line. In addition, you can see the return flow at the expansion vessel. The expansion vessel is a small, roundish tub, which is intended to prevent damage to the system due to volume changes in the water.