I moved to an apartment in Luxembourg (which uses german-style plumbing) with a vented tap kitchen sink.
The issue I'm having is that when I close the tap after using the cold water, for a few seconds there will be scalding hot water coming.
This is becoming annoying and I thought of replacing the whole tap with a new one (same brand, same model).
However now I am starting to wonder if the issue might come from the water heater under the sink. We also have minor issues with water pressure in the kitchen - it takes a few seconds to build up even with cold water.
This is the first time I have a vented tap, I've always been used to classic hot/cold water coming from the main boiler, so I'm a bit lost.
These are the mounting instructions from the DIY shop https://youtu.be/7a3pr_HK76o?t=111