As you can see it on this video https://www.youtube.com/watch?v=uojPHlGGB5I
the gas reulator is plugged to the boiler with a pipe which is more than 20 cm long (starting in the middle of the boiler, close to the oil separator, and the pipe makes a long syphon.
If I read my messages, I do not think I incriminate the manufacturer, who has retired besides this, I share an experience.
The possible issue is that I always keep my unused boilers empty and opened ==> there is no suction effect to remove the remaining condensaton in the pipe.
And here is a very bad installation https://www.youtube.com/watch?v=utYZJDJPBVg
, a non sense which operates quite well at this moment
I changed the title of my post because, as a neophyte, I may be confusing between electrolysis and corrosion.