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It seems to gradually increase over time. Goes up a bit when heating on but not much. .1 or .2 bar. I suppose a more important question is what does it matter? Is there anything wrong with living at 3 bar?

There is nothing going wrong with my system, but the pressure is regularly at 2.9 to 3.1 bar. I bled all the radiators letting the air out and the system went down to 2.6. But having come back to the house after christmas it was 2.9 again. i read that it should be between 1 - 1.5. So i...