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Yes there is one of course

Have a look if the new pic is more clear.. left side there is just the expansion vessel. I wish I could avoid tracing it, I am asking if neighbors can find out a plumbing system diagram :( thanks guys you are amazing, i like this forum

I don't think it is connected to something, the valve now is closed and all is functioning well, the hot water is flowing normally. A theory is that it could be some sort of pressure reducing system but there is no visible pump connected to it. The expansion vessel is on the left and the...

Hi there I recently had a problem with backfeeding of cold water in the hot water tubes, I have an unvented direct cylinder. We tried all mixers but apparently the issue was caused by the valve visible on the pic attached. We closed the valve and all seems to be working. The plumber is not sure...