Advice please - vented or not - will accumulator help

[billy bob]

But no qualifications, so you are a DIYer not a professional, you should not be advising anyone, as you are not qualified to do so.

I am a pro. I use the likes of you to do exactly as I say. I am the engineer, not the grunt.

Prove it, what qualifications do you hold that are relevant to the heating industry
You are simply a DIYer, and this site should remove any advice you give, you are not qualified to give advice to anyone.

Your're over re-acting.

I did not ask you