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Thanks for taking time to reading this
I’ve not come across a cylinder like this before
Oil boiler ,indirect cylinder works find but what’s going on up top please
Also there’s a bathroom radiator on the hot water side which is fine I understand that
Hope you can shed some light thanks
Looks like a prv at the back coming in but I’ve never seen a expansion vessel on a older cylinder
Early unvented ?
All the best
Not the best pic Sorry