I saw this today and it looked to be one of the old steel compression tanks. But after closer inspection i noticed that the supply and return piping for the boiler and the system branch off of it. It also has a tapping for the make up water and a manual key bleeder on each side. My thoughts are that its a combination expansion/air separation component. or maybe a buffer tank. I didn't see any additional expansion tank anywhere on the system so I imagine that expansion is one purpose it serves. Tried finding it online but had no luck. If anyone has any experience with one of these I would love some more information. I've inuded two pictures. Thanks.
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