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Hmm, could have posted bigger pics. My computer told be they were 126kb but they seem compressed better than that.
I did wonder whether it could be a part of a coal or wood burning stove which heats water in an outer jacket. It seems a complicated construction for such a device but there were things like this in the 1920s (from the internet) though they seem to be cylindrical. If it was designed to be against a wall on one side it may explain its shape.
Perhaps it is cast then. I'm rather ignorant of casting techniques; how is sand used? It must have to retain a shape (the negative of the inside) whilst the molten iron is poured but then "flow" like sand to get it out of the holes. Could that be why there are extra "ports" which are blanked off with bolted plates: so as to get the sand out after moulding?
Graham, I doubt if there even was a heat exchanger in the tank. I think the water would circulate between the tank and the back boiler. My folks had a Rayburn stove with a back boiler, and I'm pretty sure it worked that way. When my dad got a bit too ambitious with the anthracite, you could hear the tank rumbling as the steam from the back boiler got to it. It ran for at least fifty years without any problems.
Don't dump it, rather use it as a feature around the garden. Old metal lasts pretty much forever outside.