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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.