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What is this ceramic submarine looking thing under my floorboards?
I’m renovating my flat - top floor of a 3 story terraced Victorian house in Hove, UK. Pulled up the floorboards in what was a 2004 created en suite shower room (old newspapers confirm) and was greeted by this strange looking contraption. It has an earth bonding wire attached to it - I’m not sure if the other end is connected as it goes through a joist I’ve not lifted the floorboards over. Single copper pipe into one side and the same out of the other. Not sure if it’s plumbed in and has actual mains water flowing through it. Doubt it’s plumbed into the central heating. Feels like it’s made of ceramic. Outside seems almost like it’s glazed. The black cap on it seems to say “Henley” I think. Any ideas much appreciated
