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It looked as if never used, and the UK plug had no safety shields on pins, so must be quite old. It needs to be unplugged to fill one removes the handle completely, it warns too much salt and too much steam and no salt and no steam.
I put an insulation tester between line and neutral and there is an open circuit. It does seem it passes power through the water and there is no element, not dismantled it to be sure, but it does seem that's how it works.
It would seem to be an electrode water heater (554.1 old 17th Edition)
BS7671:2008 said:554.1.7 Where the electrode water heater or electrode boiler is not piped to a water supply or in physical ,contact with an earthed metal, and where the electrodes and the water in contact with the electrodes are so shielded in insulating material that they - cannot be touched while the electrodes are live, a fuse in the line conductor may be substituted for the circuit-breaker required under Regulation 554.12 and the shell of the electrode water heater or electrode boiler need not be connected to the neutral of the supply.
It seems it is allowed, however it all relies on the correct amount of salt being added which seems a little hit and miss. Marked TERSON 1979 Made in France although it seems wrong can't actually find anything that says it should not be sold.