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The immersion heater should be on a separate cable back to your consumer unit (fuse box) and connected by fixed wiring to the iBoost/immersion heater. (For example using a Screwfix 58085). In my opinion this should be looked at by a qualified electrician because there are potential safety issues there.
That screwfix item is a switched fused connection unit, this is the wrong thing to use if it is to be connected to a seperate circuit and is not much better than a 1363 plug as it still has a 13A fuse and is rated to only 13A.