did you measure the current on both the live and neutral sides of the circuit?
No, I only measured the live side of each half of the element. I think I see where you're headed, but the shower is fed via an RCD, and the supply is TT with a EFLI of over 20 ohms, so I think that knocks out that possibility.
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I am perplexed as to where 7.5kW of energy is going.
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