Lectrician
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The 7kW one, at 230v is only a tad over 30amp. With BS7671 diversity, it's well within a 30amp circuit.
The 3kW one will cycle the elements and prevent more than one or two running at a time. While this saves current, and allows a smaller supply, the energy used will be the same. You will just use less current for longer, and your spagbol will take longer too!
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