Will the boiler consumption decrease if we switch from one phase to three phases?

Andrew asks:
Hello. There is an electric boiler of 380 volts connected to a conventional single-phase 220 volt network. It burns up too much for electricity, it was advised to carry separately 380 volts, maybe this will even affect the economy. 9 kW boiler.
The answer to the question:
Hello! You had 9 kW, 9 kW left - is there a difference in consumption if the power is the same with a different number of phases? No. The current will decrease in each of the wires, but not only the phase and zero will be, but three phases, and the power will remain the same.
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