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Being poor sucks but at the same time being poor also makes you find alternative solutions to the incredibly expensive solutions first world countries use today. I really wish Brazil can invest heavily into renewables and free itself from oil and electrify even more of everything we do.
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> electrical shower-head

Is that for electrically heated water?

I know that in the US on-demand electric water heater uses an enormous amount of electricity, like 100 amps.

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Brazilian electrical shower-heads use 20 to 30 amps max.
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At what voltage? (I understand Brazil has districts with both 127V and 220V mains.)

https://www.worldstandards.eu/electricity/plug-voltage-by-co...

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Then they don't heat same volume to same temp, it's thermodynamics
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Yes but they are also less efficient because they don't have point-of-use placement
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