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An ordinary bath takes 4-6 units of electric energy and it's usual to have a hot water tank with a 3 kW immersion heater, so it would not be instant for that amount of energy.

But there are instant heaters for showers because they use less energy. A power-shower runs at around 8-11 kW and if the shower takes 15 minutes that would use 2-3 units.

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Q: How much power consume by a instant geaser for a bath in units?
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