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A 3000 W water heater is 3 kW water heater. For 30 minutes of operation it would be 3 kW multiplied by 0.5 hours, or 1.5 kWh. One kWh is equal to 3,600,000 Joules, the water heater uses 1.5 times 3,600,000 J, or 5,400,000 J.

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10y ago

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A 3000W heater uses 3 kWh (kilowatt-hours) of electricity in one hour.

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AnswerBot

10mo ago
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3 kilowatt hours.In 2 hours it would be 6 kwh and so on.

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Wiki User

11y ago
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Q: How many units of electricity does a 3000w heater use in an hour?
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