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Water heating Kwh formula


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Hi All

does anyone know how to, or where I can find a formula to work out how much it costs to heat water in say for example a 250lt geyser with a 3kw element in 20 c ambient temperature.

I have a feeling the formula may not be as straightforward, with many factors to take into account.

Some education would be appreciated.

Many thanks in advance.

Edited by jasonvanwyk
left some info out
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1 hour ago, jasonvanwyk said:

does anyone know how to

Had to look it up again, havent done it in a long time. 

"Calculate the kilowatt-hours (kWh) required to heat the water using the following formula: Pt = (4.2 × L × T ) ÷ 3600. Pt is the power used to heat the water, in kWh. L is the number of liters of water that is being heated and T is the difference in temperature from what you started with, listed in degrees Celsius."

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