That depends on how much water is in the spa. The specific heat of water is 4.186 joule/gramC. Since a Watt is a measure of joules per second, you just need to find out how many joules it takes to heat the quantity of water you want and then convert that figure to kwh. The water in your spa can be measured in volume, then converted to grams because water weighs one gram per mL.
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