The primary difference between kW (kilowatt) and kVA (kilovolt-ampere) is the power factor.
kW is the unit of real power and kVA is a unit of apparent power (or real power plus re-active power). The power factor, unless it is defined and known, is therefore an approximate value (typically 0.8), and the kVA value will always be higher than the value for kW.
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