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KW is a measure of real power (kilo watts) used. Real power is the power disippated / transformed into heat (in your instance). KVA (kilo volt amperes) is a measure of the vector total of real power and reactive power used. Reactive power is power that is stored and released be certain electrical elements such as capacitors and inductors. A heater inherently has a certain amount of inductance due to the heating wire used, which appears as an inductor to the 60Hz AC voltage applied to it. KW is a useful term because this is how much power you are using. KVA is useful, because this defines the total current draw your heater will have, so wiring and fusing need to be sized accordingly.

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