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If you are outside the United States and replacing a hot tub pump — or trying to determine the correct horsepower versus amperage for a 50Hz system — you cannot rely on the standard American amp-to-horsepower chart. It does not apply. 50Hz pumps draw different amperage than 60Hz pumps, and true high-horsepower motors (4 HP, 5 HP, 6 HP class) are far less common in international markets. Most 50Hz jet pumps — even when labeled 3 HP or 4 HP — typically fall within the 7&nda …