A #6 aluminum conductor will limit the voltage drop to 3% or less when supplying 20 amps for 200 feet on a 240 volt system.
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A rather thin copper or aluminum wire.
2 AWG.
At the service entrance you will need AWG 1/0 gauge.
Depends on the amperage of the Jacuzzi and if it is 120 or 240 volts.
AWG # 10.