None. The volume measure is a litre (or liter in the US).
It is impossible to tell because the question does not give the dimensions of the hottub: 8 ft x 8 ft x 3 ft or 8 yards x 8 ft x 3 inches or some metric units, or whatever.
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I can hold 20 liters of water.
how many a quarts of water hold
Most home electrical hot water tanks will hold 40 gallons.
A 20 Gallon tank can hold up to 20 gallons of water.
a lot