The average-size hot tub holds approximately 475 gallons of water. The earliest known hot tubs were calderas. Hot stones were used to heat the water.
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30.55 gallons (rounded) for every inch the water in the tub is deep.
Depends on how many seats, depth of the water, curvature of the corners/bottom/seats. Too many factors.
A US liquid gallon occupies 231 cubic inches. A cubic foot occupies 12" * 12" * 12" = 1728 cubic inches, so there are 1728/231 = 7.48 gallons in a cubic foot. The hot tub has a volume of 5 * 5 * 3 = 75 cubic feet. So it contains 75 * 7.48 = 561 gallons.
16.32 US gallons.16.32 US gallons.16.32 US gallons.16.32 US gallons.
A standard typical 8x8 hot tub holds between 400 and 500 liters of water. Larger hot tubs can hold around 1,500 liters of water.