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A whirlpool bathtub is a bathtub that produces a whirlpool effect by jetting water. It circulates the water in the bathtub to multiple nozzles through a built-in water pump system, and then sprays it out at high pressure to produce a powerful water flow.

The jets of a whirlpool bathtub are usually located in different parts of the bathtub, covering the main parts of the body, such as the back, waist and legs. The jet function is driven by a water pump, and the water flows out of the jets at high speed, forming a water flow impact similar to massage.

Whirlpool tubs typically hold 50 to 150 gallons (about 190 to 570 liters) of water, depending on size. Small whirlpool tubs are more suitable for family bathrooms and are usually about 60 inches long, 30 inches wide, and 18 inches deep, with a capacity of between 50 and 70 gallons.

Issues with water left in a whirlpool tub: 1. Hygiene issues: risks of water being retained for a long time 2. Equipment impact: potential damage to whirlpool tubs 3. Energy consumption issues: how retained water increases energy consumption

In the United States, the National Electrical Code (NEC) requires the use of GFCI in wet environments. According to NEC Article 680, all whirlpool bathtubs installed outdoors or in wet environments must be equipped with GFCI protection.

A whirlpool is a bathtub that uses water flow to create a swirling or vortex effect. A Jacuzzi is a bathtub that uses a combination of bubbles and water flow to provide a massage effect. Its main feature is to use bubbles and water flow to massage the body in an all-round way.