The terms Hot Tubs, Jacuzzis and Spas are often used interchangeably. While there are certain similarities, e.g all involve water and usually therapeutic water jets, there are differences.
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A hot tub is a large tub of heated water that people often use for fun and relaxation and hydrotherapy. Generally the term is used to refer to any tub with jet and bubble features. Although many hot tubs have multiple features such as: LED lighting, electronic controls, cushioned headrests, audio systems, Bluetooth and even flat screens.
Hot tubs are usually freestanding above ground, but not exclusively. They usually have acrylic moulded shells to hold the water and dedicated plumbing and electricity supplies. However there has been a growth in cheaper inflatable hot tubs, making moving and storage very easy.
Hot tubs on average are cheaper than Jacuzzis and Spas.
Jacuzzi is a brand name and is also used as a generic term for any hydrotherapy tub just in the same way as a Hoover is used to refer to any vacuum cleaner.
The original founders of the company, two brothers called Jacuzzi, designed a pump that went over the side of a bathtub to produce a whirlpool effect. This then was developed over time into the complex hydrotherapy Jacuzzi tubs we know today.